Automatic Data Processing (ADP) 10-Q1 Nov 242025 Q1 Quarterly reportFinancial data

Company Profile

Cover Page

Cover Page - shares	3 Months Ended
Cover Page - shares	Sep. 30, 2024	Oct. 29, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2024
Document Transition Report	false
Entity File Number	1-5397
Entity Registrant Name	AUTOMATIC DATA PROCESSING, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	22-1467904
Entity Address, Address Line One	One ADP Boulevard
Entity Address, City or Town	Roseland,
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	07068
City Area Code	973
Local Phone Number	974-5000
Title of 12(b) Security	Common Stock, $0.10 Par Value(voting)
Trading Symbol	ADP
Security Exchange Name	NASDAQ
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		407,456,901
Entity Central Index Key	0000008670
Current Fiscal Year End Date	--06-30
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q1
Amendment Flag	false

Statements of Consolidated Earn

Statements of Consolidated Earnings - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Sep. 30, 2024	Sep. 30, 2023
REVENUES:
TOTAL REVENUES		$ 4,832.7	$ 4,512.4
Costs of revenues:
Operating expenses		2,285.8	2,157.6
Research and development		232.6	236.5
Depreciation and amortization		115.3	121.3
TOTAL COSTS OF REVENUES		2,633.7	2,515.4
Selling, general, and administrative expenses		926.7	880.3
Interest expense		137.8	91.6
TOTAL EXPENSES		3,698.2	3,487.3
Other (income)/expense, net		(101.7)	(67.7)
EARNINGS BEFORE INCOME TAXES		1,236.2	1,092.8
Provision for income taxes		279.9	233.4
NET EARNINGS		$ 956.3	$ 859.4
BASIC EARNINGS PER SHARE (in USD per share)		$ 2.34	$ 2.09
DILUTED EARNINGS PER SHARE (in USD per share)		$ 2.34	$ 2.08
Basic weighted average shares outstanding (in shares)		407.9	411.7
Diluted weighted average shares outstanding (in shares)		409.5	413.6
Revenues, other than interest on funds held for clients and PEO revenues
REVENUES:
TOTAL REVENUES		$ 3,007.2	$ 2,843
Interest on funds held for clients
REVENUES:
TOTAL REVENUES		253.3	201.7
PEO Revenues
REVENUES:
TOTAL REVENUES	[1]	$ 1,572.2	$ 1,467.7

[1]Professional Employer Organization (“PEO”) revenues are net of direct pass-through costs, primarily consisting of payroll wages and payroll taxes of $17,193.6 million and $15,994.6 million for the three months ended September 30, 2024 and 2023, respectively.

Statements of Consolidated Ea_2

Statements of Consolidated Earnings (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Direct pass-through costs PEO revenues	$ 17,193.6	$ 15,994.6

Statements of Consolidated Comp

Statements of Consolidated Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net earnings	$ 956.3	$ 859.4
Other comprehensive income/(losses):
Currency translation adjustments	49.2	(44.6)
Unrealized net (losses)/gains on available-for-sale securities	864.4	(150.6)
Tax effect	(197.9)	30.1
Reclassification of realized net losses on available-for-sale securities to net earnings	0.2	1.9
Tax effect	0	(0.4)
Unrealized loss on cash flow hedging activities	(12.5)	0
Tax effect	3.1	0
Amortization of unrealized losses on cash flow hedging activities	1.1	1.1
Tax effect	(0.3)	(0.3)
Reclassification of pension liability adjustment to net earnings	1.1	1
Tax effect	(0.3)	(0.2)
Other comprehensive (loss)/income, net of tax	708.1	(162)
Comprehensive income	$ 1,664.4	$ 697.4

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions		Sep. 30, 2024	Jun. 30, 2024
Current assets:
Cash and cash equivalents		$ 2,104.9	$ 2,913.4
Short-term marketable securities	[1]	5,242.2	384
Accounts receivable, net of allowance for doubtful accounts of $53.2 and $52.2, respectively		3,316.7	3,428.2
Other current assets		1,070.5	820.8
Total current assets before funds held for clients		11,734.3	7,546.4
Funds held for clients		28,176.9	37,996.1
Total current assets		39,911.2	45,542.5
Long-term marketable securities	[1]	940.6	0
Long-term receivables, net of allowance for doubtful accounts of $0.2 and $0.1, respectively		6.6	7.3
Property, plant and equipment, net		692.5	685.6
Operating lease right-of-use asset		362.5	370.6
Deferred contract costs		2,975.5	2,965
Other assets		923.2	1,102.1
Goodwill		2,369	2,353.6
Intangible assets, net		1,330.3	1,336
Total assets		49,511.4	54,362.7
Current liabilities:
Accounts payable		145.2	100.6
Accrued expenses and other current liabilities		2,973.9	3,349
Accrued payroll and payroll-related expenses		552.7	958.7
Dividends payable		565.9	566.4
Short-term deferred revenues		188.6	199.8
Obligations under reverse repurchase agreements	[1]	679.1	385.4
Obligations under commercial paper borrowing		4,375.4	0
Short-term debt		1,000.3	1.1
Income taxes payable		170.4	15.1
Total current liabilities before client funds obligations		10,651.5	5,576.1
Client funds obligations		28,720.9	39,503.9
Total current liabilities		39,372.4	45,080
Long-term debt		2,981.4	2,991.3
Operating lease liabilities		316.1	328.6
Other liabilities		977	990.8
Deferred income taxes		154.4	64.3
Long-term deferred revenues		361.5	360.1
Total liabilities		44,162.8	49,815.1
Commitments and contingencies (Note 13)
Stockholders' equity:
Preferred stock, $1.00 par value: authorized, 0.3 shares; issued, none		0	0
Common stock, $0.10 par value: authorized, 1,000.0 shares; issued, 638.7 shares at September 30, 2024 and June 30, 2024; outstanding, 407.7 and 408.1 shares at September 30, 2024 and June 30, 2024, respectively		63.9	63.9
Capital in excess of par value		2,528.6	2,406.9
Retained earnings		24,001.2	23,622.2
Treasury stock - at cost: 231.0 and 230.6 shares at September 30, 2024 and June 30, 2024, respectively		(20,144.9)	(19,737.1)
Accumulated other comprehensive (loss)/ income		(1,100.2)	(1,808.3)
Total stockholders’ equity		5,348.6	4,547.6
Total liabilities and stockholders’ equity		$ 49,511.4	$ 54,362.7

[1]As of September 30, 2024, $578.6 million of short-term marketable securities, $98.8 million of long-term marketable securities and $1.7 million of cash and cash equivalents have been pledged as collateral under the Company's reverse repurchase agreements. As of June 30, 2024, $384.0 million of short-term marketable securities and $1.4 million of cash and cash equivalents have been pledged as collateral under the Company's reverse repurchase agreements (see Note 9).

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Sep. 30, 2024	Jun. 30, 2024
Statement of Financial Position [Abstract]
Allowance for doubtful accounts, current	$ 53.2	$ 52.2
Allowance for doubtful accounts, long-term	$ 0.2	$ 0.1
Preferred stock, par value (in USD per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	0.3	0.3
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in USD per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	1,000	1,000
Common stock, shares issued (in shares)	638.7
Common stock, shares outstanding (in shares)	407.7	408.1
Treasury stock, shares (in shares)	231	230.6
Short-term marketable securities under reverse repurchase agreements	$ 578.6	$ 384
Long-term marketable securities under reverse repurchase agreements	98.8
Cash and cash equivalents under reverse repurchase agreements	$ 1.7	$ 1.4

Statements of Consolidated Cash

Statements of Consolidated Cash Flows - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash Flows from Operating Activities:
Net earnings	$ 956.3	$ 859.4
Adjustments to reconcile net earnings to cash flows provided by operating activities:
Depreciation and amortization	138.6	141.5
Amortization of deferred contract costs	281.4	262.3
Deferred income taxes	42.7	26.8
Stock-based compensation expense	60.6	58.8
Bad Debt Expense	11.2	13.1
Net pension income	(4.9)	(5.8)
Net accretion of discounts and amortization of premiums on available-for-sale securities	(15.5)	(5.5)
Other	0.9	(10.4)
Changes in operating assets and liabilities:
(Increase)/Decrease in accounts receivable	115.4	(107.9)
Increase in deferred contract costs	(269.8)	(261.9)
Increase in other assets	(217.1)	(304.9)
Increase/(Decrease) in accounts payable	48	(30.4)
Decrease in accrued expenses and other liabilities	(323.4)	(308.6)
Net cash flows provided by operating activities	824.4	326.5
Cash Flows from Investing Activities:
Purchases of corporate and client funds marketable securities	(2,771.7)	(710.2)
Proceeds from the sales and maturities of corporate and client funds marketable securities	1,266.8	632
Capital expenditures	(58.8)	(39.3)
Additions to intangibles	(80.9)	(87)
Acquisitions of businesses, net of cash acquired	0	(33.6)
Proceeds from sale of property, plant, and equipment and other assets	3.3	22
Other	(3.1)	0
Net cash flows used in investing activities	(1,644.4)	(216.1)
Cash Flows from Financing Activities:
Net decrease in client funds obligations	(10,870.5)	(1,374.9)
Net cash distributed from the Internal Revenue Service	(336.4)	0
Payments of debt	(0.3)	(0.2)
Proceeds from the issuance of debt	988.9	0
Settlement of cash flow hedges	(12.5)	0
Repurchases of common stock	(372.6)	(250)
Net proceeds from stock purchase plan and stock-based compensation plans	12	(36.6)
Dividends paid	(572.6)	(515.8)
Net proceeds related to reverse repurchase agreements	297.1	273.8
Net proceeds of commercial paper borrowings	4,375.4	0
Net cash flows used in financing activities	(6,491.5)	(1,903.7)
Effect of exchange rate changes on cash, cash equivalents, restricted cash, and restricted cash equivalents	17	(16.3)
Net change in cash, cash equivalents, restricted cash, and restricted cash equivalents	(7,294.5)	(1,809.6)
Cash, cash equivalents, restricted cash, and restricted cash equivalents, beginning of period	10,086	8,771.5
Cash, cash equivalents, restricted cash, and restricted cash equivalents, end of period	2,791.5	6,961.9
Supplemental disclosures of cash flow information:
Cash paid for interest	140.7	97
Cash paid for income taxes, net of income tax refunds	$ 64.7	$ 87.9

Statements of Consolidated Ca_2

Statements of Consolidated Cash Flows (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2024		Jun. 30, 2024	Sep. 30, 2023		Jun. 30, 2023
Reconciliation of cash, cash equivalents, restricted cash, and restricted cash equivalents to the Consolidated Balance Sheets
Cash and cash equivalents	$ 2,104.9		$ 2,913.4	$ 1,441.4
Restricted cash and restricted cash equivalents included in funds held for clients	686.6	[1]	7,172.6	5,520.5	[1]
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	$ 2,791.5		$ 10,086	$ 6,961.9		$ 8,771.5

[1]See Note 6 for a reconciliation of restricted cash and restricted cash equivalents in funds held for clients on the Consolidated Balance Sheets.

Basis of Presentation

Basis of Presentation	3 Months Ended
Basis of Presentation	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying Consolidated Financial Statements and footnotes thereto of Automatic Data Processing, Inc., its subsidiaries and variable interest entity (“ADP” or the “Company”) have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). The Consolidated Financial Statements and footnotes thereto are unaudited. In the opinion of the Company’s management, the Consolidated Financial Statements reflect all adjustments, which are of a normal recurring nature, that are necessary for a fair presentation of the Company’s interim financial results. The Company has a grantor trust, which holds the majority of the funds provided by its clients pending remittance to employees of those clients, tax authorities, and other payees. The Company is the sole beneficial owner of the trust. The trust meets the criteria in Accounting Standards Codification (“ASC”) 810, “Consolidation” to be characterized as a variable interest entity (“VIE”). The Company has determined that it has a controlling financial interest in the trust because it has both (1) the power to direct the activities that most significantly impact the economic performance of the trust (including the power to make all investment decisions for the trust) and (2) the right to receive benefits that could potentially be significant to the trust (in the form of investment returns) and, therefore, consolidates the trust. Further information on these funds and the Company’s obligations to remit to its clients’ employees, tax authorities, and other payees is provided in Note 6, “Corporate Investments and Funds Held for Clients.”

