AutoNation (AN) 10-Q27 Oct 232023 Q3 Quarterly reportFinancial data

Company Profile

Cover Page

Cover Page - shares	9 Months Ended
Cover Page - shares	Sep. 30, 2023	Oct. 25, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	1-13107
Entity Registrant Name	AUTONATION, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	73-1105145
Entity Address, Address Line One	200 SW 1st Avenue
Entity Address, City or Town	Fort Lauderdale
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	33301
City Area Code	954
Local Phone Number	769-6000
Title of 12(b) Security	Common stock, par value $0.01 per share
Trading Symbol	AN
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		42,520,469
Amendment Flag	false
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2023
Entity Central Index Key	0000350698
Current Fiscal Year End Date	--12-31

Unaudited Condensed Consolidate

Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2023		Dec. 31, 2022
ASSETS
Cash and cash equivalents	$ 64		$ 72.6
Receivables, net	877.3		858.8
Inventory	2,645.6		2,048.3
Other current assets	186.2		158.3
Total Current Assets	3,773.1		3,138
AUTO LOANS RECEIVABLE, net of allowance for credit losses of $47.9 million and $57.5 million, respectively	320		303.1
PROPERTY AND EQUIPMENT, net of accumulated depreciation of $2.1 billion and $1.9 billion, respectively	3,723.5		3,607.2
OPERATING LEASE ASSETS	371		323.5
GOODWILL	1,455.7	[1]	1,320.1
OTHER INTANGIBLE ASSETS, NET	931.8		837
OTHER ASSETS	665.9		530.8
Total Assets	11,241		10,059.7
LIABILITIES AND SHAREHOLDERS’ EQUITY
Vehicle floorplan payable	2,814.8		2,109.3
Accounts payable	341.6		327.6
Commercial paper	350		50
Current maturities of long-term debt	12.8		12.6
Current portion of non-recourse debt	7.2		10.7
Accrued payroll and benefits	282.7		238
Other current liabilities	722.7		657.5
Total Current Liabilities	4,531.8		3,405.7
LONG-TERM DEBT, NET OF CURRENT MATURITIES	3,579.6		3,586.9
NON-RECOURSE DEBT, NET OF CURRENT PORTION	238.9		312.9
NONCURRENT OPERATING LEASE LIABILITIES	339.3		296.9
DEFERRED INCOME TAXES	60.4		76.5
OTHER LIABILITIES	349		333
COMMITMENTS AND CONTINGENCIES (Note 14)
SHAREHOLDERS’ EQUITY:
Common stock, par value $0.01 per share; 1,500,000,000 shares authorized; 63,562,149 shares issued at September 30, 2023, and December 31, 2022, including shares held in treasury	0.6		0.6
Additional paid-in capital	18.6		3.1
Retained earnings	4,426.8		3,663.7
Treasury stock, at cost; 20,790,347 and 15,915,358 shares held, respectively	(2,304)		(1,619.6)
Total Shareholders’ Equity	2,142		2,047.8
Total Liabilities and Shareholders’ Equity	11,241		10,059.7
Trade
LIABILITIES AND SHAREHOLDERS’ EQUITY
Vehicle floorplan payable	1,358.7		946.6
Non-Trade
LIABILITIES AND SHAREHOLDERS’ EQUITY
Vehicle floorplan payable	$ 1,456.1		$ 1,162.7

[1] (1) The change in goodwill from the prior period is primarily due to the acquisition of the mobile repair and maintenance business we acquired in January 2023. Such goodwill is reflected in our Mobile Service reporting unit.

Unaudited Condensed Consolida_2

Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Billions	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
PROPERTY AND EQUIPMENT, accumulated depreciation	$ 2.1	$ 1.9
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock authorized (in shares)	1,500,000,000	1,500,000,000
Common stock issued (in shares)	63,562,149	63,562,149
Treasury stock (in shares)	20,790,347	15,915,358

Unaudited Condensed Consolida_3

Unaudited Condensed Consolidated Statements Of Income - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
TOTAL REVENUE		$ 6,892.7	$ 6,666	$ 20,181.5	$ 20,288
TOTAL COST OF SALES		5,598.1	5,353.2	16,265.2	16,304.6
TOTAL GROSS PROFIT		1,294.6	1,312.8	3,916.3	3,983.4
Selling, general, and administrative expenses		819.3	763.2	2,444.9	2,259.4
Depreciation and amortization		55.7	50.1	163.1	148.9
Other (income) expense, net		0.1	(23)	6.3	(24.5)
OPERATING INCOME		419.5	522.5	1,302	1,599.6
Non-operating income (expense) items:
Floorplan interest expense		(38.3)	(10.7)	(98.2)	(21.7)
Other interest expense		(48.8)	(33.7)	(135.9)	(97.4)
Other income (loss), net		(5)	(4.6)	4.6	(24.7)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES		327.4	473.5	1,072.5	1,455.8
Income tax provision		83.7	120.8	268.5	364.5
NET INCOME FROM CONTINUING OPERATIONS		243.7	352.7	804	1,091.3
Income (loss) from discontinued operations, net of income taxes		0	(0.1)	0.9	(0.3)
NET INCOME		$ 243.7	$ 352.6	$ 804.9	$ 1,091
BASIC EARNINGS (LOSS) PER SHARE:
Continuing operations (in dollars per share)	[1]	$ 5.59	$ 6.35	$ 17.75	$ 18.65
Discontinued operations (in dollars per share)	[1]	0	0	0.02	(0.01)
Net income (in dollars per share)	[1]	$ 5.59	$ 6.35	$ 17.77	$ 18.65
Weighted average common shares outstanding (in shares)		43.6	55.5	45.3	58.5
DILUTED EARNINGS (LOSS) PER SHARE:
Continuing operations (in dollars per share)	[1]	$ 5.54	$ 6.31	$ 17.63	$ 18.53
Discontinued operations (in dollars per share)	[1]	0	0	0.02	(0.01)
Net income (in dollars per share)	[1]	$ 5.54	$ 6.31	$ 17.65	$ 18.52
Weighted average common shares outstanding (in shares)		44	55.9	45.6	58.9
COMMON SHARES OUTSTANDING, net of treasury stock, at period end (in shares)		42.8	52.3	42.8	52.3
New vehicle
TOTAL REVENUE		$ 3,187.6	$ 2,863.9	$ 9,400.5	$ 8,606.9
TOTAL COST OF SALES		2,936.9	2,534.2	8,575.2	7,578.7
TOTAL GROSS PROFIT		250.7	329.7	825.3	1,028.2
Used vehicle
TOTAL REVENUE		2,172.1	2,401.7	6,292.7	7,494.5
TOTAL COST OF SALES		2,044.3	2,259.7	5,876.2	7,059.4
TOTAL GROSS PROFIT		127.8	142	416.5	435.1
Parts and service
TOTAL REVENUE		1,157.4	1,032.1	3,392.5	3,072.3
TOTAL COST OF SALES		611.6	553.5	1,793.1	1,650.9
TOTAL GROSS PROFIT		545.8	478.6	1,599.4	1,421.4
Finance and insurance, net
TOTAL REVENUE		369.5	360.7	1,071.4	1,092.2
TOTAL GROSS PROFIT		369.5	360.7	1,071.4	1,092.2
Other
TOTAL REVENUE		6.1	7.6	24.4	22.1
TOTAL COST OF SALES		5.3	5.8	20.7	15.6
TOTAL GROSS PROFIT		$ 0.8	$ 1.8	$ 3.7	$ 6.5

[1] (1) EPS amounts are calculated discretely and, therefore, may not add up to the total due to rounding.

Unaudited Condensed Consolida_4

Unaudited Condensed Consolidated Statement Of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock
BALANCE at period start (in shares) at Dec. 31, 2021		86,562,149
BALANCE at period start at Dec. 31, 2021	$ 2,377	$ 0.8	$ 3.2	$ 4,639.9	$ (2,266.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	362.1			362.1
Repurchases of common stock, including excise tax	(380.9)				(380.9)
Stock-based compensation expense	15.9		15.9
Shares awarded under stock-based compensation plans, net of shares withheld for taxes	(28.5)		(16.7)	(58.1)	46.3
BALANCE at period end (in shares) at Mar. 31, 2022		86,562,149
BALANCE at period end at Mar. 31, 2022	2,345.6	$ 0.8	2.4	4,943.9	(2,601.5)
BALANCE at period start (in shares) at Dec. 31, 2021		86,562,149
BALANCE at period start at Dec. 31, 2021	2,377	$ 0.8	3.2	4,639.9	(2,266.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,091
BALANCE at period end (in shares) at Sep. 30, 2022		86,562,149
BALANCE at period end at Sep. 30, 2022	2,255.2	$ 0.8	9.3	5,672.8	(3,427.7)
BALANCE at period start (in shares) at Mar. 31, 2022		86,562,149
BALANCE at period start at Mar. 31, 2022	2,345.6	$ 0.8	2.4	4,943.9	(2,601.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	376.3			376.3
Repurchases of common stock, including excise tax	(403.9)				(403.9)
Stock-based compensation expense	5.3		5.3
Shares awarded under stock-based compensation plans, net of shares withheld for taxes	1.7		(2.5)		4.2
BALANCE at period end (in shares) at Jun. 30, 2022		86,562,149
BALANCE at period end at Jun. 30, 2022	2,325	$ 0.8	5.2	5,320.2	(3,001.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	352.6			352.6
Repurchases of common stock, including excise tax	(428.2)				(428.2)
Stock-based compensation expense	5.1		5.1
Shares awarded under stock-based compensation plans, net of shares withheld for taxes	0.7		(1)		1.7
BALANCE at period end (in shares) at Sep. 30, 2022		86,562,149
BALANCE at period end at Sep. 30, 2022	2,255.2	$ 0.8	9.3	5,672.8	(3,427.7)
BALANCE at period start (in shares) at Dec. 31, 2022		63,562,149
BALANCE at period start at Dec. 31, 2022	2,047.8	$ 0.6	3.1	3,663.7	(1,619.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	288.7			288.7
Repurchases of common stock, including excise tax	(307.5)				(307.5)
Stock-based compensation expense	15.1		15.1
Shares awarded under stock-based compensation plans, net of shares withheld for taxes	(23.8)		(15.2)	(41.8)	33.2
BALANCE at period end (in shares) at Mar. 31, 2023		63,562,149
BALANCE at period end at Mar. 31, 2023	2,020.3	$ 0.6	3	3,910.6	(1,893.9)
BALANCE at period start (in shares) at Dec. 31, 2022		63,562,149
BALANCE at period start at Dec. 31, 2022	2,047.8	$ 0.6	3.1	3,663.7	(1,619.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	804.9
BALANCE at period end (in shares) at Sep. 30, 2023		63,562,149
BALANCE at period end at Sep. 30, 2023	2,142	$ 0.6	18.6	4,426.8	(2,304)
BALANCE at period start (in shares) at Mar. 31, 2023		63,562,149
BALANCE at period start at Mar. 31, 2023	2,020.3	$ 0.6	3	3,910.6	(1,893.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	272.5			272.5
Repurchases of common stock, including excise tax	(209.5)				(209.5)
Stock-based compensation expense	8.3		8.3
Shares awarded under stock-based compensation plans, net of shares withheld for taxes	0.2		(0.3)		0.5
BALANCE at period end (in shares) at Jun. 30, 2023		63,562,149
BALANCE at period end at Jun. 30, 2023	2,091.8	$ 0.6	11	4,183.1	(2,102.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	243.7			243.7
Repurchases of common stock, including excise tax	(202)				(202)
Stock-based compensation expense	8.2		8.2
Shares awarded under stock-based compensation plans, net of shares withheld for taxes	0.3		(0.6)		0.9
BALANCE at period end (in shares) at Sep. 30, 2023		63,562,149
BALANCE at period end at Sep. 30, 2023	$ 2,142	$ 0.6	$ 18.6	$ 4,426.8	$ (2,304)

Unaudited Condensed Consolida_5

Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES:
Net income	$ 804.9	$ 1,091
Adjustments to reconcile net income to net cash provided by operating activities:
(Income) loss from discontinued operations	(0.9)	0.3
Depreciation and amortization	163.1	148.9
Amortization of debt issuance costs and accretion of debt discounts	7	4.5
Stock-based compensation expense	31.6	26.3
Provision for credit losses on auto loans receivable	36	0
Deferred income tax provision	5.1	5.5
Net gain related to business/property dispositions	(1.1)	(17.1)
(Gain) loss on corporate-owned life insurance asset	(4.9)	26
Gain on sale of auto loans receivable	(8.1)	0
Other	6.2	1.1
(Increase) decrease, net of effects from business acquisitions and divestitures:
Receivables	(15.1)	80.3
Auto loans receivable, net	(112.7)	0
Inventory	(563)	(9.1)
Other assets	(108.2)	(28.6)
Increase (decrease), net of effects from business acquisitions and divestitures:
Vehicle floorplan payable - trade	412	124
Accounts payable	6.4	(52.2)
Other liabilities	104.6	42.7
Net cash provided by continuing operations	762.9	1,443.6
Net cash used in discontinued operations	(0.3)	(0.3)
Net cash provided by operating activities	762.6	1,443.3
CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Purchases of property and equipment	(286)	(236.2)
Proceeds from the disposal of assets held for sale	2.5	22.8
Cash received from business divestitures, net of cash relinquished	0	55.2
Cash used in business acquisitions, net of cash acquired	(271.1)	0
Originations of auto loans receivable acquired through third-party dealers	(110.9)	0
Collections on auto loans receivable acquired through third-party dealers	110.1	0
Proceeds from the sale of auto loans receivable	68.7	0
Deposits for investment	0	(81.6)
Other	(10.3)	(7.5)
Net cash used in continuing operations	(497)	(247.3)
Net cash used in discontinued operations	0	0
Net cash used in investing activities	(497)	(247.3)
CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES:
Repurchases of common stock	(723.2)	(1,177.4)
Proceeds from 3.85% Senior Notes due 2032	0	698.8
Net proceeds from (payments of) commercial paper	300	(340)
Proceeds from non-recourse debt	151.6	0
Payments of non-recourse debt	(232.1)	0
Payment of debt issuance costs	(6.6)	(6.6)
Net proceeds from vehicle floorplan payable - non-trade	260.4	46.4
Payments of other debt obligations	(9.4)	(8.7)
Proceeds from the exercise of stock options	1.9	3.4
Payments of tax withholdings for stock-based awards	(25.2)	(29.5)
Net cash used in continuing operations	(282.6)	(813.6)
Net cash used in discontinued operations	0	0
Net cash used in financing activities	(282.6)	(813.6)
INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	(17)	382.4
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH at beginning of period	95.4	60.6
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH at end of period	$ 78.4	$ 443

Unaudited Condensed Consolida_6

Unaudited Condensed Consolidated Statements Of Cash Flows (Parenthetical)	Sep. 30, 2023
3.85% Senior Notes Due 2032 \| Senior Notes
Percentage interest on debt instrument	3.85%

Interim Financial Statements

Interim Financial Statements	9 Months Ended
Interim Financial Statements	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interim Financial Statements	INTERIM FINANCIAL STATEMENTS Business and Basis of Presentation AutoNation, Inc., through its subsidiaries, is one of the largest automotive retailers in the United States. As of September 30, 2023, we owned and operated 354 new vehicle franchises from 253 stores located in the United States, predominantly in major metropolitan markets in the Sunbelt region. Our stores, which we believe include some of the most recognizable and well-known in our key markets, sell 34 different new vehicle brands. The core brands of new vehicles that we sell, representing approximately 88% of the new vehicles that we sold during the nine months ended September 30, 2023, are manufactured by Toyota (including Lexus), Honda, Ford, General Motors, BMW, Mercedes-Benz, Stellantis, and Volkswagen (including Audi and Porsche). As of September 30, 2023, we also owned and operated 53 AutoNation-branded collision centers, 17 AutoNation USA used vehicle stores, 4 AutoNation-branded automotive auction operations, 3 parts distribution centers, a mobile automotive repair and maintenance business, and an auto finance company. We offer a diversified range of automotive products and services, including new vehicles, used vehicles, “parts and service” (also referred to as “After-Sales”), which includes automotive repair and maintenance services as well as wholesale parts and collision businesses, and automotive “finance and insurance” products (also referred to as “Customer Financial Services”), which include vehicle service and other protection products, as well as the arranging of financing for vehicle purchases through third-party finance sources. We also offer indirect financing on certain vehicles we sell through our captive finance company. For convenience, the terms “AutoNation,” “Company,” and “we” are used to refer collectively to AutoNation, Inc. and its subsidiaries, unless otherwise required by the context. Our store and other operations are conducted by our subsidiaries. The accompanying Unaudited Condensed Consolidated Financial Statements include the accounts of AutoNation, Inc. and its subsidiaries; intercompany accounts and transactions have been eliminated. The accompanying Unaudited Condensed Consolidated Financial Statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. Additionally, operating results for interim periods are not necessarily indicative of the results that can be expected for a full year. The Unaudited Condensed Consolidated Financial Statements herein should be read in conjunction with our audited Consolidated Financial Statements and notes thereto included within our most recent Annual Report on Form 10-K. These Unaudited Condensed Consolidated Financial Statements reflect, in the opinion of management, all material adjustments (which include only normal recurring adjustments) necessary to fairly state, in all material respects, our financial position and results of operations for the periods presented.