New Accounting Pronouncements

New Accounting Pronouncements	3 Months Ended
New Accounting Pronouncements	Sep. 30, 2024
Accounting Standards Update and Change in Accounting Principle [Abstract]
New Accounting Pronouncements	New Accounting Pronouncements Recently Adopted Accounting Pronouncements None. Recently Issued Accounting Pronouncements Standard Description Effective Date Effect on Financial Statements or Other Significant Matters ASU 2023-09 Income Taxes (Topic 740): Improvements to Income Tax Disclosures This update enhances the transparency and decision usefulness of income tax disclosures to better assess how an entity’s operations and related tax risks, tax planning and operational opportunities affect its tax rate and prospects for future cash flows. June 30, 2026 The Company is assessing this guidance. The adoption will modify disclosures but will not have an impact on the Company's consolidated results of operations, financial condition, and cash flows. ASU 2023-07 Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures This update improves reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses and certain quantitative disclosures. June 30, 2025 The Company is assessing this guidance. The adoption will modify disclosures but will not have an impact on the Company's consolidated results of operations, financial condition, and cash flows.

Revenue

Revenue	3 Months Ended
Revenue	Sep. 30, 2024
Revenue from Contract with Customer [Abstract]
Revenue	Revenue Based upon similar operational and economic characteristics, the Company’s revenues are disaggregated by its three business pillars: Human Capital Management (“HCM”), HR Outsourcing (“HRO”), and Global Solutions (“Global”), with separate disaggregation for PEO zero-margin benefits pass-through revenues and client funds interest revenues. The Company believes these revenue categories depict how the nature, amount, timing, and uncertainty of its revenue and cash flows are affected by economic factors. The following tables provide details of revenue by our business pillars, and include a reconciliation to the Company’s reportable segments: Three Months Ended September 30, Types of Revenues 2024 2023 HCM $ 2,025.4 $ 1,914.4 HRO, excluding PEO zero-margin benefits pass-throughs 865.2 811.7 PEO zero-margin benefits pass-throughs 1,049.2 976.7 Global 639.6 607.9 Interest on funds held for clients 253.3 201.7 Total Revenues $ 4,832.7 $ 4,512.4 Reconciliation of disaggregated revenue to our reportable segments for the three months ended September 30, 2024: Types of Revenues Employer Services PEO Other Total HCM $ 2,027.6 $ — $ (2.2) $ 2,025.4 HRO, excluding PEO zero-margin benefits pass-throughs 342.8 523.0 (0.6) 865.2 PEO zero-margin benefits pass-throughs — 1,049.2 — 1,049.2 Global 639.6 — — 639.6 Interest on funds held for clients 251.0 2.3 — 253.3 Total Segment Revenues $ 3,261.0 $ 1,574.5 $ (2.8) $ 4,832.7 Reconciliation of disaggregated revenue to our reportable segments for the three months ended September 30, 2023: Types of Revenues Employer Services PEO Other Total HCM $ 1,916.7 $ — $ (2.3) $ 1,914.4 HRO, excluding PEO zero-margin benefits pass-throughs 322.0 491.0 (1.3) 811.7 PEO zero-margin benefits pass-throughs — 976.7 — 976.7 Global 607.9 — — 607.9 Interest on funds held for clients 199.8 1.9 — 201.7 Total Segment Revenues $ 3,046.4 $ 1,469.6 $ (3.6) $ 4,512.4 Contract Balances The timing of revenue recognition for HCM, HRO and Global is consistent with the invoicing of clients, as invoicing occurs in the period the services are provided. Therefore, the Company does not recognize a contract asset or liability resulting from the timing of revenue recognition and invoicing. Changes in deferred revenues related to set up fees for the three months ended September 30, 2024 were as follows: Contract Liability Contract liability, July 1, 2024 $ 491.6 Recognition of revenue included in beginning of year contract liability (35.9) Contract liability, net of revenue recognized on contracts during the period 28.0 Currency translation adjustments 10.8 Contract liability, September 30, 2024 $ 494.5

Earnings per Share (_EPS_)

Earnings per Share (“EPS”)	3 Months Ended
Earnings per Share (“EPS”)	Sep. 30, 2024
Earnings Per Share [Abstract]
Earnings per Share (“EPS”)	Earnings per Share (“EPS”) Basic Effect of Employee Stock Option Shares Effect of Diluted Three Months Ended September 30, 2024 Net earnings $ 956.3 $ 956.3 Weighted average shares (in millions) 407.9 0.7 0.9 409.5 EPS $ 2.34 $ 2.34 Three Months Ended September 30, 2023 Net earnings $ 859.4 $ 859.4 Weighted average shares (in millions) 411.7 0.9 1.0 413.6 EPS $ 2.09 $ 2.08 For the three months ended September 30, 2024 and 2023, there were no stock options excluded from the calculation of diluted earnings per share due to anti-dilution.

Other (Income)_Expense, Net

Other (Income)/Expense, Net	3 Months Ended
Other (Income)/Expense, Net	Sep. 30, 2024
Other Income and Expenses [Abstract]
Other (Income)/Expense, Net	Other (Income)/Expense, Net Three Months Ended September 30, 2024 2023 Interest income on corporate funds $ (91.7) $ (46.5) Realized losses on available-for-sale securities, net 0.2 1.9 Gain on sale of assets (2.4) (14.6) Non-service components of pension income, net (see Note 11) (7.8) (8.5) Other (income)/expense, net $ (101.7) $ (67.7)

Corporate Investments and Funds

Corporate Investments and Funds Held For Clients	3 Months Ended
Corporate Investments and Funds Held For Clients	Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]
Corporate Investments and Funds Held for Clients	Corporate Investments and Funds Held for Clients Corporate investments and funds held for clients at September 30, 2024 and June 30, 2024 were as follows: September 30, 2024 Amortized Gross Gross Fair Market Value (A) Type of issue: Money market securities, cash and other cash equivalents $ 2,791.5 $ — $ — $ 2,791.5 Available-for-sale securities: Corporate bonds 17,705.4 129.0 (578.6) 17,255.8 U.S. Treasury securities 8,197.1 94.8 (81.7) 8,210.2 Canadian government obligations and Canadian government agency obligations 2,295.7 18.2 (52.2) 2,261.7 U.S. government agency securities 1,582.4 3.7 (98.2) 1,487.9 Asset-backed securities 1,614.4 22.6 (25.6) 1,611.4 Canadian provincial bonds 1,140.4 17.5 (35.6) 1,122.3 Commercial mortgage-backed securities 509.0 0.6 (21.7) 487.9 Other securities 1,279.9 7.2 (51.2) 1,235.9 Total available-for-sale securities 34,324.3 293.6 (944.8) 33,673.1 Total corporate investments and funds held for clients $ 37,115.8 $ 293.6 $ (944.8) $ 36,464.6 (A) Included within available-for-sale securities are corporate investments with fair values of $6,182.8 million and funds held for clients with fair values of $27,490.3 million. All available-for-sale securities were included in Level 2 of the fair value hierarchy. June 30, 2024 Amortized Gross Gross Fair Market Value (B) Type of issue: Money market securities, cash and other cash equivalents $ 10,086.0 $ — $ — $ 10,086.0 Available-for-sale securities: Corporate bonds 16,833.3 11.5 (944.8) 15,900.0 U.S. Treasury securities 7,701.2 9.0 (164.5) 7,545.7 Canadian government obligations and Canadian government agency obligations 2,130.7 1.7 (86.6) 2,045.8 U.S. government agency securities 1,645.0 0.5 (140.6) 1,504.9 Asset-backed securities 1,394.9 3.9 (43.0) 1,355.8 Canadian provincial bonds 1,116.3 2.3 (56.2) 1,062.4 Commercial mortgage-backed securities 535.9 — (35.1) 500.8 Other securities 1,366.0 2.0 (75.9) 1,292.1 Total available-for-sale securities 32,723.3 30.9 (1,546.7) 31,207.5 Total corporate investments and funds held for clients $ 42,809.3 $ 30.9 $ (1,546.7) $ 41,293.5 (B) Included within available-for-sale securities are corporate investments with fair values of $384.0 million and funds held for clients with fair values of $30,823.5 million. All available-for-sale securities were included in Level 2 of the fair value hierarchy. For a description of the fair value hierarchy and the Company's fair value methodologies, including the use of an independent third-party pricing service, see Note 1 “Summary of Significant Accounting Policies” in the Company's Annual Report on Form 10-K for fiscal 2024. The Company concurred with and did not adjust the prices obtained from the independent pricing service. The Company had no available-for-sale securities included in Level 1 or Level 3 at September 30, 2024. The unrealized losses and fair values of available-for-sale securities that have been in an unrealized loss position for a period of less than and greater than 12 months as of September 30, 2024, are as follows: September 30, 2024 Securities in Unrealized Loss Position Less Than 12 Months Securities in Unrealized Loss Position Greater Than 12 Months Total Gross Fair Market Gross Fair Market Gross Fair Corporate bonds $ (2.4) $ 346.9 $ (576.2) $ 12,170.6 $ (578.6) $ 12,517.5 U.S. Treasury securities (5.5) 77.9 (76.2) 3,172.5 (81.7) 3,250.4 Canadian government obligations and Canadian government agency obligations — 1.4 (52.2) 1,607.2 (52.2) 1,608.6 U.S. government agency securities — 0.8 (98.2) 1,384.3 (98.2) 1,385.1 Asset-backed securities (0.4) 96.1 (25.2) 624.0 (25.6) 720.1 Canadian provincial bonds — 1.1 (35.6) 661.2 (35.6) 662.3 Commercial mortgage-backed securities (0.3) 15.3 (21.4) 460.1 (21.7) 475.4 Other securities (6.2) 118.9 (45.0) 719.1 (51.2) 838.0 $ (14.8) $ 658.4 $ (930.0) $ 20,799.0 $ (944.8) $ 21,457.4 The unrealized losses and fair values of available-for-sale securities that have been in an unrealized loss position for a period of less than and greater than 12 months as of June 30, 2024, are as follows: June 30, 2024 Securities in Unrealized Loss Position Less Than 12 Months Securities in Unrealized Loss Position Greater Than 12 Months Total Gross Fair Market Gross Fair Market Gross Fair Corporate bonds $ (25.8) $ 2,173.6 $ (919.0) $ 12,413.4 $ (944.8) $ 14,587.0 U.S. Treasury securities (23.1) 2,186.2 (141.4) 4,076.9 (164.5) 6,263.1 Canadian government obligations and Canadian government agency obligations (0.9) 304.6 (85.7) 1,591.6 (86.6) 1,896.2 U.S. government agency securities (0.7) 51.5 (139.9) 1,428.2 (140.6) 1,479.7 Asset-backed securities (2.3) 351.4 (40.7) 668.0 (43.0) 1,019.4 Canadian provincial bonds (1.3) 193.0 (54.9) 717.4 (56.2) 910.4 Commercial mortgage-backed securities (0.5) 11.2 (34.6) 489.6 (35.1) 500.8 Other securities (12.2) 288.5 (63.7) 864.8 (75.9) 1,153.3 $ (66.8) $ 5,560.0 $ (1,479.9) $ 22,249.9 $ (1,546.7) $ 27,809.9 At September 30, 2024, corporate bonds include investment-grade debt securities with a wide variety of issuers, industries, and sectors, primarily carrying credit ratings of A and above, and have maturities ranging from October 2024 through September 2034. At September 30, 2024, asset-backed securities include AAA-rated senior tranches of securities with predomi nantly prime collateral of fixed-rate auto loan, credit card, and equipment lease receivables with fair values of $759.5 million, $486.8 million, and $189.5 million, respectively. These securities are collateralized by the cash flow s of the underlying pools of receivables. The primary risk associated with these securities is the collection risk of the underlying receivables. All collateral on such asset-backed securities has performed as expected through September 30, 2024. At September 30, 2024, U.S. government a gency securities primarily include debt directly issued by Federal Farm Credit Banks and Federal Home Loan Banks with fair values of $969.0 million and $482.2 million, respectively. U.S. government agency securities represent senior, unsecured, non-callable debt that primarily carry ratings of Aaa by Moody's, and AA+ by Standard & Poor's, with maturities ranging from October 2024 through August 2034. At September 30, 2024, U.S. government agency commercial mortgage-backed securities of $487.9 million include those issued by Federal Home Loan Mortgage Corporation and Federal National Mortgage Association. At September 30, 2024, other securities primarily include municipal bonds, diversified with a variety of issuers, with credit ratings of A and above with fair val ues of $543.2 million, AA-rated United Kingdom Gilt securities of $313.0 million, and AAA-rated supranational bonds of $218.3 million. Classification of corporate investments on the Consolidated Balance Sheets is as follows: September 30, June 30, 2024 2024 Corporate investments: Cash and cash equivalents $ 2,104.9 $ 2,913.4 Short-term marketable securities 5,242.2 384.0 Long-term marketable securities 940.6 — Total corporate investments $ 8,287.7 $ 3,297.4 Funds held for clients represent assets that, based upon the Company's intent, are restricted for use solely for the purposes of satisfying the obligations to remit funds relating to the Company’s payroll and payroll tax filing services, which are classified as client funds obligations on our Consolidated Balance Sheets. Funds held for clients have been invested in the following categories: September 30, June 30, 2024 2024 Funds held for clients: Restricted cash and cash equivalents held to satisfy client funds obligations $ 686.6 $ 7,172.6 Restricted short-term marketable securities held to satisfy client funds obligations 1,211.8 5,538.1 Restricted long-term marketable securities held to satisfy client funds obligations 26,278.5 25,285.4 Total funds held for clients $ 28,176.9 $ 37,996.1 Client funds obligations represent the Company's contractual obligations to remit funds to satisfy clients' payroll, tax, and other payee payment obligations and are recorded on the Consolidated Balance Sheets at the time that the Company impounds funds from clients. The client funds obligations represent liabilities that will be repaid within one year of the balance sheet date. The Company has reported client funds obligations as a current liability on the Consolidated Balance Sheets totalin g $28,720.9 million and $39,503.9 million at September 30, 2024 and June 30, 2024, respectively. The Company has classified funds held for clients as a current asset since these funds are held solely for the purpose of satisfying the client funds obligations. Of the Company’s funds held for clients at September 30, 2024 and June 30, 2024, $25,338.3 million and $34,940.0 million, respectively, are held in the grantor trust. The liabilities held within the trust are intercompany liabilities to other Company subsidiaries and are eliminated in consolidation. The Company has reported the cash flows related to the purchases of corporate and client funds marketable securities and related to the proceeds from the sales and maturities of corporate and client funds marketable securities on a gross basis in the investing section of the Statements of Consolidated Cash Flows. The Company has reported the cash and cash equivalents related to client funds investments with original maturities of ninety All available-for-sale securities were rated as investment grade at September 30, 2024. Expected maturities of available-for-sale securities at September 30, 2024 are as follows: One year or less $ 6,454.0 One year to two years 7,883.9 Two years to three years 4,589.9 Three years to four years 5,437.6 After four years 9,307.7 Total available-for-sale securities $ 33,673.1

Leases

Leases	3 Months Ended
Leases	Sep. 30, 2024
Leases [Abstract]
Leases	Leases The Company records leases on the Consolidated Balance Sheets as operating lease right-of-use (“ROU”) assets, records the current portion of operating lease liabilities within accrued expenses and other current liabilities The Company has entered into operating lease agreements for facilities and equipment. The Company's leases have remaining lease terms of up to approximately eleven years. The components of operating lease expense were as follows: Three Months Ended September 30, 2024 2023 Operating lease cost $ 27.5 $ 34.0 Short-term lease cost 0.3 0.5 Variable lease cost 6.6 3.2 Total operating lease cost $ 34.4 $ 37.7 The following table provides supplemental cash flow information related to the Company's leases: Three Months Ended September 30, 2024 2023 Cash paid for operating lease liabilities $ 28.8 $ 30.5 Operating lease ROU assets obtained in exchange for new operating lease liabilities $ 13.7 $ 26.9 Other information related to our operating lease liabilities is as follows: September 30, June 30, 2024 2024 Weighted-average remaining lease term (in years) 5 5 Weighted-average discount rate 3.3 % 3.3 % Current operating lease liability $ 96.0 $ 92.2 As of September 30, 2024, maturities of operating lease liabilities are as follows: Nine months ending June 30, 2025 $ 82.4 Twelve months ending June 30, 2026 98.5 Twelve months ending June 30, 2027 85.2 Twelve months ending June 30, 2028 64.7 Twelve months ending June 30, 2029 42.2 Thereafter 76.9 Total undiscounted lease obligations 449.9 Less: Imputed interest (37.8) Net lease obligations $ 412.1

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, net	3 Months Ended
Goodwill and Intangible Assets, net	Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets, net	Goodwill and Intangible Assets, net Changes in goodwill for the three months ended September 30, 2024 are as follows: Employer PEO Total Balance at June 30, 2024 $ 2,348.8 $ 4.8 $ 2,353.6 Currency translation adjustments 15.4 — 15.4 Balance at September 30, 2024 $ 2,364.2 $ 4.8 $ 2,369.0 Components of intangible assets, net, are as follows: September 30, June 30, 2024 2024 Intangible assets: Software and software licenses $ 3,874.3 $ 3,803.7 Customer contracts and lists 1,192.9 1,181.6 Other intangibles 242.2 242.0 5,309.4 5,227.3 Less accumulated amortization: Software and software licenses (2,707.0) (2,642.6) Customer contracts and lists (1,030.5) (1,007.6) Other intangibles (241.6) (241.1) (3,979.1) (3,891.3) Intangible assets, net $ 1,330.3 $ 1,336.0 Other intangibles consist primarily of purchased rights, trademarks and trade names (acquired directly or through acquisitions). All intangible assets have finite lives and, as such, are subject to amortization. The weighted average remaining useful life of the intangible assets is 5 years (6 years for software and software licenses, 3 years for customer contracts and lists, and 1 year for other intangibles). Amortization of intangible assets was $89.0 million and $95.7 million for the three months ended September 30, 2024 and 2023, respectively. Estimated future amortization expenses of the Company's existing intangible assets are as follows: Amount Nine months ending June 30, 2025 $ 327.7 Twelve months ending June 30, 2026 $ 265.5 Twelve months ending June 30, 2027 $ 195.1 Twelve months ending June 30, 2028 $ 152.2 Twelve months ending June 30, 2029 $ 124.0 Twelve months ending June 30, 2030 $ 86.0

Short-term Financing

Short-term Financing	3 Months Ended
Short-term Financing	Sep. 30, 2024
Debt Disclosure [Abstract]
Short-term Financing	Short-term Financing The Company has a $4.55 billion, 364-day credit agreement that matures in June 2025 with a one year term-out option. The Company also has a $2.25 billion, five year credit facility that matures in June 2028 that contains an accordion feature under which the aggregate commitment can be increased by $500 million, subject to the availability of additional commitments. In addition, the Company also has a five year, $3.5 billion credit facility maturing in June 2029 that contains an accordion feature under which the aggregate commitment can be increased by $500 million, subject to the availability of additional commitments. The interest rate applicable to committed borrowings is tied to SOFR, the effective federal funds rate, or the prime rate depending on the notification provided by the Company to the syndicated financial institutions prior to borrowing. The Company is also required to pay facility fees on the credit agreements. The primary uses of the credit facilities are to provide liquidity to the commercial paper program and funding for general corporate purposes, if necessary. The Company had no borrowings through September 30, 2024 under the credit agreements. The Company's U.S. short-term funding requirements related to client funds are sometimes obtained on an unsecured basis through the issuance of commercial paper, rather than liquidating previously-collected client funds that have already been invested in available-for-sale securities. This commercial paper program provides for the issuance of up to $10.3 billion in aggregate maturity value. The Company’s commercial paper program is rated A-1+ by Standard & Poor’s, Prime-1 (“P-1”) by Moody’s and F1+ by Fitch. These ratings denote the highest quality commercial paper securities. Maturities of commercial paper can range from overnight to up to 364 days. At September 30, 2024, the Company had $4.4 billion of commercial paper outstanding, which was repaid in early October 2024. At June 30, 2024, the Company had no commercial paper borrowing outstanding. Details of the borrowings under the commercial paper program are as follows: Three Months Ended September 30, 2024 2023 Average daily borrowings (in billions) $ 4.8 $ 4.1 Weighted average interest rates 5.3 % 5.3 % Weighted average maturity (approximately in days) 2 days 2 days The Company’s U.S., Canadian and United Kingdom short-term funding requirements related to client funds obligations are sometimes obtained on a secured basis through the use of reverse repurchase agreements, which are collateralized principally by government and government agency securities, rather than liquidating previously-collected client funds that have already been invested in available-for-sale securities. These agreements generally have terms ranging from overnight to up to five Three Months Ended September 30, 2024 2023 Average outstanding balances (in billions) $ 3.8 $ 1.4 Weighted average interest rates 5.3 % 5.3 %

Debt

Debt	3 Months Ended
Debt	Sep. 30, 2024
Debt Disclosure [Abstract]
Debt	Debt The Company issued four series of fixed-rate notes with staggered maturities of 7 and 10 years totaling $4.0 billion (collectively the “Notes”). The Notes are senior unsecured obligations, and interest is payable in arrears, semi-annually. During the three months ended September 30, 2024, the Company issued $1.0 billion of senior notes due in 2034 bearing a fixed interest rate of 4.450%. In connection with the senior notes issuance, the Company terminated several derivative contracts in place to hedge exposure in changes in benchmark interest rates for the senior notes issued with an aggregate notional amount totaling $1.0 billion (of which $400.0 million were executed during the three months ended September 30, 2024 and $600.0 million were executed on the day of issuance). Since these derivative contracts were classified as cash flow hedges, the unamortized loss of $12.5 million was deferred in accumulated other comprehensive income and will be amortized to earnings over the life of the issued Notes as the interest payments are made. The principal amounts and associated effective interest rates of the Notes and other debt as of September 30, 2024 and June 30, 2024, are as follows: Debt instrument Effective Interest Rate September 30, 2024 June 30, 2024 Fixed-rate 3.375% notes due September 15, 2025 3.47% $ 1,000.0 $ 1,000.0 Fixed-rate 1.700% notes due May 15, 2028 1.85% 1,000.0 1,000.0 Fixed-rate 1.250% notes due September 1, 2030 1.83% 1,000.0 1,000.0 Fixed-rate 4.450% notes due September 9, 2034 4.75% 1,000.0 — Other 3.7 4.1 4,003.7 3,004.1 Less: current portion (1,000.3) (1.1) Less: unamortized discount and debt issuance costs (22.0) (11.7) Total long-term debt $ 2,981.4 $ 2,991.3 The effective interest rates for the Notes include the interest on the Notes and amortization of the discount and debt issuance costs.