Revenue Recognition

Revenue Recognition	9 Months Ended
Revenue Recognition	Sep. 30, 2023
Revenue Recognition [Abstract]
Revenue Recognition	REVENUE RECOGNITION Disaggregation of Revenue The significant majority of our revenue is from contracts with customers. Taxes assessed by governmental authorities that are directly imposed on revenue transactions are excluded from revenue and expenses. In the following tables, revenue is disaggregated by major lines of goods and services and timing of transfer of goods and services. The tables also include a reconciliation of the disaggregated revenue to reportable segment revenue. Three Months Ended September 30, 2023 Domestic Import Premium Luxury Corporate and other (1) Total Major Goods/Service Lines New vehicle $ 916.1 $ 1,042.5 $ 1,229.0 $ — $ 3,187.6 Used vehicle 649.1 602.4 773.1 147.5 2,172.1 Parts and service 301.7 299.6 402.4 153.7 1,157.4 Finance and insurance, net 115.6 129.1 111.5 13.3 369.5 Other 1.4 3.6 0.1 1.0 6.1 $ 1,983.9 $ 2,077.2 $ 2,516.1 $ 315.5 $ 6,892.7 Timing of Revenue Recognition Goods and services transferred at a point in time $ 1,765.2 $ 1,841.7 $ 2,175.5 $ 211.3 $ 5,993.7 Goods and services transferred over time (2) 218.7 235.5 340.6 104.2 899.0 $ 1,983.9 $ 2,077.2 $ 2,516.1 $ 315.5 $ 6,892.7 Three Months Ended September 30, 2022 Domestic Import Premium Luxury Corporate and other (1) Total Major Goods/Service Lines New vehicle $ 875.0 $ 814.1 $ 1,174.8 $ — $ 2,863.9 Used vehicle 764.3 667.4 853.0 117.0 2,401.7 Parts and service 275.8 266.2 364.5 125.6 1,032.1 Finance and insurance, net 117.1 123.1 112.5 8.0 360.7 Other 0.6 4.4 1.6 1.0 7.6 $ 2,032.8 $ 1,875.2 $ 2,506.4 $ 251.6 $ 6,666.0 Timing of Revenue Recognition Goods and services transferred at a point in time $ 1,839.4 $ 1,673.0 $ 2,199.8 $ 169.9 $ 5,882.1 Goods and services transferred over time (2) 193.4 202.2 306.6 81.7 783.9 $ 2,032.8 $ 1,875.2 $ 2,506.4 $ 251.6 $ 6,666.0 Nine Months Ended September 30, 2023 Domestic Import Premium Luxury Corporate and other (1) Total Major Goods/Service Lines New vehicle $ 2,667.1 $ 2,910.1 $ 3,823.3 $ — $ 9,400.5 Used vehicle 1,880.4 1,707.7 2,275.8 428.8 6,292.7 Parts and service 888.0 859.3 1,188.9 456.3 3,392.5 Finance and insurance, net 332.2 369.5 332.3 37.4 1,071.4 Other 2.8 17.6 1.2 2.8 24.4 $ 5,770.5 $ 5,864.2 $ 7,621.5 $ 925.3 $ 20,181.5 Timing of Revenue Recognition Goods and services transferred at a point in time $ 5,134.6 $ 5,200.1 $ 6,613.1 $ 616.7 $ 17,564.5 Goods and services transferred over time (2) 635.9 664.1 1,008.4 308.6 2,617.0 $ 5,770.5 $ 5,864.2 $ 7,621.5 $ 925.3 $ 20,181.5 Nine Months Ended September 30, 2022 Domestic Import Premium Luxury Corporate and other (1) Total Major Goods/Service Lines New vehicle $ 2,555.6 $ 2,548.1 $ 3,503.2 $ — $ 8,606.9 Used vehicle 2,374.2 2,074.6 2,673.7 372.0 7,494.5 Parts and service 820.0 788.0 1,083.4 380.9 3,072.3 Finance and insurance, net 355.7 375.2 338.1 23.2 1,092.2 Other 2.6 13.1 3.3 3.1 22.1 $ 6,108.1 $ 5,799.0 $ 7,601.7 $ 779.2 $ 20,288.0 Timing of Revenue Recognition Goods and services transferred at a point in time $ 5,538.8 $ 5,205.8 $ 6,697.5 $ 536.0 $ 17,978.1 Goods and services transferred over time (2) 569.3 593.2 904.2 243.2 2,309.9 $ 6,108.1 $ 5,799.0 $ 7,601.7 $ 779.2 $ 20,288.0 (1) “Corporate and other” is comprised of our other businesses, including AutoNation USA used vehicle stores, collision centers, parts distribution centers, auction operations, and our mobile automotive repair and maintenance business. (2) Represents revenue recognized during the period for automotive repair and maintenance services. Transaction Price Allocated to Remaining Performance Obligations We sell a vehicle maintenance program (the AutoNation Vehicle Care Program or “VCP”) under which a customer purchases a specific number of maintenance services to be redeemed at an AutoNation location over a five-year term from the date of purchase. We satisfy our performance obligations related to this program and recognize revenue as the maintenance services are rendered, since the customer benefits when we have completed the maintenance service. The following table includes estimated revenue expected to be recognized in the future related to VCP performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period: Revenue Expected to Be Recognized by Period Total Next 12 Months 13 - 36 Months 37 - 60 Months Revenue expected to be recognized on VCP contracts sold as of period end $ 106.2 $ 36.2 $ 51.6 $ 18.4 As a practical expedient, since automotive repair and maintenance services are performed within one year or less, we do not disclose estimated revenue expected to be recognized in the future for automotive repair and maintenance performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period or when we expect to recognize such revenue. Contract Assets and Liabilities When the timing of our provision of goods or services is different from the timing of payments made by our customers, we recognize either a contract asset (performance precedes contractual due date) or a contract liability (customer payment precedes performance). Contract assets primarily relate to our right to consideration for work in process not yet billed at the reporting date associated with automotive repair and maintenance services, as well as our estimate of variable consideration that has been included in the transaction price for certain finance and insurance products (retrospective commissions). These contract assets are reclassified to receivables when the right to consideration becomes unconditional. Contract liabilities primarily relate to upfront payments received from customers for the sale of VCP contracts. Our receivables from contracts with customers are included in Receivables, net, our current contract asset is included in Other Current Assets, our long-term contract asset is included in Other Assets, our current contract liability is included in Other Current Liabilities, and our long-term contract liability is included in Other Liabilities in our Unaudited Condensed Consolidated Balance Sheets. The following table provides the balances of our receivables from contracts with customers and our current and long-term contract assets and contract liabilities: September 30, 2023 December 31, 2022 Receivables from contracts with customers, net $ 629.1 $ 634.5 Contract Asset (Current) $ 22.5 $ 27.7 Contract Asset (Long-Term) $ 3.4 $ 8.6 Contract Liability (Current) $ 41.9 $ 41.8 Contract Liability (Long-Term) $ 70.0 $ 66.6 The change in the balances of our contract assets and contract liabilities primarily result from the timing differences between our performance and the customer’s payment, as well as changes in the estimated transaction price related to variable consideration for performance obligations satisfied in previous periods. The following table presents revenue recognized during the period from amounts included in the contract liability balance at the beginning of the period and adjustments to revenue related to performance obligations satisfied in previous periods: Three Months Ended Nine Months Ended 2023 2022 2023 2022 Amounts included in contract liability at the beginning of the period $ 8.5 $ 8.1 $ 26.9 $ 25.9 Performance obligations satisfied in previous periods $ 4.1 $ (0.9) $ 1.5 $ 3.8

Earnings Per Share

Earnings Per Share	9 Months Ended
Earnings Per Share	Sep. 30, 2023
Earnings Per Share [Abstract]
Earnings Per Share	EARNINGS PER SHARE Basic earnings per share (“EPS”) is computed by dividing net income by the weighted average number of common shares outstanding for the period, including vested restricted stock unit (“RSU”) awards. Diluted EPS is computed by dividing net income by the weighted average number of shares outstanding, noted above, including the dilutive effect of unvested RSU awards and stock options. The following table presents the calculation of basic and diluted EPS: Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Net income from continuing operations $ 243.7 $ 352.7 $ 804.0 $ 1,091.3 Income (loss) from discontinued operations, net of income taxes — (0.1) 0.9 (0.3) Net income $ 243.7 $ 352.6 $ 804.9 $ 1,091.0 Basic weighted average common shares outstanding 43.6 55.5 45.3 58.5 Dilutive effect of unvested RSUs and stock options 0.4 0.4 0.3 0.4 Diluted weighted average common shares outstanding 44.0 55.9 45.6 58.9 Basic EPS amounts (1) : Continuing operations $ 5.59 $ 6.35 $ 17.75 $ 18.65 Discontinued operations $ — $ — $ 0.02 $ (0.01) Net income $ 5.59 $ 6.35 $ 17.77 $ 18.65 Diluted EPS amounts (1) : Continuing operations $ 5.54 $ 6.31 $ 17.63 $ 18.53 Discontinued operations $ — $ — $ 0.02 $ (0.01) Net income $ 5.54 $ 6.31 $ 17.65 $ 18.52 (1) EPS amounts are calculated discretely and, therefore, may not add up to the total due to rounding. A summary of anti-dilutive equity instruments excluded from the computation of diluted EPS is as follows: Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Anti-dilutive equity instruments excluded from the computation of diluted EPS — 0.1 — 0.1

Receivables, Net

Receivables, Net	9 Months Ended
Receivables, Net	Sep. 30, 2023
Receivables [Abstract]
Receivables, Net	RECEIVABLES, NET The components of receivables, net of allowances for expected credit losses, are as follows: September 30, December 31, Contracts-in-transit and vehicle receivables $ 408.0 $ 441.1 Trade receivables 172.4 156.6 Manufacturer receivables 212.3 174.4 Income taxes receivable (see Note 9) 24.8 20.2 Other 61.8 68.2 879.3 860.5 Less: allowances for expected credit losses (2.0) (1.7) Receivables, net $ 877.3 $ 858.8