Employee Benefit Plans

Employee Benefit Plans	3 Months Ended
Employee Benefit Plans	Sep. 30, 2024
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans A. Stock-based Compensation Plans. Stock-based compensation consists of the following: The Company's share-based compensation consists of stock options, time-based restricted stock, time-based restricted stock units, performance-based restricted stock, and performance-based restricted stock units. The Company also offers an employee stock purchase plan for eligible employees. Beginning in September 2022, the Company discontinued granting stock options, time-based restricted stock and performance-based restricted stock. Any such future awards will be grants of time-based restricted stock units and/or performance-based restricted stock units, depending on employee eligibility. Time-based restricted stock unit awards and performance-based restricted stock unit awards granted to employees with a home country of the United States are settled in stock, and for awards granted to employees with a home country outside the United States are generally settled in cash. • Restricted Stock. • Time-Based Restricted Stock Units. Time-based restricted stock units generally vest ratably over 3 years. Awards are generally forfeited if the employee ceases to be employed by the Company prior to vesting. Time-based restricted stock unit awards granted to employees with a home country of the United States are settled in stock and cannot be transferred during the vesting period. Time-based restricted stock unit awards granted to employees with a home country outside the United States are generally settled in cash and cannot be transferred during the vesting period. Compensation expense relating to the issuance of share-settled units is measured based on the fair value of the award on the grant date and recognized on a straight-line basis over the vesting period. Compensation expense relating to the issuance of cash-settled units is recorded over the vesting period and is initially based on the fair value of the award on the grant date and is subsequently remeasured at each reporting date during the vesting period based on the change in the ADP stock price. Dividend cash equivalents are paid on share-settled units, and dividend cash equivalents are not paid on cash-settled units. • Performance-Based Restricted Stock Units. Performance-based restricted stock units generally vest over a one Performance-based restricted stock units cannot be transferred and are settled in either cash or stock, depending on the employee's home country. Compensation expense relating to the issuance of performance-based restricted stock units settled in cash is recognized over the vesting period initially based on the fair value of the award on the grant date with subsequent adjustments to the number of units awarded during the performance period based on probable and actual performance against targets. In addition, compensation expense is remeasured at each reporting period during the vesting period based on the change in the ADP stock price. Compensation expense relating to the issuance of performance-based restricted stock units settled in stock is recorded over the vesting period based on the fair value of the award on the grant date with subsequent adjustments to the number of units awarded based on the probable and actual performance against targets. Dividend equivalents are paid on awards under the performance-based restricted stock unit program. • Employee Stock Purchase Plan. The Company offers an employee stock purchase plan that allows eligible employees to purchase shares of common stock at a price equal to 95% of the market value for the Company's common stock on the last day of the offering period. This plan has been deemed non-compensatory and, therefore, no compensation expense has been recorded. The Company currently utilizes treasury stock to satisfy stock option exercises, issuances under the Company's employee stock purchase plan, and restricted stock awards. From time to time, the Company may repurchase shares of its common stock under its authorized share repurchase program. The Company repurchased 1.4 million and 1.0 million shares in the three months ended September 30, 2024 and 2023, respectively. The Company considers several factors in determining when to execute share repurchases, including, among other things, actual and potential acquisition activity, cash balances and cash flows, issuances due to employee benefit plan activity, and market conditions. The following table represents pre-tax stock-based compensation expense for the three months ended September 30, 2024 and 2023, respectively: Three Months Ended September 30, 2024 2023 Operating expenses $ 9.1 $ 7.4 Selling, general and administrative expenses 42.3 42.8 Research and development 9.2 8.6 Total stock-based compensation expense $ 60.6 $ 58.8 During the three months ended September 30, 2024, the following activity occurred under the Company’s existing plans. Stock Options: Number Weighted Options outstanding at July 1, 2024 2,042 $ 159 Options granted — $ — Options exercised (498) $ 162 Options forfeited/cancelled — $ — Options outstanding at September 30, 2024 1,544 $ 158 Time-Based Restricted Stock and Time-Based Restricted Stock Units: Number of Shares Number of Units Restricted shares/units outstanding at July 1, 2024 124 1,053 Restricted shares/units granted — 578 Restricted shares/units vested (114) (418) Restricted shares/units forfeited — (11) Restricted shares/units outstanding at September 30, 2024 10 1,202 Performance-Based Restricted Stock and Performance-Based Restricted Stock Units: Number of Shares Number of Units Restricted shares/units outstanding at July 1, 2024 88 753 Restricted shares/units granted — 293 Restricted shares/units vested (58) (293) Restricted shares/units forfeited (2) (2) Restricted shares/units outstanding at September 30, 2024 28 751 B. Pension Plans The components of net pension income were as follows: Three Months Ended September 30, 2024 2023 Service cost – benefits earned during the period $ 1.5 $ 1.3 Interest cost on projected benefits 21.9 21.2 Expected return on plan assets (29.0) (29.0) Net amortization and deferral 0.7 0.7 Net pension (income)/expense $ (4.9) $ (5.8)

Income Taxes

Income Taxes	3 Months Ended
Income Taxes	Sep. 30, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The effective tax rate for the three months ended September 30, 2024 and 2023 was 22.6% and 21.4%, respectively. The increase in the effective tax rate is primarily due to lower reserves for uncertain tax positions and a valuation allowance release in the three months ended September 30, 2023.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies In May 2020, a putative class action complaint was filed against ADP, TotalSource and related defendants in the U.S. District Court, District of New Jersey. The complaint asserts violations of the Employee Retirement Income Security Act of 1974 (“ERISA”) in connection with the ADP TotalSource Retirement Savings Plan’s fiduciary administrative and investment decision-making. The complaint seeks statutory and other unspecified monetary damages, injunctive relief and attorney’s fees. The Company is unable to estimate any reasonably possible loss, or range of loss, with respect to this matter. The Company is vigorously defending against this lawsuit. The Company is subject to various claims, litigation, and regulatory compliance matters in the normal course of business. When a loss is considered probable and reasonably estimable, the Company records a liability in the amount of its best estimate for the ultimate loss. Management currently believes that the resolution of these claims, litigation and regulatory compliance matters against us, individually or in the aggregate, will not have a material adverse impact on our consolidated results of operations, financial condition or cash flows. These matters are subject to inherent uncertainties and management's view of these matters may change in the future. It is not the Company’s business practice to enter into off-balance sheet arrangements. In the normal course of business, the Company may enter into contracts in which it makes representations and warranties that relate to the performance of the Company’s services and products. The Company does not expect any material losses related to such representations and warranties.

Stockholders' Equity

Stockholders' Equity	3 Months Ended
Stockholders' Equity	Sep. 30, 2024
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Changes in stockholders' equity by component are as follows: Three Months Ended September 30, 2024 Common Stock Capital in Excess of Par Value Retained Earnings Treasury Stock AOCI Total Balance at June 30, 2024 $ 63.9 $ 2,406.9 $ 23,622.2 $ (19,737.1) $ (1,808.3) $ 4,547.6 Net earnings — — 956.3 — — 956.3 Other comprehensive income — — — — 708.1 708.1 Stock-based compensation expense — 54.8 — — — 54.8 Issuances relating to stock compensation plans — 66.9 — 49.7 — 116.6 Treasury stock acquired (1.4 million shares repurchased) — — — (457.5) — (457.5) Dividends declared ($1.40 per share) — — (577.3) — — (577.3) Balance at September 30, 2024 $ 63.9 $ 2,528.6 $ 24,001.2 $ (20,144.9) $ (1,100.2) $ 5,348.6 Three Months Ended September 30, 2023 Common Stock Capital in Excess of Par Value Retained Earnings Treasury Stock AOCI Total Balance at June 30, 2023 $ 63.9 $ 2,102.3 $ 22,118.0 $ (18,469.3) $ (2,305.8) $ 3,509.1 Net earnings — — 859.4 — — 859.4 Other comprehensive income — — — — (162.0) (162.0) Stock-based compensation expense — 54.0 — — — 54.0 Issuances relating to stock compensation plans — 32.4 — 49.4 — 81.8 Treasury stock acquired (1.0 million shares repurchased) — — — (347.5) — (347.5) Dividends declared ($1.25 per share) — — (522.0) — — (522.0) Balance at September 30, 2023 $ 63.9 $ 2,188.7 $ 22,455.4 $ (18,767.4) $ (2,467.8) $ 3,472.8

Reclassifications out of Accumu

Reclassifications out of Accumulated Other Comprehensive Income (“AOCI”)	3 Months Ended
	Sep. 30, 2024
Equity [Abstract]
Reclassifications out of Accumulated Other Comprehensive Income (“AOCI”)	Reclassifications out of Accumulated Other Comprehensive Income (“AOCI”) Changes in AOCI by component are as follows: Three Months Ended September 30, 2024 Currency Translation Adjustment Net Gains/Losses on Available-for-sale Securities Cash Flow Hedging Activities Pension Liability Accumulated Other Comprehensive (Loss) /Income Balance at June 30, 2024 $ (378.8) $ (1,178.0) $ (20.0) $ (231.5) $ (1,808.3) Other comprehensive income/(loss) before reclassification adjustments 49.2 864.4 (12.5) — 901.1 Tax effect — (197.9) 3.1 — (194.8) Reclassification adjustments to net earnings — 0.2 (A) 1.1 (C) 1.1 (B) 2.4 Tax effect — — (0.3) (0.3) (0.6) Balance at September 30, 2024 $ (329.6) $ (511.3) $ (28.6) $ (230.7) $ (1,100.2) Three Months Ended September 30, 2023 Currency Translation Adjustment Net Gains/Losses on Available-for-sale Securities Cash Flow Hedging Activities Pension Liability Accumulated Other Comprehensive (Loss) /Income Balance at June 30, 2023 $ (340.8) $ (1,705.6) $ (23.3) $ (236.1) $ (2,305.8) Other comprehensive income/(loss) before reclassification adjustments (44.6) (150.6) — — (195.2) Tax effect — 30.1 — — 30.1 Reclassification adjustments to net earnings — 1.9 (A) 1.1 (C) 1.0 (B) 4.0 Tax effect — (0.4) (0.3) (0.2) (0.9) Balance at September 30, 2023 $ (385.4) $ (1,824.6) $ (22.5) $ (235.3) $ (2,467.8) (A) Reclassification adjustments out of AOCI are included within Other (income)/expense, net, on the Statements of Consolidated Earnings. (B) Reclassification adjustments out of AOCI are included in net pension (income)/expense (see Note 11). (C) Reclassification adjustments out of AOCI are included in Interest expense on the Statements of Consolidated Earnings (see Note 10).

Interim Financial Data by Segme

Interim Financial Data by Segment	3 Months Ended
Interim Financial Data by Segment	Sep. 30, 2024
Segment Reporting [Abstract]
Interim Financial Data by Segment	Interim Financial Data by Segment Based upon similar economic and operational characteristics, the Company’s strategic business units have been aggregated into the following two reportable segments: Employer Services and PEO Services. The primary components of the “Other” segment are certain corporate overhead charges and expenses that have not been allocated to the reportable segments, including corporate functions, costs related to transformation, severance costs, non-recurring gains and losses, the elimination of intercompany transactions, interest expense and corporate interest income. Certain revenues and expenses are charged to the reportable segments at a standard rate for management reasons. Other costs are recorded based on management responsibility. Segment Results: Revenues Three Months Ended September 30, 2024 2023 Employer Services $ 3,261.0 $ 3,046.4 PEO Services 1,574.5 1,469.6 Other (2.8) (3.6) $ 4,832.7 $ 4,512.4 Earnings before Income Taxes Three Months Ended September 30, 2024 2023 Employer Services $ 1,164.3 $ 1,008.5 PEO Services 225.6 222.9 Other (153.7) (138.6) $ 1,236.2 $ 1,092.8

Subsequent Events

Subsequent Events	3 Months Ended
Subsequent Events	Sep. 30, 2024
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events In October 2024, the Company acquired WorkForce Software, a premier workforce management solutions provider that specializes in supporting large, global enterprises, for approximately $1.2 billion in cash. The results of WorkForce Software will be reported within the Company’s Employer Services segment. The Company has not yet finalized the purchase price allocation for this acquisition.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Pay vs Performance Disclosure
Net Income (Loss) Attributable to Parent	$ 956.3	$ 859.4

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Sep. 30, 2024 shares
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	During the fiscal quarter ended September 30, 2024, our executive officers adopted the following trading arrangements that are intended to satisfy the affirmative defense of Rule 10b5–1(c) . Name & Title Date of Adoption Duration of Trading Arrangement The maximum number of securities to be sold pursuant to the trading arrangement (1) John Ayala, Chief Operating Officer September 10, 2024 January 3, 2025 – December 31, 2025 47,709 Maria Black, President and Chief Executive Officer September 6, 2024 January 3, 2025 – December 31, 2025 46,783 Michael Bonarti, Chief Administrative Officer September 9, 2024 February 3, 2025 – December 31, 2025 43,905 Christopher D’Ambrosio, Chief Strategy Officer September 9, 2024 February 10, 2025 – December 30, 2025 2,856 Joseph DeSilva, President, Global Sales September 9, 2024 January 2, 2025 – December 31, 2025 19,827 Sreeni Kutam, President, Global Product and Innovation September 6, 2024 January 2, 2025 – December 31, 2025 49,907 David Kwon, Chief Legal Officer/General Counsel September 5, 2024 January 2, 2025 – December 31, 2025 3,470 Jonathan Lehberger, Corporate Controller September 5, 2024 January 2, 2025 – December 31, 2025 4,803 Don McGuire, Chief Financial Officer September 6, 2024 January 2, 2025 – December 31, 2025 24,387 Carlos Rodriguez, Director September 5, 2024 January 7, 2025 – December 31, 2025 145,246 (1) Securities reported in this column reflect options, restricted stock units (“RSUs”), performance-based stock units (“PSUs”) and shares of common stock, as appropriate. In the case of RSUs, quantities included in this column reflect the full amount of RSUs as reported in an officer’s respective plan and do not reflect the impact of tax withholding which will not be determined until the RSUs vest. In the case of PSUs (which have a three-year performance period), quantities included in this column reflect the application of the actual performance factor for tranches where performance has been certified, application at target for tranches where performance is not yet complete, and inclusion of accrued dividend equivalents through the date of adoption of the trading arrangement. The PSU amounts do not reflect the impact of tax withholding which will not be determined until the PSUs vest. In addition, securities reported in this column include securities subject to limit orders and such orders may not fill if limit order conditions are not met.
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
John Ayala [Member]
Trading Arrangements, by Individual
Name	John Ayala
Title	Chief Operating Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	September 10, 2024
Expiration Date	December 31, 2025
Arrangement Duration	362 days
Aggregate Available	47,709
Maria Black [Member]
Trading Arrangements, by Individual
Name	Maria Black
Title	President and Chief Executive Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	September 6, 2024
Expiration Date	December 31, 2025
Arrangement Duration	362 days
Aggregate Available	46,783
Michael Bonarti [Member]
Trading Arrangements, by Individual
Name	Michael Bonarti
Title	Chief Administrative Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	September 9, 2024
Expiration Date	December 31, 2025
Arrangement Duration	331 days
Aggregate Available	43,905
Christopher D’Ambrosio [Member]
Trading Arrangements, by Individual
Name	Christopher D’Ambrosio
Title	Chief Strategy Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	September 9, 2024
Expiration Date	December 30, 2025
Arrangement Duration	323 days
Aggregate Available	2,856
Joseph DeSilva [Member]
Trading Arrangements, by Individual
Name	Joseph DeSilva
Title	President, Global Sales
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	September 9, 2024
Expiration Date	December 31, 2025
Arrangement Duration	363 days
Aggregate Available	19,827
Sreeni Kutam [Member]
Trading Arrangements, by Individual
Name	Sreeni Kutam
Title	President, Global Product and Innovation
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	September 6, 2024
Expiration Date	December 31, 2025
Arrangement Duration	363 days
Aggregate Available	49,907
David Kwon [Member]
Trading Arrangements, by Individual
Name	David Kwon
Title	Chief Legal Officer/General Counsel
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	September 5, 2024
Expiration Date	December 31, 2025
Arrangement Duration	363 days
Aggregate Available	3,470
Jonathan Lehberger [Member]
Trading Arrangements, by Individual
Name	Jonathan Lehberger
Title	Corporate Controller
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	September 5, 2024
Expiration Date	December 31, 2025
Arrangement Duration	363 days
Aggregate Available	4,803
Don McGuire [Member]
Trading Arrangements, by Individual
Name	Don McGuire
Title	Chief Financial Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	September 6, 2024
Expiration Date	December 31, 2025
Arrangement Duration	363 days
Aggregate Available	24,387
Carlos Rodriguez [Member]
Trading Arrangements, by Individual
Name	Carlos Rodriguez
Title	Director
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	September 5, 2024
Expiration Date	December 31, 2025
Arrangement Duration	358 days
Aggregate Available	145,246

New Accounting Pronouncements (

New Accounting Pronouncements (Policies)	3 Months Ended
New Accounting Pronouncements (Policies)	Sep. 30, 2024
Accounting Standards Update and Change in Accounting Principle [Abstract]
Basis of Presentation	Basis of Presentation The accompanying Consolidated Financial Statements and footnotes thereto of Automatic Data Processing, Inc., its subsidiaries and variable interest entity (“ADP” or the “Company”) have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). The Consolidated Financial Statements and footnotes thereto are unaudited. In the opinion of the Company’s management, the Consolidated Financial Statements reflect all adjustments, which are of a normal recurring nature, that are necessary for a fair presentation of the Company’s interim financial results. The Company has a grantor trust, which holds the majority of the funds provided by its clients pending remittance to employees of those clients, tax authorities, and other payees. The Company is the sole beneficial owner of the trust. The trust meets the criteria in Accounting Standards Codification (“ASC”) 810, “Consolidation” to be characterized as a variable interest entity (“VIE”). The Company has determined that it has a controlling financial interest in the trust because it has both (1) the power to direct the activities that most significantly impact the economic performance of the trust (including the power to make all investment decisions for the trust) and (2) the right to receive benefits that could potentially be significant to the trust (in the form of investment returns) and, therefore, consolidates the trust. Further information on these funds and the Company’s obligations to remit to its clients’ employees, tax authorities, and other payees is provided in Note 6, “Corporate Investments and Funds Held for Clients.”
New Accounting Pronouncements	New Accounting Pronouncements Recently Adopted Accounting Pronouncements None. Recently Issued Accounting Pronouncements Standard Description Effective Date Effect on Financial Statements or Other Significant Matters ASU 2023-09 Income Taxes (Topic 740): Improvements to Income Tax Disclosures This update enhances the transparency and decision usefulness of income tax disclosures to better assess how an entity’s operations and related tax risks, tax planning and operational opportunities affect its tax rate and prospects for future cash flows. June 30, 2026 The Company is assessing this guidance. The adoption will modify disclosures but will not have an impact on the Company's consolidated results of operations, financial condition, and cash flows. ASU 2023-07 Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures This update improves reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses and certain quantitative disclosures. June 30, 2025 The Company is assessing this guidance. The adoption will modify disclosures but will not have an impact on the Company's consolidated results of operations, financial condition, and cash flows.

Revenue (Tables)

Revenue (Tables)	3 Months Ended
Revenue (Tables)	Sep. 30, 2024
Revenue from Contract with Customer [Abstract]
Summary of Disaggregation of Revenue	The following tables provide details of revenue by our business pillars, and include a reconciliation to the Company’s reportable segments: Three Months Ended September 30, Types of Revenues 2024 2023 HCM $ 2,025.4 $ 1,914.4 HRO, excluding PEO zero-margin benefits pass-throughs 865.2 811.7 PEO zero-margin benefits pass-throughs 1,049.2 976.7 Global 639.6 607.9 Interest on funds held for clients 253.3 201.7 Total Revenues $ 4,832.7 $ 4,512.4 Reconciliation of disaggregated revenue to our reportable segments for the three months ended September 30, 2024: Types of Revenues Employer Services PEO Other Total HCM $ 2,027.6 $ — $ (2.2) $ 2,025.4 HRO, excluding PEO zero-margin benefits pass-throughs 342.8 523.0 (0.6) 865.2 PEO zero-margin benefits pass-throughs — 1,049.2 — 1,049.2 Global 639.6 — — 639.6 Interest on funds held for clients 251.0 2.3 — 253.3 Total Segment Revenues $ 3,261.0 $ 1,574.5 $ (2.8) $ 4,832.7 Reconciliation of disaggregated revenue to our reportable segments for the three months ended September 30, 2023: Types of Revenues Employer Services PEO Other Total HCM $ 1,916.7 $ — $ (2.3) $ 1,914.4 HRO, excluding PEO zero-margin benefits pass-throughs 322.0 491.0 (1.3) 811.7 PEO zero-margin benefits pass-throughs — 976.7 — 976.7 Global 607.9 — — 607.9 Interest on funds held for clients 199.8 1.9 — 201.7 Total Segment Revenues $ 3,046.4 $ 1,469.6 $ (3.6) $ 4,512.4
Summary of Contract with Customer, Liability	Changes in deferred revenues related to set up fees for the three months ended September 30, 2024 were as follows: Contract Liability Contract liability, July 1, 2024 $ 491.6 Recognition of revenue included in beginning of year contract liability (35.9) Contract liability, net of revenue recognized on contracts during the period 28.0 Currency translation adjustments 10.8 Contract liability, September 30, 2024 $ 494.5

Earnings per Share (_EPS_) (Tab

Earnings per Share (“EPS”) (Tables)	3 Months Ended
Earnings per Share (“EPS”) (Tables)	Sep. 30, 2024
Earnings Per Share [Abstract]
Schedule of Earnings per Share, Basic and Diluted	Basic Effect of Employee Stock Option Shares Effect of Diluted Three Months Ended September 30, 2024 Net earnings $ 956.3 $ 956.3 Weighted average shares (in millions) 407.9 0.7 0.9 409.5 EPS $ 2.34 $ 2.34 Three Months Ended September 30, 2023 Net earnings $ 859.4 $ 859.4 Weighted average shares (in millions) 411.7 0.9 1.0 413.6 EPS $ 2.09 $ 2.08

Other (Income)_Expense, Net (Ta

Other (Income)/Expense, Net (Tables)	3 Months Ended
Other (Income)/Expense, Net (Tables)	Sep. 30, 2024
Other Income and Expenses [Abstract]
Schedule of Other (Income)/Expense, Net	Three Months Ended September 30, 2024 2023 Interest income on corporate funds $ (91.7) $ (46.5) Realized losses on available-for-sale securities, net 0.2 1.9 Gain on sale of assets (2.4) (14.6) Non-service components of pension income, net (see Note 11) (7.8) (8.5) Other (income)/expense, net $ (101.7) $ (67.7)