Auto Loans Receivable

Auto Loans Receivable	9 Months Ended
Auto Loans Receivable	Sep. 30, 2023
Receivables [Abstract]
Auto Loans Receivable	AUTO LOANS RECEIVABLE Auto loans receivable include amounts due from customers related to retail vehicle sales financed through our auto finance company (referred to as AutoNation Finance), as well as retail vehicle installment sales contracts acquired through third-party independent dealers. In September 2023, we discontinued acquiring installment sales contracts through third-party independent dealers. Auto loans receivable are presented net of an allowance for expected credit losses. Auto loans receivable represent a large group of smaller-balance homogeneous loans, which we consider to be part of one class of financing receivable and one portfolio segment for purposes of determining our allowance for expected credit losses. AutoNation Finance operating results include the interest and fee income generated by auto loans receivable less the interest expense associated with the debt issued to fund these receivables, a provision for estimated credit losses, and direct expenses, as well as gains or losses on the sale of auto loans receivable. AutoNation Finance income (loss) is included as a component of Other (Income) Expense, Net (within Operating Income). Interest income on auto loans receivable is recognized when earned based on contractual loan terms. Direct costs associated with loan originations are capitalized and amortized using the effective interest method. Auto Loans Receivable, Net The components of auto loans receivable, net of unearned discounts and allowances for expected credit losses, at September 30, 2023, and December 31, 2022, are as follows: September 30, December 31, Total auto loans receivable $ 373.6 $ 377.0 Accrued interest and fees 4.1 4.4 Deferred loan origination costs 0.7 0.5 Less: unearned discounts (10.5) (21.3) Less: allowances for expected credit losses (47.9) (57.5) Auto loans receivable, net $ 320.0 $ 303.1 Credit Quality We utilize proprietary credit scoring models to rate the risk of default for customers that apply for financing by evaluating customer credit history and certain credit application information. Our evaluation considers information such as payment history for prior or existing credit accounts, as well as application information such as income, collateral, and down payment. The scoring models yield credit program tiers that represent the relative likelihood of repayment. The assigned credit tier influences the terms of the agreement, such as the required loan-to-value ratio and interest rate. After origination, credit tier assignments by customer are generally not updated. We monitor the credit quality of the auto loans receivable on an ongoing basis and also validate the accuracy of the credit scoring models periodically. Loan performance is reviewed on a recurring basis to identify whether the assigned credit tiers adequately reflect the customers’ likelihood of repayment, and if needed, adjustments are made to the scoring models on a prospective basis. Auto Loans Receivable by Major Credit Program The following tables present auto loans receivable as of September 30, 2023, and December 31, 2022, disaggregated by major credit program tier: Fiscal Year of Origination As of September 30, 2023 2023 2022 2021 2020 2019 Prior to 2019 Total Credit Program Tier (1) : Platinum $ 70.4 $ 16.5 $ 9.2 $ 4.0 $ 4.0 $ 0.7 $ 104.8 Gold 52.8 39.8 21.0 8.2 5.8 1.2 128.8 Silver 50.4 37.4 19.2 6.3 3.9 0.6 117.8 Bronze 6.2 1.4 7.3 1.9 0.1 0.1 17.0 Copper 0.4 0.4 3.5 0.7 0.1 0.1 5.2 Total auto loans receivable $ 180.2 $ 95.5 $ 60.2 $ 21.1 $ 13.9 $ 2.7 $ 373.6 Current-period gross write-offs $ 4.5 $ 27.3 $ 12.5 $ 3.7 $ 2.1 $ 0.6 $ 50.7 Fiscal Year of Origination As of December 31, 2022 2022 2021 2020 2019 2018 Prior to 2018 Total Credit Program Tier (1) : Platinum $ 21.9 $ 12.9 $ 6.4 $ 7.4 $ 2.2 $ 0.2 $ 51.0 Gold 53.7 30.0 12.9 10.6 3.2 0.4 110.8 Silver 61.9 29.8 10.4 8.0 1.9 0.1 112.1 Bronze 41.4 17.1 7.4 3.7 1.0 0.1 70.7 Copper 19.2 8.0 2.6 1.8 0.7 0.1 32.4 Total auto loans receivable $ 198.1 $ 97.8 $ 39.7 $ 31.5 $ 9.0 $ 0.9 $ 377.0 (1) Classified based on credit grade assigned when customer was initially approved for financing. Allowance for Credit Losses The allowance for credit losses represents the net credit losses expected over the remaining contractual life of our auto loans receivable. The allowance for credit losses is determined using a vintage-level statistical model that captures the relationship between historical changes in gross losses and the lifetime loss curves by month on book, credit tiers at origination, and seasonality, adjusted for expected recoveries based on historical recovery trends. The credit loss model also incorporates reasonable and supportable forecasts about the future utilizing a forecast of a macroeconomic variable, specifically, the change in U.S. disposable personal income, which we believe is most strongly correlated to evaluating and predicting expected credit losses of our auto loans receivable. We utilize a reasonable and supportable forecast period of one year, after which we immediately revert to historical experience. We periodically consider whether the use of alternative variables would result in improved credit loss model accuracy and revise the model when appropriate. We also consider whether qualitative adjustments are necessary for factors that are not reflected in the quantitative methods but impact the measurement of estimated credit losses. Such adjustments include the expectations of the impact of recent economic trends on customer behavior. The net loss estimate is calculated by applying the loss rates developed using the methods described above to the amortized cost basis of the auto loans receivable. The change in the allowance for credit losses is recognized through an adjustment to the provision for credit losses. Rollforward of Allowance for Credit Losses The following is a rollforward of our allowance for expected credit losses for auto loans receivable for the nine months ended September 30, 2023: Nine Months Ended September 30, 2023 Balance as of beginning of year $ 57.5 Provision for credit losses 36.0 Write-offs (50.7) Recoveries (1) 21.2 Sold loans (16.1) Balance as of September 30, 2023 $ 47.9 (1) Includes proceeds from the recovery of vehicle collateral, net of costs incurred. During the three and nine months ended September 30, 2023, we sold loans with an aggregate amortized cost of $60.6 million, net of allowance for expected credit losses of $16.1 million, for cash proceeds of $68.7 million. We recorded a net gain on sale of $8.1 million pre-tax. We have no continuing involvement in the sold loans as they were sold without recourse to us for their post-sale performance. Past Due Auto Loans Receivable An account is considered delinquent if 95% of the required principal and interest payments have not been received as of the date such payments were due. All loans continue to accrue interest until repayment, write-off, or when a loan reaches 75 days past due. If payment is received after a loan has stopped accruing interest due to reaching 75 days past due, the loan will be deemed current and the accrual of interest resumes. When a write-off occurs, accrued interest is written off by reversing interest income. Payments received on nonaccrual assets are recorded using a combination of the cost recovery method and the cash basis method depending on whether the related loan has been written off. In general, accounts are written off on the last business day of the month during which the earliest of the following occurs: the receivable is 120 days or more delinquent as of the last business day of the month, the vehicle has been repossessed and liquidated, or the related vehicle has been in repossession inventory for at least 60 days. The following table presents past due auto loans receivable, as of September 30, 2023, and December 31, 2022: Age Analysis of Past-Due Auto Loans Receivable as of September 30, December 31, 31-60 Days $ 18.6 $ 13.0 61-90 Days 5.5 4.1 Greater than 90 Days 3.7 2.6 Total Past Due $ 27.8 $ 19.7 Current 345.8 357.3 Total $ 373.6 $ 377.0

Inventory And Vehicle Floorplan

Inventory And Vehicle Floorplan Payable	9 Months Ended
Inventory And Vehicle Floorplan Payable	Sep. 30, 2023
Inventory And Vehicle Floorplan Payable [Abstract]
Inventory And Vehicle Floorplan Payable	INVENTORY AND VEHICLE FLOORPLAN PAYABLE The components of inventory are as follows: September 30, December 31, New vehicles $ 1,578.7 $ 1,009.7 Used vehicles 801.0 789.1 Parts, accessories, and other 265.9 249.5 Inventory $ 2,645.6 $ 2,048.3 The components of vehicle floorplan payable are as follows: September 30, December 31, Vehicle floorplan payable - trade $ 1,358.7 $ 946.6 Vehicle floorplan payable - non-trade 1,456.1 1,162.7 Vehicle floorplan payable $ 2,814.8 $ 2,109.3 Vehicle floorplan payable-trade reflects amounts borrowed to finance the purchase of specific new and, to a lesser extent, used vehicle inventories with the corresponding manufacturers’ captive finance subsidiaries (“trade lenders”). Vehicle floorplan payable-non-trade represents amounts borrowed to finance the purchase of specific new and, to a lesser extent, used vehicle inventories with non-trade lenders, as well as amounts borrowed under our secured used vehicle floorplan facilities. Changes in vehicle floorplan payable-trade are reported as operating cash flows and changes in vehicle floorplan payable-non-trade are reported as financing cash flows in the accompanying Unaudited Condensed Consolidated Statements of Cash Flows. Our inventory costs are generally reduced by manufacturer holdbacks, incentives, floorplan assistance, and non-reimbursement-based manufacturer advertising rebates, while the related vehicle floorplan payables are reflective of the gross cost of the vehicle. The vehicle floorplan payables, as shown in the above table, may also be higher than the inventory cost due to the timing of the sale of a vehicle and payment of the related liability. Vehicle floorplan facilities are due on demand, but in the case of new vehicle inventories, are generally paid within several business days after the related vehicles are sold. Vehicle floorplan facilities are primarily collateralized by vehicle inventories and related receivables. At September 30, 2023, our new vehicle floorplan facilities utilized Prime-based and SOFR-based interest rates. Our new vehicle floorplan outstanding had a weighted-average interest rate of 7.0% at September 30, 2023, and 5.9% at December 31, 2022. As of September 30, 2023, the aggregate capacity under our new vehicle floorplan facilities to finance our new vehicle inventory was approximately $4.6 billion, of which $2.2 billion had been borrowed.

Goodwill And Intangible Assets,

Goodwill And Intangible Assets, Net	9 Months Ended
Goodwill And Intangible Assets, Net	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill And Intangible Assets, Net	GOODWILL AND INTANGIBLE ASSETS, NET Goodwill and intangible assets, net, consist of the following: September 30, December 31, Goodwill (1) $ 1,455.7 $ 1,320.1 Franchise rights - indefinite-lived $ 876.2 $ 816.2 Other intangibles 70.7 30.7 946.9 846.9 Less: accumulated amortization (15.1) (9.9) Other intangible assets, net $ 931.8 $ 837.0 (1) The change in goodwill from the prior period is primarily due to the acquisition of the mobile repair and maintenance business we acquired in January 2023. Such goodwill is reflected in our Mobile Service reporting unit. Goodwill and our franchise rights assets are tested for impairment annually as of April 30 or more frequently when events or changes in circumstances indicate that impairment may exist. Under accounting standards, we chose to make a qualitative evaluation about the likelihood of goodwill impairment for our annual impairment testing as of April 30, 2023, and we determined that it was not more likely than not that the fair values of our reporting units were less than their c arrying amounts. We elected to perform quantitative franchise rights impairment tests as of April 30, 2023, and no impairment charges resulted from these quantitative tests.

Debt

Debt	9 Months Ended
Debt	Sep. 30, 2023
Debt Disclosure [Abstract]
Debt	DEBT Non-Vehicle Long-Term Debt Non-vehicle long-term debt consisted of the following: Debt Description Maturity Date Interest Payable September 30, December 31, 3.5% Senior Notes November 15, 2024 May 15 and November 15 $ 450.0 $ 450.0 4.5% Senior Notes October 1, 2025 April 1 and October 1 450.0 450.0 3.8% Senior Notes November 15, 2027 May 15 and November 15 300.0 300.0 1.95% Senior Notes August 1, 2028 February 1 and August 1 400.0 400.0 4.75% Senior Notes June 1, 2030 June 1 and December 1 500.0 500.0 2.4% Senior Notes August 1, 2031 February 1 and August 1 450.0 450.0 3.85% Senior Notes March 1, 2032 March 1 and September 1 700.0 700.0 Revolving credit facility July 18, 2028 Monthly — — Finance leases and other debt Various dates through 2041 365.3 375.5 3,615.3 3,625.5 Less: unamortized debt discounts and debt issuance costs (22.9) (26.0) Less: current maturities (12.8) (12.6) Long-term debt, net of current maturities $ 3,579.6 $ 3,586.9 Debt Refinancing Transaction On July 18, 2023, we amended and restated our unsecured credit agreement to, among other things, (1) increase the revolving credit facility (the “facility”) commitment from $1.8 billion to $1.9 billion, (2) extend the maturity date of the facility to July 18, 2028, (3) allow for the maximum leverage ratio covenant to increase from 3.75x to 4.25x for four fiscal quarters in the event that we complete a material acquisition, and (4) replace the maximum capitalization ratio covenant with a minimum interest coverage ratio covenant. Senior Unsecured Notes and Credit Agreement The interest rates payable on our 3.5% Senior Notes, 4.5% Senior Notes, 3.8% Senior Notes, and 4.75% Senior Notes are subject to adjustment upon the occurrence of certain credit rating events as provided in the indentures for these senior unsecured notes. Under our amended and restated credit agreement, we have a $1.9 billion revolving credit facility that matures on July 18, 2028. The credit agreement also contains an accordion feature that allows us, subject to credit availability and certain other conditions, to increase the amount of the revolving credit facility, together with any added term loans, by up to $500.0 million in the aggregate. As of September 30, 2023, we had no borrowings outstanding under our revolving credit facility. We have a $200.0 million letter of credit sublimit as part of the revolving credit facility. The amount available to be borrowed under the revolving credit facility is reduced on a dollar-for-dollar basis by the cumulative amount of any outstanding letters of credit, which was $0.8 million at September 30, 2023, leaving a borrowing capacity under our credit agreement of $1.9 billion at September 30, 2023. Our revolving credit facility under our amended and restated credit agreement provides for a commitment fee on undrawn amounts ranging from 0.125% to 0.20% and interest on borrowings at SOFR plus a credit spread adjustment of 0.10% or the base rate, in each case plus an applicable margin. The applicable margin ranges from 1.125% to 1.50% for SOFR borrowings and 0.125% to 0.50% for base rate borrowings. The interest rate charged for our revolving credit facility is affected by our leverage ratio. Within the meaning of Regulation S-X, Rule 3-10, AutoNation, Inc. (the parent company) has no independent assets or operations. If guarantees of our subsidiaries were to be issued under our existing registration statement, we expect that such guarantees would be full and unconditional and joint and several, and any subsidiaries other than the guarantor subsidiaries would be minor. Other Long-Term Debt At September 30, 2023, we had finance leases and other debt obligations of $365.3 million, which are due at various dates through 2041. Commercial Paper We have a commercial paper program pursuant to which we may issue short-term, unsecured commercial paper notes on a private placement basis. On August 16, 2023, we increased the maximum aggregate principal amount that may be outstanding at any time under the commercial paper program from $1.0 billion to $1.9 billion. The interest rate for the commercial paper notes varies based on duration and market conditions. The maturities of the commercial paper notes may vary, but may not exceed 397 days from the date of issuance. Proceeds from the issuance of commercial paper notes are used to repay borrowings under the revolving credit facility, to finance acquisitions, and for strategic initiatives, working capital, capital expenditures, share repurchases, and/or other general corporate purposes. We plan to use the revolving credit facility under our credit agreement as a liquidity backstop for borrowings under the commercial paper program. A downgrade in our credit ratings could negatively impact our ability to issue, or the interest rates for, commercial paper notes. At September 30, 2023, we had $350.0 million of commercial paper notes outstanding with a weighted-average annual interest rate of 6.05% and a weighted-average remaining term of 16 days. At December 31, 2022, we had $50.0 million of commercial paper notes outstanding with a weighted-average annual interest rate of 4.30% and a weighted-average remaining term of 1 day. Non-Recourse Debt Non-recourse debt relates to auto loans receivable of our captive auto finance company funded through non-recourse funding facilities, including warehouse facilities and asset-backed term funding transactions. We have two warehouse facility agreements with certain banking institutions through wholly-owned, bankruptcy-remote, special purpose entities, primarily to finance the purchase and origination of auto loans receivable. We fund auto loans receivable through these warehouse facilities, which are secured by the eligible auto loans receivable pledged as collateral. Additionally, we have term securitizations that were put in place to provide long-term funding for certain auto loans receivable initially funded through the warehouse facilities. In these transactions, a pool of auto loans receivable is sold to a bankruptcy-remote, special purpose entity that, in turn, transfers the receivables to a special purpose securitization trust (“term securitization trust”). The term securitization trust issues asset-backed securities, secured or otherwise supported by the transferred receivables, and the proceeds from the sale of the asset-backed securities are used to finance the securitized receivables. We are required to evaluate the term securitization trusts for consolidation. We retain the servicing rights for the auto loans receivable that were funded through the term securitizations. In our capacity as servicer of the underlying auto loans receivable, we have the power to direct the activities of the trusts that most significantly impact the economic performance of the trusts. In addition, we have the obligation to absorb losses (subject to limitations) and the rights to receive any returns of the trusts, which could be significant. Accordingly, we are the primary beneficiary of the trusts and are required to consolidate them. We recognize transfers of auto loans receivable into the warehouse facilities and term securitizations (together, “non-recourse debt”) as secured borrowings, which result in recording the auto loans receivable and the related non-recourse debt on our Unaudited Condensed Consolidated Balance Sheets. The non-recourse debt is structured to legally isolate the auto loans receivable, which can only be used as collateral to settle obligations of the related non-recourse debt. The term securitization trusts and investors and the creditors of the warehouse facilities have no recourse to our assets for payment of the debt beyond the related receivables, the amounts on deposit in reserve accounts, and the restricted cash from collections on auto loans receivable. Non-recourse debt outstanding at September 30, 2023, and December 31, 2022, consisted of the following: September 30, December 31, 2022 Warehouse facilities $ 189.0 $ 181.8 Term securitization debt of consolidated VIEs 59.2 146.9 248.2 328.7 Less: unamortized debt discounts and debt issuance costs (2.1) (5.1) Less: current maturities (7.2) (10.7) Non-recourse debt, net of current maturities $ 238.9 $ 312.9 The timing of principal payments on the non-recourse debt is based on the timing of principal collections and defaults on the related auto loans receivable. The current portion of non-recourse debt represents the portion of the payments received from the auto loans receivable that are due to be distributed as principal payments on the non-recourse debt in the following period. We generally enter into warehouse facility agreements for one-year terms and typically renew the agreements annually. One of the warehouse facilities matures on October 1, 2024, and the other matures on December 17, 2023. Aggregate commitments under the warehouse facilities total $350.0 million. The term securitization debt of consolidated VIEs consists of various notes with interest rates ranging from 1.49% to 4.45% and maturity dates ranging from August 2026 to May 2028. Term securitization debt is expected to become due and be paid prior to the final legal maturities based on amortization of the auto loans receivable pledged as collateral. The term securitization agreements require certain funds to be held in restricted cash accounts to provide additional collateral for the borrowings or to be applied to make payments on the securitization debt. Restricted cash of consolidated VIEs under the various term securitization agreements totaled $4.6 million as of September 30, 2023, and $14.9 million as of December 31, 2022, and is included in Other Current Assets and Other Assets in our Unaudited Condensed Consolidated Balance Sheets. Auto loans receivable pledged to the term securitization debt of consolidated VIEs totaled $59.8 million as of September 30, 2023, and $151.4 million as of December 31, 2022.

Income Taxes

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES Income taxes receivable included in Receivables, net totaled $24.8 million at September 30, 2023 and $20.2 million at December 31, 2022. We file income tax returns in the U.S. federal jurisdiction and various states. As a matter of course, various taxing authorities, including the IRS, regularly audit us. These audits may culminate in proposed assessments which may ultimately result in our owing additional taxes. With few exceptions, we are no longer subject to U.S. federal, state, and local income tax examinations by tax authorities for years before 2018. Currently, no tax years are under examination by the IRS, and tax years from 2019 to 2021 are under examination by U.S. state jurisdictions. We believe that our tax positions comply with applicable tax law and that we have adequately provided for these matters. It is our policy to account for interest and penalties associated with income tax obligations as a component of Income Tax Provision in the accompanying Unaudited Condensed Consolidated Statements of Income.

Shareholders' Equity

Shareholders' Equity	9 Months Ended
Shareholders' Equity	Sep. 30, 2023
Stockholders' Equity Note [Abstract]
Shareholders' Equity	SHAREHOLDERS’ EQUITY A summary of shares repurchased under our stock repurchase program authorized by our Board of Directors follows: Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Shares repurchased 1.3 3.8 5.3 10.9 Aggregate purchase price (1) $ 200.0 $ 428.2 $ 712.4 $ 1,213.1 Average purchase price per share $ 155.91 $ 113.51 $ 135.38 $ 110.96 (1) Excludes excise tax accrual imposed under the Inflation Reduction Act of $2.0 million and $6.6 million for the three and nine months ended September 30, 2023, respectively. As of September 30, 2023, $472.0 million remained available under our stock repurchase limit most recently authorized by our Board of Directors. We have 5.0 million authorized shares of preferred stock, par value $0.01 per share, none of which are issued or outstanding. The Board of Directors has the authority to issue the preferred stock in one or more series and to establish the rights, preferences, and dividends of such preferred stock. A summary of shares of common stock issued in connection with the exercise of stock options follows: Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Shares issued (in actual number of shares) 7,000 16,570 37,996 71,030 Proceeds from the exercise of stock options $ 0.4 $ 0.8 $ 1.9 $ 3.4 Average exercise price per share $ 57.15 $ 48.15 $ 50.34 $ 47.94 The following table presents a summary of shares of common stock issued in connection with the settlement of RSUs, as well as shares surrendered to AutoNation to satisfy tax withholding obligations in connection with the settlement of RSUs: Three Months Ended Nine Months Ended September 30, September 30, (In actual number of shares) 2023 2022 2023 2022 Shares issued 987 1,227 531,994 775,312 Shares surrendered to AutoNation to satisfy tax withholding obligations 278 570 182,527 263,521

Acquisitions and Divestitures

Acquisitions and Divestitures	9 Months Ended
Acquisitions and Divestitures	Sep. 30, 2023
Business Combination and Asset Acquisition [Abstract]
Acquisitions and Divestitures	ACQUISITIONS AND DIVESTITURES During the nine months ended September 30, 2023, we acquired RepairSmith, a mobile solution for automotive repair and maintenance, and we also purchased seven stores. Acquisitions are included in the Unaudited Condensed Consolidated Financial Statements from the date of acquisition. The purchase price allocations for these business combinations are preliminary and subject to final adjustments, primarily related to the valuation of working capital, deferred tax assets and liabilities, and residual goodwill. We did not purchase any stores during the nine months ended September 30, 2022. The acquisitions that occurred during the nine months ended September 30, 2023, were not material to our financial condition or results of operations. Additionally, on a pro forma basis as if the results of these acquisitions had been included in our consolidated results for the entire nine month periods ended September 30, 2023 and 2022, revenue and net income would not have been materially different from our reported revenue and net income for these periods. We did not divest any stores during the nine months ended September 30, 2023. We divested three stores during the nine months ended September 30, 2022. We recognized net gains related to divestitures of $16.1 million during the nine months

Cash Flow Information

Cash Flow Information	9 Months Ended
Cash Flow Information	Sep. 30, 2023
Supplemental Cash Flow Information [Abstract]
Cash Flow Information	CASH FLOW INFORMATION Cash, Cash Equivalents, and Restricted Cash The total amounts presented on our statements of cash flows include cash, cash equivalents, and restricted cash. Restricted cash includes additional collateral for non-recourse debt borrowings and collections on auto loans receivable that are due to be distributed to non-recourse debt holders in the following period. The following table provides a reconciliation of cash and cash equivalents reported on our Unaudited Condensed Consolidated Balance Sheets to the total amounts reported on our Unaudited Condensed Consolidated Statements of Cash Flows: September 30, December 31, Cash and cash equivalents $ 64.0 $ 72.6 Restricted cash included in Other Current Assets 12.6 15.6 Restricted cash included in Other Assets 1.8 7.2 Total cash, cash equivalents, and restricted cash $ 78.4 $ 95.4 Non-Cash Investing and Financing Activities We had accrued purchases of property and equipment of $33.5 million at September 30, 2023, and $29.7 million at September 30, 2022. Nine Months Ended September 30, 2023 2022 Supplemental noncash information on adjustments to right-of-use assets, including right-of-use assets obtained in exchange for new: Operating lease liabilities $ 78.6 $ 53.2 Finance lease liabilities $ 40.3 $ 20.2 Interest and Income Taxes Paid We made interest payments, net of amounts capitalized and including interest on vehicle inventory financing, of $218.2 million during the nine months ended September 30, 2023, and $96.7 million during the nine months ended September 30, 2022. We made income tax payments, net of income tax refunds, of $267.2 million during the nine months ended September 30, 2023, and $368.0 million during the nine months ended September 30, 2022.

Financial Instruments And Fair

Financial Instruments And Fair Value Measurements	9 Months Ended
Financial Instruments And Fair Value Measurements	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Financial Instruments and Fair Value Measurements	FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTSThe fair value of a financial instrument represents the amount at which the instrument could be exchanged in a current transaction between willing parties, other than in a forced sale or liquidation. Fair value estimates are made at a specific point in time based on relevant market information about the financial instrument. These estimates are subjective in nature and involve uncertainties and matters of judgment, and therefore cannot be determined with precision. Accounting standards define fair value as the price that would be received from selling an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date. Accounting standards establish a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value and also establishes the following three levels of inputs that may be used to measure fair value: Level 1 Quoted prices (unadjusted) in active markets for identical assets or liabilities that a reporting entity can access at the measurement date Level 2 Inputs other than quoted prices in active markets for identical assets and liabilities that are observable either directly or indirectly Level 3 Unobservable inputs The following methods and assumptions were used by us in estimating fair value disclosures for financial instruments: • Cash and cash equivalents, receivables, other current assets, vehicle floorplan payable, accounts payable, other current liabilities, commercial paper, warehouse credit facilities, and variable rate debt : The amounts reported in the accompanying Unaudited Condensed Consolidated Balance Sheets approximate fair value due to their short-term nature or the existence of variable interest rates that approximate prevailing market rates. • Auto loans receivable, net : Auto loans receivable are presented net of an allowance for expected credit losses, which we believe approximates fair value. • Investments in Equity Securities: Our equity investments with readily determinable fair values are measured at fair value using Level 1 inputs. The fair value of our equity investments with readily determinable fair values totaled $13.3 million at September 30, 2023, and $15.4 million at December 31, 2022. Our equity investment that does not have a readily determinable fair value is measured using the measurement alternative as permitted by accounting standards and was recorded at cost, to be subsequently adjusted for observable price changes. The carrying amount of our equity investment without a readily determinable fair value was $56.7 million at September 30, 2023, and $56.7 million at December 31, 2022. This equity investment reflects a cumulative upward adjustment of $3.4 million based on an observable price change. We did not record any upward adjustments during the nine months ended September 30, 2023. Additionally, we have not recorded any impairments or downward adjustments to the carrying amount of this equity investment as of and for the nine months ended September 30, 2023. Investments in equity securities are reported in Other Current Assets and Other Assets in the accompanying Unaudited Condensed Consolidated Balance Sheets. Realized and unrealized gains and losses are reported in Other Income (Loss), Net (non-operating) in the Unaudited Condensed Consolidated Statements of Income and in the “Corporate and other” category of our segment information. Nine Months Ended September 30, 2023 2022 Net losses recognized during the period on equity securities $ (2.3) $ (0.1) Less: Net losses recognized during the period on equity securities sold during the period — — Unrealized losses recognized during the reporting period on equity securities still held at the reporting date $ (2.3) $ (0.1) • Fixed rate long-term debt : Our fixed rate long-term debt consists primarily of amounts outstanding under our senior unsecured notes. We estimate the fair value of our senior unsecured notes using quoted prices for the identical liability (Level 1). A summary of the aggregate carrying values and fair values of our senior unsecured notes is as follows: September 30, December 31, Carrying value $ 3,227.1 $ 3,224.0 Fair value $ 2,817.8 $ 2,803.6 Nonfinancial assets such as goodwill, other intangible assets, and long-lived assets held and used, are measured at fair value when there is an indicator of impairment and recorded at fair value only when impairment is recognized or for a business combination. The fair values less costs to sell of long-lived assets or disposal groups held for sale are assessed each reporting period they remain classified as held for sale. Subsequent changes in the held for sale long-lived asset’s or disposal group's fair value less cost to sell (increase or decrease) are reported as an adjustment to its carrying amount, except that the adjusted carrying amount cannot exceed the carrying amount of the long-lived asset or disposal group at the time it was initially classified as held for sale. The following table presents assets measured and recorded at fair value on a nonrecurring basis during the nine months ended September 30, 2023 and 2022: 2023 2022 Description Fair Value Gain/(Loss) Fair Value Gain/(Loss) Long-lived assets held and used $ — $ (2.7) $ — $ (1.0) Goodwill and Other Intangible Assets Goodwill for our reporting units and our indefinite-lived intangible assets are tested for impairment annually as of April 30 or more frequently when events or changes in circumstances indicate that impairment may exist. Our principal identifiable intangible assets are individual store rights under franchise agreements with vehicle manufacturers, which have indefinite lives. Under accounting standards, we chose to make a qualitative evaluation about the likelihood of goodwill impairment for our annual impairment testing as of April 30, 2023 and 2022, and we determined that it was not more likely than not that the fair values of our reporting units were less than their carrying amounts. We elected to perform quantitative franchise rights impairment tests as of April 30, 2023 and 2022, and no impairment charges resulted from these quantitative tests. The quantitative impairment test for franchise rights requires the comparison of the franchise rights’ estimated fair value to carrying value by store. Fair values of rights under franchise agreements are estimated using Level 3 inputs by discounting expected future cash flows of the store. The forecasted cash flows contain inherent uncertainties, including significant estimates and assumptions related to growth rates, margins, working capital requirements, capital expenditures, and cost of capital, for which we utilize certain market participant-based assumptions, using third-party industry projections, economic projections, and other marketplace data we believe to be reasonable. Long-Lived Assets and Right-of-Use Assets Fair value measurements for our long-lived assets and right-of-use assets are based on Level 3 inputs. Changes in fair value measurements are reviewed and assessed each quarter for properties classified as held for sale, or when an indicator of impairment exists for properties classified as held and used or for right-of-use assets. The valuation process is generally based on a combination of the market and replacement cost approaches. In certain cases, fair value measurements are based on pending agreements to sell the related assets. In a market approach, we use transaction prices for comparable properties that have recently been sold. These transaction prices are adjusted for factors related to a specific property. We evaluate changes in local real estate markets, and/or recent market interest or negotiations related to a specific property. In a replacement cost approach, the cost to replace a specific long-lived asset is considered, which is adjusted for depreciation from physical deterioration, as well as functional and economic obsolescence, if present and measurable. To validate the fair values determined under the valuation process noted above, we also obtain independent third-party appraisals for our properties and/or third-party brokers’ opinions of value, which are generally developed using the same valuation approaches described above, and we evaluate any recent negotiations or discussions with third-party real estate brokers related to a specific long-lived asset or market. The non-cash impairment charges related to long-lived assets held and used are included in Other (Income) Expense, Net in our Unaudited Condensed Consolidated Statements of Income and in the “Corporate and other” category of our segment information. We had assets held for sale in continuing operations of $41.6 million as of September 30, 2023, and $5.7 million as of December 31, 2022, primarily related to inventory, goodwill, and property of disposal groups held for sale, as well as property held for sale. We had no assets held for sale in discontinued operations as of September 30, 2023, and $1.1 million as of December 31, 2022, which was related to property held for sale. Assets held for sale are included in Other Current Assets in our Unaudited Condensed Consolidated Balance Sheets.

Commitments And Contingencies

Commitments And Contingencies	9 Months Ended
Commitments And Contingencies	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	COMMITMENTS AND CONTINGENCIES Legal Proceedings We are involved, and will continue to be involved, in numerous legal proceedings arising out of the conduct of our business, including litigation with customers, third-party dealers, wage and hour and other employment-related lawsuits, and actions brought by governmental authorities. Some of these lawsuits purport or may be determined to be class or collective actions and seek substantial damages or injunctive relief, or both, and some may remain unresolved for several years. We establish accruals for specific legal proceedings when it is considered probable that a loss has been incurred and the amount of the loss can be reasonably estimated. Our accruals for loss contingencies are reviewed quarterly and adjusted as additional information becomes available. We disclose the amount accrued if material or if such disclosure is necessary for our financial statements to not be misleading. If a loss is not both probable and reasonably estimable, or if an exposure to loss exists in excess of the amount accrued, we assess whether there is at least a reasonable possibility that a loss, or additional loss, may have been incurred. If there is a reasonable possibility that a loss, or additional loss, may have been incurred, we disclose the estimate of the possible loss or range of loss if it is material or a statement that such an estimate cannot be made. Our evaluation of whether a loss is reasonably possible or probable is based on our assessment and consultation with legal counsel regarding the ultimate outcome of the matter. As of September 30, 2023 and 2022, we have accrued for the potential impact of loss contingencies that are probable and reasonably estimable, and there was no indication of a reasonable possibility that a material loss, or additional material loss, may have been incurred. We do not believe that the ultimate resolution of these matters will have a material adverse effect on our results of operations, financial condition, or cash flows. However, the results of these matters cannot be predicted with certainty, and an unfavorable resolution of one or more of these matters could have a material adverse effect on our results of operations, financial condition, or cash flows. Other Matters AutoNation, acting through its subsidiaries, is the lessee under many real estate leases that provide for the use by our subsidiaries of their respective store premises. Pursuant to these leases, we agree to indemnify the lessor and other related parties from certain liabilities arising as a result of the use of the leased premises, including environmental liabilities, or a breach of the lease by the lessee. Additionally, from time to time, we enter into agreements with third parties in connection with the sale of assets or businesses in which we agree to indemnify the purchaser or related parties from certain liabilities or costs arising in connection with the assets or business. Also, in the ordinary course of business in connection with purchases or sales of goods and services, we enter into agreements that may contain indemnification provisions. In the event that an indemnification claim is asserted, our liability would be limited by the terms of the applicable agreement. From time to time, primarily in connection with dispositions of automotive stores, we assign or sublet to the store purchaser our interests in any real property leases associated with such stores. In general, we retain responsibility for the performance of certain obligations under such leases to the extent that the assignee or sublessee does not perform, whether such performance is required prior to or following the assignment or subletting of the lease. Additionally, we generally remain subject to the terms of any guarantees made by us in connection with such leases. We generally have indemnification rights against the assignee or sublessee in the event of non-performance under these leases, as well as certain defenses. We presently have no reason to believe that we will be called on to perform under any such remaining assigned leases or subleases. We estimate that lessee rental payment obligations during the remaining terms of these leases with expirations ranging from 2024 to 2034 are approximately $5 million at September 30, 2023. There can be no assurance that any performance required of us under these leases would not have a material adverse effect on our business, financial condition, and cash flows.