Corporate Investments and Fun_2

Corporate Investments and Funds Held for Clients (Tables)	3 Months Ended
Corporate Investments and Funds Held for Clients (Tables)	Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]
Summary of Debt Securities, Available-for-Sale	Corporate investments and funds held for clients at September 30, 2024 and June 30, 2024 were as follows: September 30, 2024 Amortized Gross Gross Fair Market Value (A) Type of issue: Money market securities, cash and other cash equivalents $ 2,791.5 $ — $ — $ 2,791.5 Available-for-sale securities: Corporate bonds 17,705.4 129.0 (578.6) 17,255.8 U.S. Treasury securities 8,197.1 94.8 (81.7) 8,210.2 Canadian government obligations and Canadian government agency obligations 2,295.7 18.2 (52.2) 2,261.7 U.S. government agency securities 1,582.4 3.7 (98.2) 1,487.9 Asset-backed securities 1,614.4 22.6 (25.6) 1,611.4 Canadian provincial bonds 1,140.4 17.5 (35.6) 1,122.3 Commercial mortgage-backed securities 509.0 0.6 (21.7) 487.9 Other securities 1,279.9 7.2 (51.2) 1,235.9 Total available-for-sale securities 34,324.3 293.6 (944.8) 33,673.1 Total corporate investments and funds held for clients $ 37,115.8 $ 293.6 $ (944.8) $ 36,464.6 (A) Included within available-for-sale securities are corporate investments with fair values of $6,182.8 million and funds held for clients with fair values of $27,490.3 million. All available-for-sale securities were included in Level 2 of the fair value hierarchy. June 30, 2024 Amortized Gross Gross Fair Market Value (B) Type of issue: Money market securities, cash and other cash equivalents $ 10,086.0 $ — $ — $ 10,086.0 Available-for-sale securities: Corporate bonds 16,833.3 11.5 (944.8) 15,900.0 U.S. Treasury securities 7,701.2 9.0 (164.5) 7,545.7 Canadian government obligations and Canadian government agency obligations 2,130.7 1.7 (86.6) 2,045.8 U.S. government agency securities 1,645.0 0.5 (140.6) 1,504.9 Asset-backed securities 1,394.9 3.9 (43.0) 1,355.8 Canadian provincial bonds 1,116.3 2.3 (56.2) 1,062.4 Commercial mortgage-backed securities 535.9 — (35.1) 500.8 Other securities 1,366.0 2.0 (75.9) 1,292.1 Total available-for-sale securities 32,723.3 30.9 (1,546.7) 31,207.5 Total corporate investments and funds held for clients $ 42,809.3 $ 30.9 $ (1,546.7) $ 41,293.5
Summary of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value	The unrealized losses and fair values of available-for-sale securities that have been in an unrealized loss position for a period of less than and greater than 12 months as of September 30, 2024, are as follows: September 30, 2024 Securities in Unrealized Loss Position Less Than 12 Months Securities in Unrealized Loss Position Greater Than 12 Months Total Gross Fair Market Gross Fair Market Gross Fair Corporate bonds $ (2.4) $ 346.9 $ (576.2) $ 12,170.6 $ (578.6) $ 12,517.5 U.S. Treasury securities (5.5) 77.9 (76.2) 3,172.5 (81.7) 3,250.4 Canadian government obligations and Canadian government agency obligations — 1.4 (52.2) 1,607.2 (52.2) 1,608.6 U.S. government agency securities — 0.8 (98.2) 1,384.3 (98.2) 1,385.1 Asset-backed securities (0.4) 96.1 (25.2) 624.0 (25.6) 720.1 Canadian provincial bonds — 1.1 (35.6) 661.2 (35.6) 662.3 Commercial mortgage-backed securities (0.3) 15.3 (21.4) 460.1 (21.7) 475.4 Other securities (6.2) 118.9 (45.0) 719.1 (51.2) 838.0 $ (14.8) $ 658.4 $ (930.0) $ 20,799.0 $ (944.8) $ 21,457.4 The unrealized losses and fair values of available-for-sale securities that have been in an unrealized loss position for a period of less than and greater than 12 months as of June 30, 2024, are as follows: June 30, 2024 Securities in Unrealized Loss Position Less Than 12 Months Securities in Unrealized Loss Position Greater Than 12 Months Total Gross Fair Market Gross Fair Market Gross Fair Corporate bonds $ (25.8) $ 2,173.6 $ (919.0) $ 12,413.4 $ (944.8) $ 14,587.0 U.S. Treasury securities (23.1) 2,186.2 (141.4) 4,076.9 (164.5) 6,263.1 Canadian government obligations and Canadian government agency obligations (0.9) 304.6 (85.7) 1,591.6 (86.6) 1,896.2 U.S. government agency securities (0.7) 51.5 (139.9) 1,428.2 (140.6) 1,479.7 Asset-backed securities (2.3) 351.4 (40.7) 668.0 (43.0) 1,019.4 Canadian provincial bonds (1.3) 193.0 (54.9) 717.4 (56.2) 910.4 Commercial mortgage-backed securities (0.5) 11.2 (34.6) 489.6 (35.1) 500.8 Other securities (12.2) 288.5 (63.7) 864.8 (75.9) 1,153.3 $ (66.8) $ 5,560.0 $ (1,479.9) $ 22,249.9 $ (1,546.7) $ 27,809.9
Classification of Corporate Investments on the Consolidated Balance Sheets	Classification of corporate investments on the Consolidated Balance Sheets is as follows: September 30, June 30, 2024 2024 Corporate investments: Cash and cash equivalents $ 2,104.9 $ 2,913.4 Short-term marketable securities 5,242.2 384.0 Long-term marketable securities 940.6 — Total corporate investments $ 8,287.7 $ 3,297.4
Schedule of Investment of Funds Held for Clients	Funds held for clients have been invested in the following categories: September 30, June 30, 2024 2024 Funds held for clients: Restricted cash and cash equivalents held to satisfy client funds obligations $ 686.6 $ 7,172.6 Restricted short-term marketable securities held to satisfy client funds obligations 1,211.8 5,538.1 Restricted long-term marketable securities held to satisfy client funds obligations 26,278.5 25,285.4 Total funds held for clients $ 28,176.9 $ 37,996.1
Schedule of Expected Maturities of Available-for-Sale Securities	Expected maturities of available-for-sale securities at September 30, 2024 are as follows: One year or less $ 6,454.0 One year to two years 7,883.9 Two years to three years 4,589.9 Three years to four years 5,437.6 After four years 9,307.7 Total available-for-sale securities $ 33,673.1

Leases (Tables)

Leases (Tables)	3 Months Ended
Leases (Tables)	Sep. 30, 2024
Leases [Abstract]
Schedule of Lease Cost	The components of operating lease expense were as follows: Three Months Ended September 30, 2024 2023 Operating lease cost $ 27.5 $ 34.0 Short-term lease cost 0.3 0.5 Variable lease cost 6.6 3.2 Total operating lease cost $ 34.4 $ 37.7 The following table provides supplemental cash flow information related to the Company's leases: Three Months Ended September 30, 2024 2023 Cash paid for operating lease liabilities $ 28.8 $ 30.5 Operating lease ROU assets obtained in exchange for new operating lease liabilities $ 13.7 $ 26.9 Other information related to our operating lease liabilities is as follows: September 30, June 30, 2024 2024 Weighted-average remaining lease term (in years) 5 5 Weighted-average discount rate 3.3 % 3.3 % Current operating lease liability $ 96.0 $ 92.2
Schedule of Lessee, Operating Lease, Liability, Maturity	As of September 30, 2024, maturities of operating lease liabilities are as follows: Nine months ending June 30, 2025 $ 82.4 Twelve months ending June 30, 2026 98.5 Twelve months ending June 30, 2027 85.2 Twelve months ending June 30, 2028 64.7 Twelve months ending June 30, 2029 42.2 Thereafter 76.9 Total undiscounted lease obligations 449.9 Less: Imputed interest (37.8) Net lease obligations $ 412.1

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets, net (Tables)	3 Months Ended
Goodwill and Intangible Assets, net (Tables)	Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Changes in Goodwill	Changes in goodwill for the three months ended September 30, 2024 are as follows: Employer PEO Total Balance at June 30, 2024 $ 2,348.8 $ 4.8 $ 2,353.6 Currency translation adjustments 15.4 — 15.4 Balance at September 30, 2024 $ 2,364.2 $ 4.8 $ 2,369.0
Schedule of Components of Finite-Lived Intangible Assets	Components of intangible assets, net, are as follows: September 30, June 30, 2024 2024 Intangible assets: Software and software licenses $ 3,874.3 $ 3,803.7 Customer contracts and lists 1,192.9 1,181.6 Other intangibles 242.2 242.0 5,309.4 5,227.3 Less accumulated amortization: Software and software licenses (2,707.0) (2,642.6) Customer contracts and lists (1,030.5) (1,007.6) Other intangibles (241.6) (241.1) (3,979.1) (3,891.3) Intangible assets, net $ 1,330.3 $ 1,336.0
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	Estimated future amortization expenses of the Company's existing intangible assets are as follows: Amount Nine months ending June 30, 2025 $ 327.7 Twelve months ending June 30, 2026 $ 265.5 Twelve months ending June 30, 2027 $ 195.1 Twelve months ending June 30, 2028 $ 152.2 Twelve months ending June 30, 2029 $ 124.0 Twelve months ending June 30, 2030 $ 86.0

Short-term Financing (Tables)

Short-term Financing (Tables)	3 Months Ended
Short-term Financing (Tables)	Sep. 30, 2024
Debt Disclosure [Abstract]
Schedule of Borrowings under Commercial Paper Program	Details of the borrowings under the commercial paper program are as follows: Three Months Ended September 30, 2024 2023 Average daily borrowings (in billions) $ 4.8 $ 4.1 Weighted average interest rates 5.3 % 5.3 % Weighted average maturity (approximately in days) 2 days 2 days
Schedule of Reverse Repurchase Agreements	Details of the reverse repurchase agreements are as follows: Three Months Ended September 30, 2024 2023 Average outstanding balances (in billions) $ 3.8 $ 1.4 Weighted average interest rates 5.3 % 5.3 %

Debt (Tables)

Debt (Tables)	3 Months Ended
Debt (Tables)	Sep. 30, 2024
Debt Disclosure [Abstract]
Schedule of Long Term Debt	The principal amounts and associated effective interest rates of the Notes and other debt as of September 30, 2024 and June 30, 2024, are as follows: Debt instrument Effective Interest Rate September 30, 2024 June 30, 2024 Fixed-rate 3.375% notes due September 15, 2025 3.47% $ 1,000.0 $ 1,000.0 Fixed-rate 1.700% notes due May 15, 2028 1.85% 1,000.0 1,000.0 Fixed-rate 1.250% notes due September 1, 2030 1.83% 1,000.0 1,000.0 Fixed-rate 4.450% notes due September 9, 2034 4.75% 1,000.0 — Other 3.7 4.1 4,003.7 3,004.1 Less: current portion (1,000.3) (1.1) Less: unamortized discount and debt issuance costs (22.0) (11.7) Total long-term debt $ 2,981.4 $ 2,991.3

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	3 Months Ended
Employee Benefit Plans (Tables)	Sep. 30, 2024
Retirement Benefits [Abstract]
Summary of Components of Stock-Based Compensation Expense	The following table represents pre-tax stock-based compensation expense for the three months ended September 30, 2024 and 2023, respectively: Three Months Ended September 30, 2024 2023 Operating expenses $ 9.1 $ 7.4 Selling, general and administrative expenses 42.3 42.8 Research and development 9.2 8.6 Total stock-based compensation expense $ 60.6 $ 58.8 During the three months ended September 30, 2024, the following activity occurred under the Company’s existing plans.
Summary of Changes in Stock Options Outstanding	Stock Options: Number Weighted Options outstanding at July 1, 2024 2,042 $ 159 Options granted — $ — Options exercised (498) $ 162 Options forfeited/cancelled — $ — Options outstanding at September 30, 2024 1,544 $ 158
Summary of Time Based Restricted Shares and Units	Time-Based Restricted Stock and Time-Based Restricted Stock Units: Number of Shares Number of Units Restricted shares/units outstanding at July 1, 2024 124 1,053 Restricted shares/units granted — 578 Restricted shares/units vested (114) (418) Restricted shares/units forfeited — (11) Restricted shares/units outstanding at September 30, 2024 10 1,202
Summary of Performance Based Restricted shares and units	Performance-Based Restricted Stock and Performance-Based Restricted Stock Units: Number of Shares Number of Units Restricted shares/units outstanding at July 1, 2024 88 753 Restricted shares/units granted — 293 Restricted shares/units vested (58) (293) Restricted shares/units forfeited (2) (2) Restricted shares/units outstanding at September 30, 2024 28 751
Summary of Net Benefit Costs	The components of net pension income were as follows: Three Months Ended September 30, 2024 2023 Service cost – benefits earned during the period $ 1.5 $ 1.3 Interest cost on projected benefits 21.9 21.2 Expected return on plan assets (29.0) (29.0) Net amortization and deferral 0.7 0.7 Net pension (income)/expense $ (4.9) $ (5.8)

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	3 Months Ended
Stockholders' Equity (Tables)	Sep. 30, 2024
Equity [Abstract]
Schedule of Components of Stockholders' Equity	Changes in stockholders' equity by component are as follows: Three Months Ended September 30, 2024 Common Stock Capital in Excess of Par Value Retained Earnings Treasury Stock AOCI Total Balance at June 30, 2024 $ 63.9 $ 2,406.9 $ 23,622.2 $ (19,737.1) $ (1,808.3) $ 4,547.6 Net earnings — — 956.3 — — 956.3 Other comprehensive income — — — — 708.1 708.1 Stock-based compensation expense — 54.8 — — — 54.8 Issuances relating to stock compensation plans — 66.9 — 49.7 — 116.6 Treasury stock acquired (1.4 million shares repurchased) — — — (457.5) — (457.5) Dividends declared ($1.40 per share) — — (577.3) — — (577.3) Balance at September 30, 2024 $ 63.9 $ 2,528.6 $ 24,001.2 $ (20,144.9) $ (1,100.2) $ 5,348.6 Three Months Ended September 30, 2023 Common Stock Capital in Excess of Par Value Retained Earnings Treasury Stock AOCI Total Balance at June 30, 2023 $ 63.9 $ 2,102.3 $ 22,118.0 $ (18,469.3) $ (2,305.8) $ 3,509.1 Net earnings — — 859.4 — — 859.4 Other comprehensive income — — — — (162.0) (162.0) Stock-based compensation expense — 54.0 — — — 54.0 Issuances relating to stock compensation plans — 32.4 — 49.4 — 81.8 Treasury stock acquired (1.0 million shares repurchased) — — — (347.5) — (347.5) Dividends declared ($1.25 per share) — — (522.0) — — (522.0) Balance at September 30, 2023 $ 63.9 $ 2,188.7 $ 22,455.4 $ (18,767.4) $ (2,467.8) $ 3,472.8