Business And Credit Concentrati

Business And Credit Concentrations	9 Months Ended
Business And Credit Concentrations	Sep. 30, 2023
Risks and Uncertainties [Abstract]
Business And Credit Concentrations	BUSINESS AND CREDIT CONCENTRATIONS We own and operate franchised automotive stores in the United States pursuant to franchise agreements with vehicle manufacturers. During the nine months ended September 30, 2023, approximately 63% of our total retail new vehicle unit sales was generated by our stores in Florida, Texas, and California. We are subject to a concentration of risk in the event of financial distress of or other adverse event related to a major vehicle manufacturer or related lender or supplier. The core brands of vehicles that we sell, representing approximately 88% of the new vehicles that we sold during the nine months ended September 30, 2023, are manufactured by Toyota (including Lexus), Honda, Ford, General Motors, BMW, Mercedes-Benz, Stellantis, and Volkswagen (including Audi and Porsche). Our business could be materially adversely impacted by a bankruptcy of or other adverse event related to a major vehicle manufacturer or related lender or supplier. We had receivables from manufacturers or distributors of $212.3 million at September 30, 2023, and $174.4 million at December 31, 2022. Additionally, a large portion of our contracts-in-transit included in Receivables, net, in the accompanying Unaudited Condensed Consolidated Balance Sheets, are due from automotive manufacturers’ captive finance subsidiaries, which provide financing directly to our new and used vehicle customers. Concentrations of credit risk with respect to non-manufacturer trade receivables are limited due to the wide variety of customers and markets in which our products are sold as well as their dispersion across many different geographic areas in the United States. Consequently, at September 30, 2023, we do not consider AutoNation to have any significant non-manufacturer concentrations of credit risk.

Segment Information

Segment Information	9 Months Ended
Segment Information	Sep. 30, 2023
Segment Reporting [Abstract]
Segment Information	SEGMENT INFORMATION At September 30, 2023 and 2022, we had three reportable segments: (1) Domestic, (2) Import, and (3) Premium Luxury. Our Domestic segment is comprised of retail automotive franchises that sell new vehicles manufactured by Ford, General Motors, and Stellantis. Our Import segment is comprised of retail automotive franchises that sell new vehicles manufactured primarily by Toyota, Honda, Hyundai, Subaru, and Nissan. Our Premium Luxury segment is comprised of retail automotive franchises that sell new vehicles manufactured primarily by Mercedes-Benz, BMW, Lexus, Audi, and Jaguar Land Rover. The franchises in each segment also sell used vehicles, parts and automotive repair and maintenance services, and automotive finance and insurance products. “Corporate and other” is comprised of our other businesses, including AutoNation USA used vehicle stores, collision centers, parts distribution centers, auction operations, and our mobile automotive repair and maintenance business, all of which generate revenues but do not meet the quantitative thresholds for reportable segments, as well as the results of our auto finance company, unallocated corporate overhead expenses, and other income items. The reportable segments identified above are the business activities of the Company for which discrete financial information is available and for which operating results are regularly reviewed by our chief operating decision maker to allocate resources and assess performance. Our chief operating decision maker is our Chief Executive Officer. The following table provides information on revenues from external customers and segment income of our reportable segments: Three Months Ended Nine Months Ended September 30, 2023 September 30, 2023 Domestic Import Premium Luxury Domestic Import Premium Luxury Revenues from external customers $ 1,983.9 $ 2,077.2 $ 2,516.1 $ 5,770.5 $ 5,864.2 $ 7,621.5 Segment income (1) $ 107.2 $ 164.7 $ 192.9 $ 341.5 $ 498.1 $ 641.2 Three Months Ended Nine Months Ended September 30, 2022 September 30, 2022 Domestic Import Premium Luxury Domestic Import Premium Luxury Revenues from external customers $ 2,032.8 $ 1,875.2 $ 2,506.4 $ 6,108.1 $ 5,799.0 $ 7,601.7 Segment income (1) $ 142.7 $ 180.3 $ 235.2 $ 445.2 $ 559.0 $ 722.2 (1) Segment income represents income for each of our reportable segments and is defined as operating income less floorplan interest expense. The following is a reconciliation of total segment income for reportable segments to our consolidated income from continuing operations before income taxes: Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Total segment income for reportable segments $ 464.8 $ 558.2 $ 1,480.8 $ 1,726.4 Corporate and other (83.6) (46.4) (277.0) (148.5) Other interest expense (48.8) (33.7) (135.9) (97.4) Other income (loss), net (5.0) (4.6) 4.6 (24.7) Income from continuing operations before income taxes $ 327.4 $ 473.5 $ 1,072.5 $ 1,455.8

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended						9 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Pay vs Performance Disclosure
Net income	$ 243.7	$ 272.5	$ 288.7	$ 352.6	$ 376.3	$ 362.1	$ 804.9	$ 1,091

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Sep. 30, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Interim Financial Statements (P

Interim Financial Statements (Policies)	9 Months Ended
Interim Financial Statements (Policies)	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The accompanying Unaudited Condensed Consolidated Financial Statements include the accounts of AutoNation, Inc. and its subsidiaries; intercompany accounts and transactions have been eliminated. The accompanying Unaudited Condensed Consolidated Financial Statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. Additionally, operating results for interim periods are not necessarily indicative of the results that can be expected for a full year. The Unaudited Condensed Consolidated Financial Statements herein should be read in conjunction with our audited Consolidated Financial Statements and notes thereto included within our most recent Annual Report on Form 10-K. These Unaudited Condensed Consolidated Financial Statements reflect, in the opinion of management, all material adjustments (which include only normal recurring adjustments) necessary to fairly state, in all material respects, our financial position and results of operations for the periods presented.
Use of Estimates	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. In preparing these financial statements, management has made its best estimates and judgments of certain amounts included in the financial statements. We base our estimates and judgments on historical experience and other assumptions that we believe are reasonable. However, application of these accounting policies involves the exercise of judgment and use of assumptions as to future uncertainties and, as a result, actual results could differ materially from these estimates. We periodically evaluate estimates and assumptions used in the preparation of the financial statements and make changes on a prospective basis when adjustments are necessary. Such estimates and assumptions affect, among other things, our goodwill, indefinite-lived intangible asset, and long-lived asset valuations; inventory valuation; equity investment valuation; assets held for sale; assessments of variable consideration and related constraints related to retrospective commissions; accruals for chargebacks against revenue recognized from the sale of finance and insurance products; accruals related to self-insurance programs; certain legal proceedings; assessment of the annual income tax expense; valuation of deferred income taxes and income tax contingencies; the allowance for expected credit losses; and measurement of performance-based compensation costs.
Earnings Per Share	Basic earnings per share (“EPS”) is computed by dividing net income by the weighted average number of common shares outstanding for the period, including vested restricted stock unit (“RSU”) awards. Diluted EPS is computed by dividing net income by the weighted average number of shares outstanding, noted above, including the dilutive effect of unvested RSU awards and stock options.
Allowance for Credit Losses	The allowance for credit losses represents the net credit losses expected over the remaining contractual life of our auto loans receivable. The allowance for credit losses is determined using a vintage-level statistical model that captures the relationship between historical changes in gross losses and the lifetime loss curves by month on book, credit tiers at origination, and seasonality, adjusted for expected recoveries based on historical recovery trends. The credit loss model also incorporates reasonable and supportable forecasts about the future utilizing a forecast of a macroeconomic variable, specifically, the change in U.S. disposable personal income, which we believe is most strongly correlated to evaluating and predicting expected credit losses of our auto loans receivable. We utilize a reasonable and supportable forecast period of one year, after which we immediately revert to historical experience. We periodically consider whether the use of alternative variables would result in improved credit loss model accuracy and revise the model when appropriate. We also consider whether qualitative adjustments are necessary for factors that are not reflected in the quantitative methods but impact the measurement of estimated credit losses. Such adjustments include the expectations of the impact of recent economic trends on customer behavior.
Impairment of Long-Lived Assets	Nonfinancial assets such as goodwill, other intangible assets, and long-lived assets held and used, are measured at fair value when there is an indicator of impairment and recorded at fair value only when impairment is recognized or for a business combination. The fair values less costs to sell of long-lived assets or disposal groups held for sale are assessed each reporting period they remain classified as held for sale. Subsequent changes in the held for sale long-lived asset’s or disposal group's fair value less cost to sell (increase or decrease) are reported as an adjustment to its carrying amount, except that the adjusted carrying amount cannot exceed the carrying amount of the long-lived asset or disposal group at the time it was initially classified as held for sale.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	9 Months Ended
Revenue Recognition (Tables)	Sep. 30, 2023
Revenue Recognition [Abstract]
Disaggregation of Revenue	In the following tables, revenue is disaggregated by major lines of goods and services and timing of transfer of goods and services. The tables also include a reconciliation of the disaggregated revenue to reportable segment revenue. Three Months Ended September 30, 2023 Domestic Import Premium Luxury Corporate and other (1) Total Major Goods/Service Lines New vehicle $ 916.1 $ 1,042.5 $ 1,229.0 $ — $ 3,187.6 Used vehicle 649.1 602.4 773.1 147.5 2,172.1 Parts and service 301.7 299.6 402.4 153.7 1,157.4 Finance and insurance, net 115.6 129.1 111.5 13.3 369.5 Other 1.4 3.6 0.1 1.0 6.1 $ 1,983.9 $ 2,077.2 $ 2,516.1 $ 315.5 $ 6,892.7 Timing of Revenue Recognition Goods and services transferred at a point in time $ 1,765.2 $ 1,841.7 $ 2,175.5 $ 211.3 $ 5,993.7 Goods and services transferred over time (2) 218.7 235.5 340.6 104.2 899.0 $ 1,983.9 $ 2,077.2 $ 2,516.1 $ 315.5 $ 6,892.7 Three Months Ended September 30, 2022 Domestic Import Premium Luxury Corporate and other (1) Total Major Goods/Service Lines New vehicle $ 875.0 $ 814.1 $ 1,174.8 $ — $ 2,863.9 Used vehicle 764.3 667.4 853.0 117.0 2,401.7 Parts and service 275.8 266.2 364.5 125.6 1,032.1 Finance and insurance, net 117.1 123.1 112.5 8.0 360.7 Other 0.6 4.4 1.6 1.0 7.6 $ 2,032.8 $ 1,875.2 $ 2,506.4 $ 251.6 $ 6,666.0 Timing of Revenue Recognition Goods and services transferred at a point in time $ 1,839.4 $ 1,673.0 $ 2,199.8 $ 169.9 $ 5,882.1 Goods and services transferred over time (2) 193.4 202.2 306.6 81.7 783.9 $ 2,032.8 $ 1,875.2 $ 2,506.4 $ 251.6 $ 6,666.0 Nine Months Ended September 30, 2023 Domestic Import Premium Luxury Corporate and other (1) Total Major Goods/Service Lines New vehicle $ 2,667.1 $ 2,910.1 $ 3,823.3 $ — $ 9,400.5 Used vehicle 1,880.4 1,707.7 2,275.8 428.8 6,292.7 Parts and service 888.0 859.3 1,188.9 456.3 3,392.5 Finance and insurance, net 332.2 369.5 332.3 37.4 1,071.4 Other 2.8 17.6 1.2 2.8 24.4 $ 5,770.5 $ 5,864.2 $ 7,621.5 $ 925.3 $ 20,181.5 Timing of Revenue Recognition Goods and services transferred at a point in time $ 5,134.6 $ 5,200.1 $ 6,613.1 $ 616.7 $ 17,564.5 Goods and services transferred over time (2) 635.9 664.1 1,008.4 308.6 2,617.0 $ 5,770.5 $ 5,864.2 $ 7,621.5 $ 925.3 $ 20,181.5 Nine Months Ended September 30, 2022 Domestic Import Premium Luxury Corporate and other (1) Total Major Goods/Service Lines New vehicle $ 2,555.6 $ 2,548.1 $ 3,503.2 $ — $ 8,606.9 Used vehicle 2,374.2 2,074.6 2,673.7 372.0 7,494.5 Parts and service 820.0 788.0 1,083.4 380.9 3,072.3 Finance and insurance, net 355.7 375.2 338.1 23.2 1,092.2 Other 2.6 13.1 3.3 3.1 22.1 $ 6,108.1 $ 5,799.0 $ 7,601.7 $ 779.2 $ 20,288.0 Timing of Revenue Recognition Goods and services transferred at a point in time $ 5,538.8 $ 5,205.8 $ 6,697.5 $ 536.0 $ 17,978.1 Goods and services transferred over time (2) 569.3 593.2 904.2 243.2 2,309.9 $ 6,108.1 $ 5,799.0 $ 7,601.7 $ 779.2 $ 20,288.0 (1) “Corporate and other” is comprised of our other businesses, including AutoNation USA used vehicle stores, collision centers, parts distribution centers, auction operations, and our mobile automotive repair and maintenance business. (2) Represents revenue recognized during the period for automotive repair and maintenance services.
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction	The following table includes estimated revenue expected to be recognized in the future related to VCP performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period: Revenue Expected to Be Recognized by Period Total Next 12 Months 13 - 36 Months 37 - 60 Months Revenue expected to be recognized on VCP contracts sold as of period end $ 106.2 $ 36.2 $ 51.6 $ 18.4
Receivables from Contracts with Customers, Contract Assets, and Contract Liabilities	The following table provides the balances of our receivables from contracts with customers and our current and long-term contract assets and contract liabilities: September 30, 2023 December 31, 2022 Receivables from contracts with customers, net $ 629.1 $ 634.5 Contract Asset (Current) $ 22.5 $ 27.7 Contract Asset (Long-Term) $ 3.4 $ 8.6 Contract Liability (Current) $ 41.9 $ 41.8 Contract Liability (Long-Term) $ 70.0 $ 66.6 The change in the balances of our contract assets and contract liabilities primarily result from the timing differences between our performance and the customer’s payment, as well as changes in the estimated transaction price related to variable consideration for performance obligations satisfied in previous periods. The following table presents revenue recognized during the period from amounts included in the contract liability balance at the beginning of the period and adjustments to revenue related to performance obligations satisfied in previous periods: Three Months Ended Nine Months Ended 2023 2022 2023 2022 Amounts included in contract liability at the beginning of the period $ 8.5 $ 8.1 $ 26.9 $ 25.9 Performance obligations satisfied in previous periods $ 4.1 $ (0.9) $ 1.5 $ 3.8

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
Earnings Per Share (Tables)	Sep. 30, 2023
Earnings Per Share [Abstract]
Basic and Diluted Earnings Per Share	The following table presents the calculation of basic and diluted EPS: Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Net income from continuing operations $ 243.7 $ 352.7 $ 804.0 $ 1,091.3 Income (loss) from discontinued operations, net of income taxes — (0.1) 0.9 (0.3) Net income $ 243.7 $ 352.6 $ 804.9 $ 1,091.0 Basic weighted average common shares outstanding 43.6 55.5 45.3 58.5 Dilutive effect of unvested RSUs and stock options 0.4 0.4 0.3 0.4 Diluted weighted average common shares outstanding 44.0 55.9 45.6 58.9 Basic EPS amounts (1) : Continuing operations $ 5.59 $ 6.35 $ 17.75 $ 18.65 Discontinued operations $ — $ — $ 0.02 $ (0.01) Net income $ 5.59 $ 6.35 $ 17.77 $ 18.65 Diluted EPS amounts (1) : Continuing operations $ 5.54 $ 6.31 $ 17.63 $ 18.53 Discontinued operations $ — $ — $ 0.02 $ (0.01) Net income $ 5.54 $ 6.31 $ 17.65 $ 18.52 (1) EPS amounts are calculated discretely and, therefore, may not add up to the total due to rounding.
Anti-Dilutive Equity Instruments Excluded From The Computation Of Diluted EPS	A summary of anti-dilutive equity instruments excluded from the computation of diluted EPS is as follows: Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Anti-dilutive equity instruments excluded from the computation of diluted EPS — 0.1 — 0.1

Receivables, Net (Tables)

Receivables, Net (Tables)	9 Months Ended
Receivables, Net (Tables)	Sep. 30, 2023
Receivables [Abstract]
Components Of Receivables, Net Of Allowances For Expected Credit Losses	The components of receivables, net of allowances for expected credit losses, are as follows: September 30, December 31, Contracts-in-transit and vehicle receivables $ 408.0 $ 441.1 Trade receivables 172.4 156.6 Manufacturer receivables 212.3 174.4 Income taxes receivable (see Note 9) 24.8 20.2 Other 61.8 68.2 879.3 860.5 Less: allowances for expected credit losses (2.0) (1.7) Receivables, net $ 877.3 $ 858.8

Auto Loans Receivable (Tables)

Auto Loans Receivable (Tables)	9 Months Ended
Auto Loans Receivable (Tables)	Sep. 30, 2023
Receivables [Abstract]
Auto Loans Receivable	The components of auto loans receivable, net of unearned discounts and allowances for expected credit losses, at September 30, 2023, and December 31, 2022, are as follows: September 30, December 31, Total auto loans receivable $ 373.6 $ 377.0 Accrued interest and fees 4.1 4.4 Deferred loan origination costs 0.7 0.5 Less: unearned discounts (10.5) (21.3) Less: allowances for expected credit losses (47.9) (57.5) Auto loans receivable, net $ 320.0 $ 303.1
Financing Receivable Credit Quality Indicators	The following tables present auto loans receivable as of September 30, 2023, and December 31, 2022, disaggregated by major credit program tier: Fiscal Year of Origination As of September 30, 2023 2023 2022 2021 2020 2019 Prior to 2019 Total Credit Program Tier (1) : Platinum $ 70.4 $ 16.5 $ 9.2 $ 4.0 $ 4.0 $ 0.7 $ 104.8 Gold 52.8 39.8 21.0 8.2 5.8 1.2 128.8 Silver 50.4 37.4 19.2 6.3 3.9 0.6 117.8 Bronze 6.2 1.4 7.3 1.9 0.1 0.1 17.0 Copper 0.4 0.4 3.5 0.7 0.1 0.1 5.2 Total auto loans receivable $ 180.2 $ 95.5 $ 60.2 $ 21.1 $ 13.9 $ 2.7 $ 373.6 Current-period gross write-offs $ 4.5 $ 27.3 $ 12.5 $ 3.7 $ 2.1 $ 0.6 $ 50.7 Fiscal Year of Origination As of December 31, 2022 2022 2021 2020 2019 2018 Prior to 2018 Total Credit Program Tier (1) : Platinum $ 21.9 $ 12.9 $ 6.4 $ 7.4 $ 2.2 $ 0.2 $ 51.0 Gold 53.7 30.0 12.9 10.6 3.2 0.4 110.8 Silver 61.9 29.8 10.4 8.0 1.9 0.1 112.1 Bronze 41.4 17.1 7.4 3.7 1.0 0.1 70.7 Copper 19.2 8.0 2.6 1.8 0.7 0.1 32.4 Total auto loans receivable $ 198.1 $ 97.8 $ 39.7 $ 31.5 $ 9.0 $ 0.9 $ 377.0 (1) Classified based on credit grade assigned when customer was initially approved for financing.
Financing Receivable, Allowance for Credit Loss	The following is a rollforward of our allowance for expected credit losses for auto loans receivable for the nine months ended September 30, 2023: Nine Months Ended September 30, 2023 Balance as of beginning of year $ 57.5 Provision for credit losses 36.0 Write-offs (50.7) Recoveries (1) 21.2 Sold loans (16.1) Balance as of September 30, 2023 $ 47.9 (1) Includes proceeds from the recovery of vehicle collateral, net of costs incurred.
Financing Receivable, Past Due	The following table presents past due auto loans receivable, as of September 30, 2023, and December 31, 2022: Age Analysis of Past-Due Auto Loans Receivable as of September 30, December 31, 31-60 Days $ 18.6 $ 13.0 61-90 Days 5.5 4.1 Greater than 90 Days 3.7 2.6 Total Past Due $ 27.8 $ 19.7 Current 345.8 357.3 Total $ 373.6 $ 377.0

Inventory And Vehicle Floorpl_2

Inventory And Vehicle Floorplan Payable (Tables)	9 Months Ended
Inventory And Vehicle Floorplan Payable (Tables)	Sep. 30, 2023
Inventory And Vehicle Floorplan Payable [Abstract]
Components Of Inventory	The components of inventory are as follows: September 30, December 31, New vehicles $ 1,578.7 $ 1,009.7 Used vehicles 801.0 789.1 Parts, accessories, and other 265.9 249.5 Inventory $ 2,645.6 $ 2,048.3
Components Of Vehicle Floorplan Payable	The components of vehicle floorplan payable are as follows: September 30, December 31, Vehicle floorplan payable - trade $ 1,358.7 $ 946.6 Vehicle floorplan payable - non-trade 1,456.1 1,162.7 Vehicle floorplan payable $ 2,814.8 $ 2,109.3

Goodwill And Intangible Asset_2

Goodwill And Intangible Assets, Net (Tables)	9 Months Ended
Goodwill And Intangible Assets, Net (Tables)	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill And Intangible Assets, Net	Goodwill and intangible assets, net, consist of the following: September 30, December 31, Goodwill (1) $ 1,455.7 $ 1,320.1 Franchise rights - indefinite-lived $ 876.2 $ 816.2 Other intangibles 70.7 30.7 946.9 846.9 Less: accumulated amortization (15.1) (9.9) Other intangible assets, net $ 931.8 $ 837.0 (1) The change in goodwill from the prior period is primarily due to the acquisition of the mobile repair and maintenance business we acquired in January 2023. Such goodwill is reflected in our Mobile Service reporting unit.

Debt (Tables)

Debt (Tables)	9 Months Ended
Debt (Tables)	Sep. 30, 2023
Debt Disclosure [Abstract]
Long-Term Debt	Non-vehicle long-term debt consisted of the following: Debt Description Maturity Date Interest Payable September 30, December 31, 3.5% Senior Notes November 15, 2024 May 15 and November 15 $ 450.0 $ 450.0 4.5% Senior Notes October 1, 2025 April 1 and October 1 450.0 450.0 3.8% Senior Notes November 15, 2027 May 15 and November 15 300.0 300.0 1.95% Senior Notes August 1, 2028 February 1 and August 1 400.0 400.0 4.75% Senior Notes June 1, 2030 June 1 and December 1 500.0 500.0 2.4% Senior Notes August 1, 2031 February 1 and August 1 450.0 450.0 3.85% Senior Notes March 1, 2032 March 1 and September 1 700.0 700.0 Revolving credit facility July 18, 2028 Monthly — — Finance leases and other debt Various dates through 2041 365.3 375.5 3,615.3 3,625.5 Less: unamortized debt discounts and debt issuance costs (22.9) (26.0) Less: current maturities (12.8) (12.6) Long-term debt, net of current maturities $ 3,579.6 $ 3,586.9
Schedule of non-recourse Debt	Non-recourse debt outstanding at September 30, 2023, and December 31, 2022, consisted of the following: September 30, December 31, 2022 Warehouse facilities $ 189.0 $ 181.8 Term securitization debt of consolidated VIEs 59.2 146.9 248.2 328.7 Less: unamortized debt discounts and debt issuance costs (2.1) (5.1) Less: current maturities (7.2) (10.7) Non-recourse debt, net of current maturities $ 238.9 $ 312.9

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	9 Months Ended
Shareholders' Equity (Tables)	Sep. 30, 2023
Stockholders' Equity Note [Abstract]
Shares Repurchased Under Stock Repurchase Program	A summary of shares repurchased under our stock repurchase program authorized by our Board of Directors follows: Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Shares repurchased 1.3 3.8 5.3 10.9 Aggregate purchase price (1) $ 200.0 $ 428.2 $ 712.4 $ 1,213.1 Average purchase price per share $ 155.91 $ 113.51 $ 135.38 $ 110.96 (1) Excludes excise tax accrual imposed under the Inflation Reduction Act of $2.0 million and $6.6 million for the three and nine months ended September 30, 2023, respectively.
Common Stock Issued With The Exercise Of Stock Options	A summary of shares of common stock issued in connection with the exercise of stock options follows: Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Shares issued (in actual number of shares) 7,000 16,570 37,996 71,030 Proceeds from the exercise of stock options $ 0.4 $ 0.8 $ 1.9 $ 3.4 Average exercise price per share $ 57.15 $ 48.15 $ 50.34 $ 47.94
Shares Issued And Shares Surrendered To Satisfy Tax Withholdings In Connection With Restricted Stock Units	The following table presents a summary of shares of common stock issued in connection with the settlement of RSUs, as well as shares surrendered to AutoNation to satisfy tax withholding obligations in connection with the settlement of RSUs: Three Months Ended Nine Months Ended September 30, September 30, (In actual number of shares) 2023 2022 2023 2022 Shares issued 987 1,227 531,994 775,312 Shares surrendered to AutoNation to satisfy tax withholding obligations 278 570 182,527 263,521

Cash Flow Information (Tables)

Cash Flow Information (Tables)	9 Months Ended
Cash Flow Information (Tables)	Sep. 30, 2023
Supplemental Cash Flow Information [Abstract]
Reconciliation of cash and cash equivalents	The following table provides a reconciliation of cash and cash equivalents reported on our Unaudited Condensed Consolidated Balance Sheets to the total amounts reported on our Unaudited Condensed Consolidated Statements of Cash Flows: September 30, December 31, Cash and cash equivalents $ 64.0 $ 72.6 Restricted cash included in Other Current Assets 12.6 15.6 Restricted cash included in Other Assets 1.8 7.2 Total cash, cash equivalents, and restricted cash $ 78.4 $ 95.4
Supplemental noncash information, Lessee	Nine Months Ended September 30, 2023 2022 Supplemental noncash information on adjustments to right-of-use assets, including right-of-use assets obtained in exchange for new: Operating lease liabilities $ 78.6 $ 53.2 Finance lease liabilities $ 40.3 $ 20.2

Financial Instruments And Fai_2

Financial Instruments And Fair Value Measurements (Tables)	9 Months Ended
Financial Instruments And Fair Value Measurements (Tables)	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Gains (losses) recognized related to equity investments	Nine Months Ended September 30, 2023 2022 Net losses recognized during the period on equity securities $ (2.3) $ (0.1) Less: Net losses recognized during the period on equity securities sold during the period — — Unrealized losses recognized during the reporting period on equity securities still held at the reporting date $ (2.3) $ (0.1)
Summary Of Carrying Values And Fair Values Of Fixed Rate Debt	A summary of the aggregate carrying values and fair values of our senior unsecured notes is as follows: September 30, December 31, Carrying value $ 3,227.1 $ 3,224.0 Fair value $ 2,817.8 $ 2,803.6
Assets Measured and Recorded At Fair Value On A Nonrecurring Basis	The following table presents assets measured and recorded at fair value on a nonrecurring basis during the nine months ended September 30, 2023 and 2022: 2023 2022 Description Fair Value Gain/(Loss) Fair Value Gain/(Loss) Long-lived assets held and used $ — $ (2.7) $ — $ (1.0)

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
Segment Information (Tables)	Sep. 30, 2023
Segment Reporting [Abstract]
Reportable Segment Revenues and Segment Income	The following table provides information on revenues from external customers and segment income of our reportable segments: Three Months Ended Nine Months Ended September 30, 2023 September 30, 2023 Domestic Import Premium Luxury Domestic Import Premium Luxury Revenues from external customers $ 1,983.9 $ 2,077.2 $ 2,516.1 $ 5,770.5 $ 5,864.2 $ 7,621.5 Segment income (1) $ 107.2 $ 164.7 $ 192.9 $ 341.5 $ 498.1 $ 641.2 Three Months Ended Nine Months Ended September 30, 2022 September 30, 2022 Domestic Import Premium Luxury Domestic Import Premium Luxury Revenues from external customers $ 2,032.8 $ 1,875.2 $ 2,506.4 $ 6,108.1 $ 5,799.0 $ 7,601.7 Segment income (1) $ 142.7 $ 180.3 $ 235.2 $ 445.2 $ 559.0 $ 722.2 (1) Segment income represents income for each of our reportable segments and is defined as operating income less floorplan interest expense.
Reconciliation of Segment Income	The following is a reconciliation of total segment income for reportable segments to our consolidated income from continuing operations before income taxes: Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Total segment income for reportable segments $ 464.8 $ 558.2 $ 1,480.8 $ 1,726.4 Corporate and other (83.6) (46.4) (277.0) (148.5) Other interest expense (48.8) (33.7) (135.9) (97.4) Other income (loss), net (5.0) (4.6) 4.6 (24.7) Income from continuing operations before income taxes $ 327.4 $ 473.5 $ 1,072.5 $ 1,455.8

Interim Financial Statements (D

Interim Financial Statements (Details)	9 Months Ended
Interim Financial Statements (Details)	Sep. 30, 2023 franchises store brand
Product Information [Line Items]
Owned and operated new vehicle franchises \| franchises	354
Number of brands \| brand	34
Percentage of new vehicle sales from core brands (percent)	88%
Dealerships
Product Information [Line Items]
Number of stores	253
Collision Centers
Product Information [Line Items]
Number of stores	53
AutoNation USA Stores
Product Information [Line Items]
Number of stores	17
Automotive Auction Operations
Product Information [Line Items]
Number of stores	4
Parts Distribution Centers
Product Information [Line Items]
Number of stores	3