Reclassifications out of Accu_2

Reclassifications out of Accumulated Other Comprehensive Income (“AOCI”) (Tables)	3 Months Ended
	Sep. 30, 2024
Equity [Abstract]
Schedule of Reclassification out of Accumulated Other Comprehensive Income	Changes in AOCI by component are as follows: Three Months Ended September 30, 2024 Currency Translation Adjustment Net Gains/Losses on Available-for-sale Securities Cash Flow Hedging Activities Pension Liability Accumulated Other Comprehensive (Loss) /Income Balance at June 30, 2024 $ (378.8) $ (1,178.0) $ (20.0) $ (231.5) $ (1,808.3) Other comprehensive income/(loss) before reclassification adjustments 49.2 864.4 (12.5) — 901.1 Tax effect — (197.9) 3.1 — (194.8) Reclassification adjustments to net earnings — 0.2 (A) 1.1 (C) 1.1 (B) 2.4 Tax effect — — (0.3) (0.3) (0.6) Balance at September 30, 2024 $ (329.6) $ (511.3) $ (28.6) $ (230.7) $ (1,100.2) Three Months Ended September 30, 2023 Currency Translation Adjustment Net Gains/Losses on Available-for-sale Securities Cash Flow Hedging Activities Pension Liability Accumulated Other Comprehensive (Loss) /Income Balance at June 30, 2023 $ (340.8) $ (1,705.6) $ (23.3) $ (236.1) $ (2,305.8) Other comprehensive income/(loss) before reclassification adjustments (44.6) (150.6) — — (195.2) Tax effect — 30.1 — — 30.1 Reclassification adjustments to net earnings — 1.9 (A) 1.1 (C) 1.0 (B) 4.0 Tax effect — (0.4) (0.3) (0.2) (0.9) Balance at September 30, 2023 $ (385.4) $ (1,824.6) $ (22.5) $ (235.3) $ (2,467.8) (A) Reclassification adjustments out of AOCI are included within Other (income)/expense, net, on the Statements of Consolidated Earnings. (B) Reclassification adjustments out of AOCI are included in net pension (income)/expense (see Note 11). (C) Reclassification adjustments out of AOCI are included in Interest expense on the Statements of Consolidated Earnings (see Note 10).

Interim Financial Data by Seg_2

Interim Financial Data by Segment (Tables)	3 Months Ended
Interim Financial Data by Segment (Tables)	Sep. 30, 2024
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	Segment Results: Revenues Three Months Ended September 30, 2024 2023 Employer Services $ 3,261.0 $ 3,046.4 PEO Services 1,574.5 1,469.6 Other (2.8) (3.6) $ 4,832.7 $ 4,512.4 Earnings before Income Taxes Three Months Ended September 30, 2024 2023 Employer Services $ 1,164.3 $ 1,008.5 PEO Services 225.6 222.9 Other (153.7) (138.6) $ 1,236.2 $ 1,092.8

Revenue - Narrative (Details)

Revenue - Narrative (Details)	Sep. 30, 2024 pillar
Revenue from Contract with Customer [Abstract]
Number of strategic pillars	3

Revenue - Disaggregation of Rev

Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 4,832.7	$ 4,512.4
Other
Disaggregation of Revenue [Line Items]
Revenues	(2.8)	(3.6)
Employer Services \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	3,261	3,046.4
PEO Services \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	1,574.5	1,469.6
Other \| Other
Disaggregation of Revenue [Line Items]
Revenues	(2.8)	(3.6)
HCM
Disaggregation of Revenue [Line Items]
Revenues	2,025.4	1,914.4
HCM \| Employer Services \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	2,027.6	1,916.7
HCM \| PEO Services \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	0	0
HCM \| Other \| Other
Disaggregation of Revenue [Line Items]
Revenues	(2.2)	(2.3)
HRO, excluding PEO zero-margin benefits pass-throughs
Disaggregation of Revenue [Line Items]
Revenues	865.2	811.7
HRO, excluding PEO zero-margin benefits pass-throughs \| Employer Services \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	342.8	322
HRO, excluding PEO zero-margin benefits pass-throughs \| PEO Services \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	523	491
HRO, excluding PEO zero-margin benefits pass-throughs \| Other \| Other
Disaggregation of Revenue [Line Items]
Revenues	(0.6)	(1.3)
PEO zero-margin benefits pass-throughs
Disaggregation of Revenue [Line Items]
Revenues	1,049.2	976.7
PEO zero-margin benefits pass-throughs \| Employer Services \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	0	0
PEO zero-margin benefits pass-throughs \| PEO Services \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	1,049.2	976.7
PEO zero-margin benefits pass-throughs \| Other \| Other
Disaggregation of Revenue [Line Items]
Revenues	0	0
Global
Disaggregation of Revenue [Line Items]
Revenues	639.6	607.9
Global \| Employer Services \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	639.6	607.9
Global \| PEO Services \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	0	0
Global \| Other \| Other
Disaggregation of Revenue [Line Items]
Revenues	0	0
Interest on funds held for clients
Disaggregation of Revenue [Line Items]
Revenues	253.3	201.7
Interest on funds held for clients \| Employer Services \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	251	199.8
Interest on funds held for clients \| PEO Services \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	2.3	1.9
Interest on funds held for clients \| Other \| Other
Disaggregation of Revenue [Line Items]
Revenues	$ 0	$ 0

Revenue - Contract Liability (D

Revenue - Contract Liability (Details) $ in Millions	3 Months Ended
Revenue - Contract Liability (Details) $ in Millions	Sep. 30, 2024 USD ($)
Contract Liability
Contract liability, July 1, 2024	$ 491.6
Recognition of revenue included in beginning of year contract liability	(35.9)
Contract liability, net of revenue recognized on contracts during the period	28
Currency translation adjustments	10.8
Contract liability, September 30, 2024	$ 494.5

Earnings per Share (_EPS_) - Sc

Earnings per Share (“EPS”) - Schedule of Earnings per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share [Abstract]
Net earnings	$ 956.3	$ 859.4
Basic, Weighted average shares (in shares)	407.9	411.7
Effect of Employee Stock Option Shares (in shares)	0.7	0.9
Effect of Employee Restricted Stock Shares (in shares)	0.9	1
Diluted, Weighted average shares (in shares)	409.5	413.6
Basic, EPS (in USD per share)	$ 2.34	$ 2.09
Diluted, EPS (in USD per share)	$ 2.34	$ 2.08

Earnings per Share (_EPS_) - Na

Earnings per Share (“EPS”) - Narrative (Details) - shares	3 Months Ended
Earnings per Share (“EPS”) - Narrative (Details) - shares	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share [Abstract]
Options excluded from the calculation of diluted earnings per share (in shares)	0	0

Other (Income)_Expense, Net (De

Other (Income)/Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Other Income and Expenses [Abstract]
Interest income on corporate funds	$ (91.7)	$ (46.5)
Realized losses on available-for-sale securities, net	0.2	1.9
Gain on sale of assets	(2.4)	(14.6)
Non-service components of pension income, net	(7.8)	(8.5)
Other (income)/expense, net	$ (101.7)	$ (67.7)

Corporate Investments and Fun_3

Corporate Investments and Funds Held for Clients - Corporate Investments and Funds Held for Clients (Details) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2023
Debt Securities, Available-for-sale [Line Items]
Money market securities, cash and other cash equivalents - amortized cost	$ 2,104.9	$ 2,913.4	$ 1,441.4
Amortized Cost	34,324.3	32,723.3
Gross unrealized gains	293.6	30.9
Gross unrealized losses	(944.8)	(1,546.7)
Fair market value	33,673.1	31,207.5
Total corporate investments and funds held for clients - amortized cost	37,115.8	42,809.3
Total corporate investments and funds held for clients - gross unrealized gains	293.6	30.9
Total corporate investments and funds held for clients - gross unrealized losses	(944.8)	(1,546.7)
Total corporate investments and funds held for clients - fair market value	36,464.6	41,293.5
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	17,705.4	16,833.3
Gross unrealized gains	129	11.5
Gross unrealized losses	(578.6)	(944.8)
Fair market value	17,255.8	15,900
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	8,197.1	7,701.2
Gross unrealized gains	94.8	9
Gross unrealized losses	(81.7)	(164.5)
Fair market value	8,210.2	7,545.7
Canadian government obligations and Canadian government agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,295.7	2,130.7
Gross unrealized gains	18.2	1.7
Gross unrealized losses	(52.2)	(86.6)
Fair market value	2,261.7	2,045.8
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,582.4	1,645
Gross unrealized gains	3.7	0.5
Gross unrealized losses	(98.2)	(140.6)
Fair market value	1,487.9	1,504.9
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,614.4	1,394.9
Gross unrealized gains	22.6	3.9
Gross unrealized losses	(25.6)	(43)
Fair market value	1,611.4	1,355.8
Canadian provincial bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,140.4	1,116.3
Gross unrealized gains	17.5	2.3
Gross unrealized losses	(35.6)	(56.2)
Fair market value	1,122.3	1,062.4
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	509	535.9
Gross unrealized gains	0.6	0
Gross unrealized losses	(21.7)	(35.1)
Fair market value	487.9	500.8
Other securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,279.9	1,366
Gross unrealized gains	7.2	2
Gross unrealized losses	(51.2)	(75.9)
Fair market value	1,235.9	1,292.1
Corporate Investments
Debt Securities, Available-for-sale [Line Items]
Fair market value	6,182.8	384
Funds Held For Clients
Debt Securities, Available-for-sale [Line Items]
Fair market value	27,490.3	30,823.5
Money market securities, cash and other cash equivalents
Debt Securities, Available-for-sale [Line Items]
Money market securities, cash and other cash equivalents - amortized cost	2,791.5	10,086
Money market securities and other cash equivalents - fair market value	$ 2,791.5	$ 10,086

Corporate Investments and Fun_4

Corporate Investments and Funds Held for Clients - Narrative (Details) - USD ($)	3 Months Ended
	Sep. 30, 2024	Jun. 30, 2024
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	$ 33,673,100,000	$ 31,207,500,000
Client fund obligation repayment period	1 year
Client funds obligations	$ 28,720,900,000	39,503,900,000
Client funds held in grantor trust	$ 25,338,300,000	34,940,000,000
Client funds investments with original maturities	90 years
Fair Value, Inputs, Level 1
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	$ 0
Fair Value, Inputs, Level 3
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	0
Asset-Backed Auto Loan Receivables
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	759,500,000
Fixed Rate Credit Card
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	486,800,000
Asset-Backed Equipment Lease Receivable
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	189,500,000
Federal Farm Credit Banks
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	969,000,000
Federal Home Loan Banks
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	482,200,000
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	487,900,000	$ 500,800,000
Municipal Bonds
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	543,200,000
Debt Security, Corporate, Non-US
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	313,000,000
Supranational Bonds
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	$ 218,300,000