Revenue Recognition (Disaggrega

Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenues		$ 6,892.7	$ 6,666	$ 20,181.5	$ 20,288
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues		5,993.7	5,882.1	17,564.5	17,978.1
Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	[1]	899	783.9	2,617	2,309.9
New vehicle
Disaggregation of Revenue [Line Items]
Revenues		3,187.6	2,863.9	9,400.5	8,606.9
Used vehicle
Disaggregation of Revenue [Line Items]
Revenues		2,172.1	2,401.7	6,292.7	7,494.5
Parts and service
Disaggregation of Revenue [Line Items]
Revenues		1,157.4	1,032.1	3,392.5	3,072.3
Finance and insurance, net
Disaggregation of Revenue [Line Items]
Revenues		369.5	360.7	1,071.4	1,092.2
Other
Disaggregation of Revenue [Line Items]
Revenues		6.1	7.6	24.4	22.1
Domestic
Disaggregation of Revenue [Line Items]
Revenues		1,983.9	2,032.8	5,770.5	6,108.1
Domestic \| Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues		1,765.2	1,839.4	5,134.6	5,538.8
Domestic \| Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	[1]	218.7	193.4	635.9	569.3
Domestic \| New vehicle
Disaggregation of Revenue [Line Items]
Revenues		916.1	875	2,667.1	2,555.6
Domestic \| Used vehicle
Disaggregation of Revenue [Line Items]
Revenues		649.1	764.3	1,880.4	2,374.2
Domestic \| Parts and service
Disaggregation of Revenue [Line Items]
Revenues		301.7	275.8	888	820
Domestic \| Finance and insurance, net
Disaggregation of Revenue [Line Items]
Revenues		115.6	117.1	332.2	355.7
Domestic \| Other
Disaggregation of Revenue [Line Items]
Revenues		1.4	0.6	2.8	2.6
Import
Disaggregation of Revenue [Line Items]
Revenues		2,077.2	1,875.2	5,864.2	5,799
Import \| Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues		1,841.7	1,673	5,200.1	5,205.8
Import \| Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	[1]	235.5	202.2	664.1	593.2
Import \| New vehicle
Disaggregation of Revenue [Line Items]
Revenues		1,042.5	814.1	2,910.1	2,548.1
Import \| Used vehicle
Disaggregation of Revenue [Line Items]
Revenues		602.4	667.4	1,707.7	2,074.6
Import \| Parts and service
Disaggregation of Revenue [Line Items]
Revenues		299.6	266.2	859.3	788
Import \| Finance and insurance, net
Disaggregation of Revenue [Line Items]
Revenues		129.1	123.1	369.5	375.2
Import \| Other
Disaggregation of Revenue [Line Items]
Revenues		3.6	4.4	17.6	13.1
Premium Luxury
Disaggregation of Revenue [Line Items]
Revenues		2,516.1	2,506.4	7,621.5	7,601.7
Premium Luxury \| Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues		2,175.5	2,199.8	6,613.1	6,697.5
Premium Luxury \| Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	[1]	340.6	306.6	1,008.4	904.2
Premium Luxury \| New vehicle
Disaggregation of Revenue [Line Items]
Revenues		1,229	1,174.8	3,823.3	3,503.2
Premium Luxury \| Used vehicle
Disaggregation of Revenue [Line Items]
Revenues		773.1	853	2,275.8	2,673.7
Premium Luxury \| Parts and service
Disaggregation of Revenue [Line Items]
Revenues		402.4	364.5	1,188.9	1,083.4
Premium Luxury \| Finance and insurance, net
Disaggregation of Revenue [Line Items]
Revenues		111.5	112.5	332.3	338.1
Premium Luxury \| Other
Disaggregation of Revenue [Line Items]
Revenues		0.1	1.6	1.2	3.3
Corporate and other
Disaggregation of Revenue [Line Items]
Revenues	[2]	315.5	251.6	925.3	779.2
Corporate and other \| Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	[2]	211.3	169.9	616.7	536
Corporate and other \| Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	[1],[2]	104.2	81.7	308.6	243.2
Corporate and other \| New vehicle
Disaggregation of Revenue [Line Items]
Revenues	[2]	0	0	0	0
Corporate and other \| Used vehicle
Disaggregation of Revenue [Line Items]
Revenues	[2]	147.5	117	428.8	372
Corporate and other \| Parts and service
Disaggregation of Revenue [Line Items]
Revenues	[2]	153.7	125.6	456.3	380.9
Corporate and other \| Finance and insurance, net
Disaggregation of Revenue [Line Items]
Revenues	[2]	13.3	8	37.4	23.2
Corporate and other \| Other
Disaggregation of Revenue [Line Items]
Revenues	[2]	$ 1	$ 1	$ 2.8	$ 3.1

[1] (2) Represents revenue recognized during the period for automotive repair and maintenance services. (1) “Corporate and other” is comprised of our other businesses, including AutoNation USA used vehicle stores, collision centers, parts distribution centers, auction operations, and our mobile automotive repair and maintenance business.

Revenue Recognition (Estimated

Revenue Recognition (Estimated Revenue Expected to be Recognized In the Future) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Vehicle maintenance program, contract term	5 years
Revenue expected to be recognized on VCP contracts sold as of period end	$ 106.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue expected to be recognized on VCP contracts sold as of period end	$ 36.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, expected timing of satisfaction, period	2 years
Revenue expected to be recognized on VCP contracts sold as of period end	$ 51.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, expected timing of satisfaction, period	2 years
Revenue expected to be recognized on VCP contracts sold as of period end	$ 18.4

Revenue Recognition (Contract A

Revenue Recognition (Contract Assets and Liabilities) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Revenue Recognition [Abstract]
Receivables from contracts with customers, net	$ 629.1		$ 629.1		$ 634.5
Contract Asset (Current)	22.5		22.5		27.7
Contract Asset (Long-Term)	3.4		3.4		8.6
Contract Liability (Current)	41.9		41.9		41.8
Contract Liability (Long-Term)	70		70		$ 66.6
Amounts included in contract liability at the beginning of the period	8.5	$ 8.1	26.9	$ 25.9
Performance obligations satisfied in previous periods	$ 4.1	$ (0.9)	1.5	3.8
Contract assets reclassified to receivables			$ 28.7	$ 30.5

Earnings Per Share (Basic and D

Earnings Per Share (Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended						9 Months Ended
		Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net income from continuing operations		$ 243.7			$ 352.7			$ 804	$ 1,091.3
Income (loss) from discontinued operations, net of income taxes		0			(0.1)			0.9	(0.3)
NET INCOME		$ 243.7	$ 272.5	$ 288.7	$ 352.6	$ 376.3	$ 362.1	$ 804.9	$ 1,091
Basic weighted average common shares outstanding (in shares)		43.6			55.5			45.3	58.5
Dilutive effect of unvested RSUs and stock options (in shares)		0.4			0.4			0.3	0.4
Diluted weighted average common shares outstanding (in shares)		44			55.9			45.6	58.9
Basic EPS amounts:
Continuing operations (in dollars per share)	[1]	$ 5.59			$ 6.35			$ 17.75	$ 18.65
Discontinued operations (in dollars per share)	[1]	0			0			0.02	(0.01)
Net income (in dollars per share)	[1]	5.59			6.35			17.77	18.65
Diluted EPS amounts:
Continuing operations (in dollars per share)	[1]	5.54			6.31			17.63	18.53
Discontinued operations (in dollars per share)	[1]	0			0			0.02	(0.01)
Net income (in dollars per share)	[1]	$ 5.54			$ 6.31			$ 17.65	$ 18.52

[1] (1) EPS amounts are calculated discretely and, therefore, may not add up to the total due to rounding.

Earnings Per Share (Anti-Diluti

Earnings Per Share (Anti-Dilutive Equity Instruments Excluded From The Computation Of Diluted Earnings Per Share) (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Anti-dilutive equity instruments excluded from the computation of diluted earnings per share (in shares)	0	0.1	0	0.1

Receivables, Net (Details)

Receivables, Net (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Receivables [Abstract]
Contracts-in-transit and vehicle receivables	$ 408	$ 441.1
Trade receivables	172.4	156.6
Manufacturer receivables	212.3	174.4
Income taxes receivable (see Note 9)	24.8	20.2
Other	61.8	68.2
Receivables, gross	879.3	860.5
Less: allowances for expected credit losses	(2)	(1.7)
Receivables, net	$ 877.3	$ 858.8

Auto Loans Receivable - Compone

Auto Loans Receivable - Components Of Receivables, Net Of Allowances For Expected Credit Losses (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Receivables [Abstract]
Total auto loans receivable	$ 373.6	$ 377
Accrued interest and fees	4.1	4.4
Deferred loan origination costs	0.7	0.5
Less: unearned discounts	(10.5)	(21.3)
Less: allowances for expected credit losses	(47.9)	(57.5)
Auto loans receivable, net	$ 320	$ 303.1

Auto Loans Receivable - Financi

Auto Loans Receivable - Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Auto Loans Receivable
Auto loans receivable, Originated in current year	$ 180.2	$ 198.1
Auto loans receivable, Originated in year before current year	95.5	97.8
Auto loans receivable, Originated two years before current year	60.2	39.7
Auto loans receivable, Originated three years before current year	21.1	31.5
Auto loans receivable, Originated four years before current year	13.9	9
Auto loans receivable, Originated five years or more before current year	2.7	0.9
Total auto loans receivable	373.6	377
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Current-period gross write-offs, 2023 origination	4.5
Current-period gross write-offs, 2022 origination	27.3
Current-period gross write-offs, 2021 origination	12.5
Current-period gross write-offs, 2020 origination	3.7
Current-period gross write-offs, 2019 origination	2.1
Current-period gross write-offs, Prior to 2019 origination	0.6
Current-period gross write-offs	50.7
Platinum
Auto Loans Receivable
Auto loans receivable, Originated in current year	70.4	21.9
Auto loans receivable, Originated in year before current year	16.5	12.9
Auto loans receivable, Originated two years before current year	9.2	6.4
Auto loans receivable, Originated three years before current year	4	7.4
Auto loans receivable, Originated four years before current year	4	2.2
Auto loans receivable, Originated five years or more before current year	0.7	0.2
Total auto loans receivable	104.8	51
Gold
Auto Loans Receivable
Auto loans receivable, Originated in current year	52.8	53.7
Auto loans receivable, Originated in year before current year	39.8	30
Auto loans receivable, Originated two years before current year	21	12.9
Auto loans receivable, Originated three years before current year	8.2	10.6
Auto loans receivable, Originated four years before current year	5.8	3.2
Auto loans receivable, Originated five years or more before current year	1.2	0.4
Total auto loans receivable	128.8	110.8
Silver
Auto Loans Receivable
Auto loans receivable, Originated in current year	50.4	61.9
Auto loans receivable, Originated in year before current year	37.4	29.8
Auto loans receivable, Originated two years before current year	19.2	10.4
Auto loans receivable, Originated three years before current year	6.3	8
Auto loans receivable, Originated four years before current year	3.9	1.9
Auto loans receivable, Originated five years or more before current year	0.6	0.1
Total auto loans receivable	117.8	112.1
Bronze
Auto Loans Receivable
Auto loans receivable, Originated in current year	6.2	41.4
Auto loans receivable, Originated in year before current year	1.4	17.1
Auto loans receivable, Originated two years before current year	7.3	7.4
Auto loans receivable, Originated three years before current year	1.9	3.7
Auto loans receivable, Originated four years before current year	0.1	1
Auto loans receivable, Originated five years or more before current year	0.1	0.1
Total auto loans receivable	17	70.7
Copper
Auto Loans Receivable
Auto loans receivable, Originated in current year	0.4	19.2
Auto loans receivable, Originated in year before current year	0.4	8
Auto loans receivable, Originated two years before current year	3.5	2.6
Auto loans receivable, Originated three years before current year	0.7	1.8
Auto loans receivable, Originated four years before current year	0.1	0.7
Auto loans receivable, Originated five years or more before current year	0.1	0.1
Total auto loans receivable	$ 5.2	$ 32.4

Auto Loans Receivable - Finan_2

Auto Loans Receivable - Financing Receivable, Allowance for Credit Loss (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning of year		$ 57.5
Provision for credit losses		36	$ 0
Write-offs		(50.7)
Recoveries	[1]	21.2
Sold loans		(16.1)
Balance as of September 30, 2023		47.9
Sold auto loans receivable, aggregate amortized cost		60.6
Proceeds from the sale of auto loans receivable		68.7	0
Gain on sale of auto loans receivable		$ 8.1	$ 0

[1] (1) Includes proceeds from the recovery of vehicle collateral, net of costs incurred.

Auto Loans Receivable - Finan_3

Auto Loans Receivable - Financing Receivable, Past Due (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Total auto loans receivable	$ 373.6	$ 377
Total Past Due
Financing Receivable, Past Due [Line Items]
Total auto loans receivable	27.8	19.7
31-60 Days
Financing Receivable, Past Due [Line Items]
Total auto loans receivable	18.6	13
61-90 Days
Financing Receivable, Past Due [Line Items]
Total auto loans receivable	5.5	4.1
Greater than 90 Days
Financing Receivable, Past Due [Line Items]
Total auto loans receivable	3.7	2.6
Current
Financing Receivable, Past Due [Line Items]
Total auto loans receivable	$ 345.8	$ 357.3

Inventory And Vehicle Floorpl_3

Inventory And Vehicle Floorplan Payable (Components Of Inventory) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Inventory [Line Items]
Inventory	$ 2,645.6	$ 2,048.3
New vehicle
Inventory [Line Items]
Inventory	1,578.7	1,009.7
Used vehicle
Inventory [Line Items]
Inventory	801	789.1
Parts and service
Inventory [Line Items]
Inventory	$ 265.9	$ 249.5

Inventory And Vehicle Floorpl_4

Inventory And Vehicle Floorplan Payable (Components Of Vehicle Floorplan Payable) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Floorplan Payable [Line Items]
Vehicle floorplan payable	$ 2,814.8	$ 2,109.3
Trade
Floorplan Payable [Line Items]
Vehicle floorplan payable	1,358.7	946.6
Non-Trade
Floorplan Payable [Line Items]
Vehicle floorplan payable	$ 1,456.1	$ 1,162.7

Inventory And Vehicle Floorpl_5

Inventory And Vehicle Floorplan Payable (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Floorplan Payable [Line Items]
Vehicle floorplan facilities, amount outstanding	$ 2,814.8	$ 2,109.3
Used vehicle floorplan facilities, remaining borrowing capacity	184.3
Used vehicle floorplan facilities, current borrowing capacity	$ 0.3
New Vehicle Floorplan Facilities
Floorplan Payable [Line Items]
Vehicle floorplan facilities, weighted-average interest rate (percent)	7%	5.90%
Vehicle floorplan facilities, maximum borrowing capacity	$ 4,600
Vehicle floorplan facilities, amount outstanding	$ 2,200
Used Vehicle Floorplan Facilities
Floorplan Payable [Line Items]
Vehicle floorplan facilities, weighted-average interest rate (percent)	7%	5.90%
Vehicle floorplan facilities, maximum borrowing capacity	$ 775.6
Vehicle floorplan facilities, amount outstanding	$ 591.3

Goodwill And Intangible Asset_3

Goodwill And Intangible Assets, Net (Details) - USD ($) $ in Millions	Sep. 30, 2023		Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 1,455.7	[1]	$ 1,320.1
Franchise rights - indefinite-lived	876.2		816.2
Other intangibles	70.7		30.7
Other intangible assets, gross	946.9		846.9
Less: accumulated amortization	(15.1)		(9.9)
Other intangible assets, net	$ 931.8		$ 837

[1] (1) The change in goodwill from the prior period is primarily due to the acquisition of the mobile repair and maintenance business we acquired in January 2023. Such goodwill is reflected in our Mobile Service reporting unit.

Debt (Long-Term Debt) (Details)

Debt (Long-Term Debt) (Details) - USD ($) $ in Millions	2 Months Ended	9 Months Ended
Debt (Long-Term Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022
Less: current maturities	$ (12.8)	$ (12.8)	$ (12.6)
Long-term debt, net of current maturities	3,579.6	3,579.6	3,586.9
Recourse
Long-term debt	3,615.3	3,615.3	3,625.5
Less: unamortized debt discounts and debt issuance costs	(22.9)	(22.9)	(26)
Less: current maturities	(12.8)	(12.8)	(12.6)
Long-term debt, net of current maturities	$ 3,579.6	$ 3,579.6	3,586.9
3.5% Senior Notes \| Senior Notes \| Recourse
Percentage interest on debt instrument	3.50%	3.50%
Maturity date		Nov. 15, 2024
Senior notes	$ 450	$ 450	450
4.5% Senior Notes \| Senior Notes \| Recourse
Percentage interest on debt instrument	4.50%	4.50%
Maturity date		Oct. 01, 2025
Senior notes	$ 450	$ 450	450
3.8% Senior Notes \| Senior Notes \| Recourse
Percentage interest on debt instrument	3.80%	3.80%
Maturity date		Nov. 15, 2027
Senior notes	$ 300	$ 300	300
1.95% Senior Notes \| Senior Notes \| Recourse
Percentage interest on debt instrument	1.95%	1.95%
Maturity date		Aug. 01, 2028
Senior notes	$ 400	$ 400	400
4.75% Senior Notes \| Senior Notes \| Recourse
Percentage interest on debt instrument	4.75%	4.75%
Maturity date		Jun. 01, 2030
Senior notes	$ 500	$ 500	500
2.4% Senior Notes \| Senior Notes \| Recourse
Percentage interest on debt instrument	2.40%	2.40%
Maturity date		Aug. 01, 2031
Senior notes	$ 450	$ 450	450
3.85% Senior Notes \| Senior Notes
Percentage interest on debt instrument	3.85%	3.85%
3.85% Senior Notes \| Senior Notes \| Recourse
Percentage interest on debt instrument	3.85%	3.85%
Maturity date		Mar. 01, 2032
Senior notes	$ 700	$ 700	700
Revolving Credit Facility Due 2028 \| Recourse
Revolving credit facility	$ 0	$ 0
Revolving Credit Facility Due 2028 \| Line of Credit \| Recourse
Maturity date	Jul. 18, 2028	Jul. 18, 2028
Revolving Credit Facility Due 2025 \| Recourse
Revolving credit facility			0
Other Debt \| Recourse
Finance leases and other debt	$ 365.3	$ 365.3	$ 375.5

Long-Term Debt And Commercial P

Long-Term Debt And Commercial Paper (Narrative) (Details) $ in Millions	2 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Aug. 16, 2023 USD ($)	Jul. 18, 2023 USD ($)
Debt Instrument [Line Items]
Letters of credit, amount outstanding	$ 0.8	$ 0.8
Commercial paper, maximum aggregate amount outstanding permitted	1,900	1,900		$ 1,000
Commercial paper, amount outstanding	$ 350	$ 350	$ 50
Commercial Paper
Debt Instrument [Line Items]
Weighted-average annual interest rate	6.05%	6.05%	4.30%
Maximum \| Commercial Paper
Debt Instrument [Line Items]
Maturity period of debt		397 days
Weighted Average \| Commercial Paper
Debt Instrument [Line Items]
Maturity period of debt		16 days	1 day
Revolving Credit Facility Due 2025
Debt Instrument [Line Items]
Maximum borrowing capacity under revolving credit facility					$ 1,800
Debt Instrument Covenant Terms Maximum Leverage Ratio					3.75
Revolving Credit Facility Due 2025 \| Recourse
Debt Instrument [Line Items]
Revolving credit facility, amount outstanding			$ 0
Revolving Credit Facility Due 2028
Debt Instrument [Line Items]
Maximum borrowing capacity under revolving credit facility	$ 1,900	$ 1,900			$ 1,900
Debt Instrument Covenant Terms Maximum Leverage Ratio					4.25
Additional borrowing capacity under accordion feature of revolving credit facility	500	500
Revolving credit facilities letter of credit sublimit	200	200
Additional borrowing capacity under the revolving credit facility	1,900	1,900
Revolving Credit Facility Due 2028 \| Recourse
Debt Instrument [Line Items]
Revolving credit facility, amount outstanding	$ 0	0
Revolving Credit Facility Due 2028 \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Credit spread adjustment on SOFR borrowings under our revolving credit facility	0.10%
Revolving Credit Facility Due 2028 \| Minimum
Debt Instrument [Line Items]
Commitment fee on undrawn amounts (percent)	0.125%
Revolving Credit Facility Due 2028 \| Maximum
Debt Instrument [Line Items]
Commitment fee on undrawn amounts (percent)	0.20%
Other Debt \| Recourse
Debt Instrument [Line Items]
Finance leases and other debt obligations included in long-term debt	$ 365.3	$ 365.3	$ 375.5
Line of Credit \| Revolving Credit Facility Due 2028 \| Recourse
Debt Instrument [Line Items]
Maturity date	Jul. 18, 2028	Jul. 18, 2028
Line of Credit \| Revolving Credit Facility Due 2028 \| Minimum \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable interest rates (percent)	1.125%
Line of Credit \| Revolving Credit Facility Due 2028 \| Minimum \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable interest rates (percent)	0.125%
Line of Credit \| Revolving Credit Facility Due 2028 \| Maximum \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable interest rates (percent)	1.50%
Line of Credit \| Revolving Credit Facility Due 2028 \| Maximum \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable interest rates (percent)	0.50%

Debt (Non-Recourse Debt) (Detai

Debt (Non-Recourse Debt) (Details) - USD ($) $ in Millions	9 Months Ended
Debt (Non-Recourse Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Less: current maturities	$ (7.2)	$ (10.7)
Non-recourse debt, net of current maturities	238.9	312.9
Restricted cash included in Other Current Assets	12.6	15.6
Auto loans receivable	373.6	377
Variable Interest Entity, Primary Beneficiary \| Asset Pledged as Collateral
Debt Instrument [Line Items]
Restricted cash included in Other Current Assets	4.6	14.9
Auto loans receivable	59.8	151.4
Nonrecourse
Debt Instrument [Line Items]
Non Recourse Debt	248.2	328.7
Less: unamortized debt discounts and debt issuance costs	(2.1)	(5.1)
Less: current maturities	(7.2)	(10.7)
Non-recourse debt, net of current maturities	238.9	312.9
Warehouse Facilities \| Nonrecourse
Debt Instrument [Line Items]
Non Recourse Debt	189	181.8
Warehouse Facilities Maximum Borrowing Capacity	$ 350
Warehouse Facility One [Member] \| Nonrecourse
Debt Instrument [Line Items]
Maturity date	Oct. 01, 2024
Warehouse Facility Two [Member] \| Nonrecourse
Debt Instrument [Line Items]
Maturity date	Dec. 17, 2023
Term securitization debt \| Nonrecourse \| Variable Interest Entity, Primary Beneficiary
Debt Instrument [Line Items]
Non Recourse Debt	$ 59.2	$ 146.9
Term securitization debt \| Minimum \| Nonrecourse \| Variable Interest Entity, Primary Beneficiary
Debt Instrument [Line Items]
Percentage interest on debt instrument	1.49%
Term securitization debt \| Maximum \| Nonrecourse \| Variable Interest Entity, Primary Beneficiary
Debt Instrument [Line Items]
Percentage interest on debt instrument	4.45%

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income taxes receivable	$ 24.8	$ 20.2

Shareholders' Equity (Shares Re

Shareholders' Equity (Shares Repurchased Under Stock Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								9 Months Ended
	Sep. 30, 2023		Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022		Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Class of Stock [Line Items]
Aggregate purchase price	$ 202		$ 209.5	$ 307.5	$ 428.2		$ 403.9	$ 380.9
Excise tax accrual on share repurchases	$ 2								$ 6.6
Stock Repurchase Program Board Authorized Repurchases
Class of Stock [Line Items]
Shares repurchased (in shares)	1.3				3.8				5.3	10.9
Aggregate purchase price	$ 200	[1]			$ 428.2	[1]			$ 712.4	$ 1,213.1
Average purchase price per share (in dollars per share)	$ 155.91				$ 113.51				$ 135.38	$ 110.96
Remaining amount available for share repurchase	$ 472								$ 472

[1] (1) Excludes excise tax accrual imposed under the Inflation Reduction Act of $2.0 million and $6.6 million for the three and nine months ended September 30, 2023, respectively.

Shareholders' Equity (Preferred

Shareholders' Equity (Preferred Stock) (Details)	Sep. 30, 2023 $ / shares shares
Equity [Abstract]
Preferred stock authorized (in shares)	5,000,000
Preferred stock, par value (in dollars per share) \| $ / shares	$ 0.01
Preferred stock issued (in shares)	0

Shareholders' Equity (Common St

Shareholders' Equity (Common Stock Issued With The Exercise Of Stock Options) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Stockholders' Equity Note [Abstract]
Shares issued (in actual number of shares)	7,000	16,570	37,996	71,030
Proceeds from the exercise of stock options	$ 0.4	$ 0.8	$ 1.9	$ 3.4
Average exercise price per share (in dollars per share)	$ 57.15	$ 48.15	$ 50.34	$ 47.94

Shareholders' Equity (Shares Is

Shareholders' Equity (Shares Issued And Shares Surrendered To Satisfy Tax Withholdings In Connection With Restricted Stock Units) (Details) - Restricted Stock Units (RSUs) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued (in shares)	987	1,227	531,994	775,312
Shares surrendered to AutoNation to satisfy tax withholding obligations (in shares)	278	570	182,527	263,521

Acquisitions and Divestitures (

Acquisitions and Divestitures (Details) $ in Millions	9 Months Ended
Acquisitions and Divestitures (Details) $ in Millions	Sep. 30, 2023 store	Sep. 30, 2022 USD ($) store
Business Acquisition [Line Items]
Gain on disposal \| $		$ 16.1
Dealerships Divested
Business Acquisition [Line Items]
Number of businesses divested		3
Dealerships
Business Acquisition [Line Items]
Number of businesses acquired	7

Cash Flow Information (Details)

Cash Flow Information (Details) - USD ($) $ in Millions	9 Months Ended
Cash Flow Information (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents	$ 64		$ 72.6
Restricted cash included in Other Current Assets	12.6		15.6
Restricted cash included in Other Assets	1.8		7.2
Total cash, cash equivalents, and restricted cash	78.4	$ 443	$ 95.4	$ 60.6
Accrued purchases of property and equipment	33.5	29.7
Adjustments to right-of use assets including right-of-use assets obtained in exchange for new operating lease liabilities	78.6	53.2
Adjustments to right-of use assets including right-of-use assets obtained in exchange for new finance lease liabilities	40.3	20.2
Interest payments, net of amounts capitalized and including interest on vehicle inventory financing	218.2	96.7
Income tax payments, net of income tax refunds	$ 267.2	$ 368

Financial Instruments And Fai_3

Financial Instruments And Fair Value Measurements (Summary Of Carrying Values And Fair Values Of Fixed Rate Debt) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity investments with readily determinable fair values	$ 13.3		$ 15.4
Equity investment without readily determinable fair value	56.7		56.7
Net losses recognized during the period on equity securities	(2.3)	$ (0.1)
Less: Net losses recognized during the period on equity securities sold during the period	0	0
Unrealized losses recognized during the reporting period on equity securities still held at the reporting date	(2.3)	$ (0.1)
Carrying value \| Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed rate debt	3,227.1		3,224
Fair value \| Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed rate debt	2,817.8		$ 2,803.6
Nonrecurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment in equity securities without readily determinable fair values, cumulative upward adjustment	$ 3.4

Financial Instruments And Fai_4

Financial Instruments And Fair Value Measurements (Assets Measured on a Nonrecurring Basis) (Details) - Nonrecurring Basis - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain/(Loss) on assets held and used	$ (2.7)	$ (1)
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived assets held and used	$ 0	$ 0

Financial Instruments and Fai_5

Financial Instruments and Fair Value Measurements (Narrative) (Details) - Carrying value - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Continuing Operations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held for sale	$ 41.6	$ 5.7
Discontinued Operations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held for sale in discontinued operations	$ 0	$ 1.1

Commitments And Contingencies (

Commitments And Contingencies (Details) $ in Millions	Sep. 30, 2023 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Guarantor obligations, maximum exposure	$ 5
Total surety bonds, letters of credit, and cash deposits	111.5
Letters of credit, amount outstanding	$ 0.8

Business And Credit Concentra_2

Business And Credit Concentrations (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Risks and Uncertainties [Abstract]
Percentage of total retail new vehicle unit sales from stores located in Florida, Texas and California	63%
Percentage of new vehicle sales from core brands (percent)	88%
Manufacturer receivables	$ 212.3	$ 174.4

Segment Information (Revenues a

Segment Information (Revenues and Segment Income) (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) segments	Sep. 30, 2022 USD ($) segments
Segment Reporting [Abstract]
Number of reportable segments \| segments				3	3
Segment Reporting Information [Line Items]
Revenues		$ 6,892.7	$ 6,666	$ 20,181.5	$ 20,288
Segment income	[1]	464.8	558.2	1,480.8	1,726.4
Domestic
Segment Reporting Information [Line Items]
Revenues		1,983.9	2,032.8	5,770.5	6,108.1
Segment income	[1]	107.2	142.7	341.5	445.2
Import
Segment Reporting Information [Line Items]
Revenues		2,077.2	1,875.2	5,864.2	5,799
Segment income	[1]	164.7	180.3	498.1	559
Premium Luxury
Segment Reporting Information [Line Items]
Revenues		2,516.1	2,506.4	7,621.5	7,601.7
Segment income	[1]	$ 192.9	$ 235.2	$ 641.2	$ 722.2

[1] (1) Segment income represents income for each of our reportable segments and is defined as operating income less floorplan interest expense.

Segment Information (Reconcilia

Segment Information (Reconciliation) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting [Abstract]
Total segment income for reportable segments	[1]	$ 464.8	$ 558.2	$ 1,480.8	$ 1,726.4
Corporate and other		(83.6)	(46.4)	(277)	(148.5)
Other interest expense		(48.8)	(33.7)	(135.9)	(97.4)
Other income (loss), net		(5)	(4.6)	4.6	(24.7)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES		$ 327.4	$ 473.5	$ 1,072.5	$ 1,455.8

[1] (1) Segment income represents income for each of our reportable segments and is defined as operating income less floorplan interest expense.