Corporate Investments and Fun_5

Corporate Investments and Funds Held for Clients - Available-For-Sale Securities that Have Been in an Unrealized Loss Position (Details) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024
Debt Securities, Available-for-sale [Line Items]
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses	$ (14.8)	$ (66.8)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value	658.4	5,560
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses	(930)	(1,479.9)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value	20,799	22,249.9
Total, Gross Unrealized Losses	(944.8)	(1,546.7)
Total, Fair Market Value	21,457.4	27,809.9
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses	(2.4)	(25.8)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value	346.9	2,173.6
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses	(576.2)	(919)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value	12,170.6	12,413.4
Total, Gross Unrealized Losses	(578.6)	(944.8)
Total, Fair Market Value	12,517.5	14,587
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses	(5.5)	(23.1)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value	77.9	2,186.2
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses	(76.2)	(141.4)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value	3,172.5	4,076.9
Total, Gross Unrealized Losses	(81.7)	(164.5)
Total, Fair Market Value	3,250.4	6,263.1
Canadian government obligations and Canadian government agency obligations
Debt Securities, Available-for-sale [Line Items]
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses	0	(0.9)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value	1.4	304.6
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses	(52.2)	(85.7)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value	1,607.2	1,591.6
Total, Gross Unrealized Losses	(52.2)	(86.6)
Total, Fair Market Value	1,608.6	1,896.2
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses	0	(0.7)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value	0.8	51.5
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses	(98.2)	(139.9)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value	1,384.3	1,428.2
Total, Gross Unrealized Losses	(98.2)	(140.6)
Total, Fair Market Value	1,385.1	1,479.7
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses	(0.4)	(2.3)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value	96.1	351.4
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses	(25.2)	(40.7)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value	624	668
Total, Gross Unrealized Losses	(25.6)	(43)
Total, Fair Market Value	720.1	1,019.4
Canadian provincial bonds
Debt Securities, Available-for-sale [Line Items]
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses	0	(1.3)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value	1.1	193
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses	(35.6)	(54.9)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value	661.2	717.4
Total, Gross Unrealized Losses	(35.6)	(56.2)
Total, Fair Market Value	662.3	910.4
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses	(0.3)	(0.5)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value	15.3	11.2
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses	(21.4)	(34.6)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value	460.1	489.6
Total, Gross Unrealized Losses	(21.7)	(35.1)
Total, Fair Market Value	475.4	500.8
Other securities
Debt Securities, Available-for-sale [Line Items]
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses	(6.2)	(12.2)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value	118.9	288.5
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses	(45)	(63.7)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value	719.1	864.8
Total, Gross Unrealized Losses	(51.2)	(75.9)
Total, Fair Market Value	$ 838	$ 1,153.3

Corporate Investments and Fun_6

Corporate Investments and Funds Held for Clients - Classification of Corporate Investments on the Consolidated Balance Sheets (Details) - USD ($) $ in Millions		Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]
Cash and cash equivalents		$ 2,104.9	$ 2,913.4	$ 1,441.4
Short-term marketable securities	[1]	5,242.2	384
Long-term marketable securities	[1]	940.6	0
Total corporate investments		$ 8,287.7	$ 3,297.4

[1]As of September 30, 2024, $578.6 million of short-term marketable securities, $98.8 million of long-term marketable securities and $1.7 million of cash and cash equivalents have been pledged as collateral under the Company's reverse repurchase agreements. As of June 30, 2024, $384.0 million of short-term marketable securities and $1.4 million of cash and cash equivalents have been pledged as collateral under the Company's reverse repurchase agreements (see Note 9).

Corporate Investments and Fun_7

Corporate Investments and Funds Held for Clients - Schedule of Investment of Funds Held for Clients (Details) - USD ($) $ in Millions	Sep. 30, 2024		Jun. 30, 2024	Sep. 30, 2023	[1]
Debt Securities, Available-for-sale [Line Items]
Restricted cash and cash equivalents held to satisfy client funds obligations	$ 686.6	[1]	$ 7,172.6	$ 5,520.5
Total funds held for clients	28,176.9		37,996.1
Current
Debt Securities, Available-for-sale [Line Items]
Restricted short-term and long term marketable securities held to satisfy client funds obligations	1,211.8		5,538.1
Non-current
Debt Securities, Available-for-sale [Line Items]
Restricted short-term and long term marketable securities held to satisfy client funds obligations	$ 26,278.5		$ 25,285.4

[1]See Note 6 for a reconciliation of restricted cash and restricted cash equivalents in funds held for clients on the Consolidated Balance Sheets.

Corporate Investments and Fun_8

Corporate Investments and Funds Held for Clients - Expected Maturities of Available-For-Sale Securities (Details) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract]
One year or less	$ 6,454
One year to two years	7,883.9
Two years to three years	4,589.9
Three years to four years	5,437.6
After four years	9,307.7
Total available-for-sale securities	$ 33,673.1	$ 31,207.5

Leases - Narrative (Details)

Leases - Narrative (Details)	Sep. 30, 2024	Jun. 30, 2024
Leases [Abstract]
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued expenses and other current liabilities	Accrued expenses and other current liabilities
Remaining lease term	11 years

Leases - Lease Cost (Details)

Leases - Lease Cost (Details) - USD ($) $ in Millions	3 Months Ended
Leases - Lease Cost (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Leases [Abstract]
Operating lease cost	$ 27.5	$ 34
Short-term lease cost	0.3	0.5
Variable lease cost	6.6	3.2
Total operating lease cost	$ 34.4	$ 37.7

Leases - Right of Use Assets an

Leases - Right of Use Assets and Operating Lease Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024
Leases [Abstract]
Cash paid for operating lease liabilities	$ 28.8	$ 30.5
Operating lease ROU assets obtained in exchange for new operating lease liabilities	$ 13.7	$ 26.9
Weighted-average remaining lease term (in years)	5 years		5 years
Weighted-average discount rate	3.30%		3.30%
Current operating lease liability	$ 96		$ 92.2

Leases - Operating Lease Maturi

Leases - Operating Lease Maturities (Details) $ in Millions	Sep. 30, 2024 USD ($)
Leases [Abstract]
Nine months ending June 30, 2025	$ 82.4
Twelve months ending June 30, 2026	98.5
Twelve months ending June 30, 2027	85.2
Twelve months ending June 30, 2028	64.7
Twelve months ending June 30, 2029	42.2
Thereafter	76.9
Total undiscounted lease obligations	449.9
Less: Imputed interest	(37.8)
Net lease obligations	$ 412.1

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets, net - Changes in Goodwill (Details) $ in Millions	3 Months Ended
	Sep. 30, 2024 USD ($)
Goodwill [Roll Forward]
Balance at June 30, 2024	$ 2,353.6
Currency translation adjustments	15.4
Balance at September 30, 2024	2,369
Employer Services
Goodwill [Roll Forward]
Balance at June 30, 2024	2,348.8
Currency translation adjustments	15.4
Balance at September 30, 2024	2,364.2
PEO Services
Goodwill [Roll Forward]
Balance at June 30, 2024	4.8
Currency translation adjustments	0
Balance at September 30, 2024	$ 4.8

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets, net - Components of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 5,309.4	$ 5,227.3
Intangible assets, accumulated amortization	(3,979.1)	(3,891.3)
Intangible assets, net	1,330.3	1,336
Software and software licenses
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	3,874.3	3,803.7
Intangible assets, accumulated amortization	(2,707)	(2,642.6)
Customer contracts and lists
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	1,192.9	1,181.6
Intangible assets, accumulated amortization	(1,030.5)	(1,007.6)
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	242.2	242
Intangible assets, accumulated amortization	$ (241.6)	$ (241.1)

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets, net - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining useful life	5 years
Amortization of intangible assets	$ 89	$ 95.7
Software and software licenses
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining useful life	6 years
Customer contracts and lists
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining useful life	3 years
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining useful life	1 year

Goodwill and Intangible Asset_6

Goodwill and Intangible Assets, net - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details) $ in Millions	Sep. 30, 2024 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Nine months ending June 30, 2025	$ 327.7
Twelve months ending June 30, 2026	265.5
Twelve months ending June 30, 2027	195.1
Twelve months ending June 30, 2028	152.2
Twelve months ending June 30, 2029	124
Twelve months ending June 30, 2030	$ 86

Short-term Financing - Narrativ

Short-term Financing - Narrative (Details) - USD ($)		3 Months Ended
Short-term Financing - Narrative (Details) - USD ($)		Sep. 30, 2024	Jun. 30, 2024
Short-term Debt [Line Items]
Line of credit facility, fair value of amount outstanding		$ 0
Commercial paper		$ 4,375,400,000	$ 0
Maturities of short-term funding agreements (up to)		5 days
Obligations under reverse repurchase agreements	[1]	$ 679,100,000	$ 385,400,000
Aggregate committed obligations under reverse repurchase agreements		7,300,000,000
364-day credit agreement
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities		$ 4,550,000,000
Term of credit		364 days
Extension option term		1 year
Credit Facility Expiring In June 2028
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities		$ 2,250,000,000
Term of credit		5 years
Line of credit facility potentially available increase in maximum borrowing capacity		$ 500,000,000
Credit Facility Expiring In June 2029
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities		$ 3,500,000,000
Term of credit		5 years
Line of credit facility potentially available increase in maximum borrowing capacity		$ 500,000,000
Commercial paper program
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities		$ 10,300,000,000
Debt instrument, maturity period		364 days

[1]As of September 30, 2024, $578.6 million of short-term marketable securities, $98.8 million of long-term marketable securities and $1.7 million of cash and cash equivalents have been pledged as collateral under the Company's reverse repurchase agreements. As of June 30, 2024, $384.0 million of short-term marketable securities and $1.4 million of cash and cash equivalents have been pledged as collateral under the Company's reverse repurchase agreements (see Note 9).

Short-term Financing - Commerci

Short-term Financing - Commercial Paper Program and Reverse Repurchase Agreements (Details) - USD ($) $ in Billions	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Commercial paper program
Short-term Debt [Line Items]
Average outstanding balances (in billions)	$ 4.8	$ 4.1
Weighted average interest rates	5.30%	5.30%
Weighted average maturity (approximately in days)	2 days	2 days
Reverse repurchase agreements
Short-term Debt [Line Items]
Average outstanding balances (in billions)	$ 3.8	$ 1.4
Weighted average interest rates	5.30%	5.30%

Debt - Narrative (Details)

Debt - Narrative (Details) $ in Millions	3 Months Ended
Debt - Narrative (Details) $ in Millions	Sep. 30, 2024 USD ($) note	Sep. 30, 2023 USD ($)
Debt Instrument [Line Items]
Number of fixed rate notes issued \| note	4
Debt face amount	$ 4,000
Notional amount of derivatives terminated	1,000
Unamortized loss on cash flow hedges	12.5	$ 0
Fair value of notes issued	3,779.3
Derivative Instrument, Termination One
Debt Instrument [Line Items]
Notional amount of derivatives terminated	400
Derivative Instrument, Termination Two
Debt Instrument [Line Items]
Notional amount of derivatives terminated	600
Fixed-rate 4.450% notes due September 9, 2034 \| Senior Notes
Debt Instrument [Line Items]
Debt face amount	$ 1,000
Stated interest rate	4.45%
Minimum
Debt Instrument [Line Items]
Debt instrument, term	7 years
Maximum
Debt Instrument [Line Items]
Debt instrument, term	10 years

Debt - Schedule of Long Term De

Debt - Schedule of Long Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024
Debt Instrument [Line Items]
Notes payable	$ 4,003.7	$ 3,004.1
Less: current portion	(1,000.3)	(1.1)
Less: unamortized discount and debt issuance costs	(22)	(11.7)
Long-term debt	$ 2,981.4	2,991.3
Fixed-rate 3.375% notes due September 15, 2025
Debt Instrument [Line Items]
Stated interest rate	3.375%
Debt instrument effective rate (in percent)	3.47%
Notes payable	$ 1,000	1,000
Fixed-rate 1.700% notes due May 15, 2028
Debt Instrument [Line Items]
Stated interest rate	1.70%
Debt instrument effective rate (in percent)	1.85%
Notes payable	$ 1,000	1,000
Fixed-rate 1.250% notes due September 1, 2030
Debt Instrument [Line Items]
Stated interest rate	1.25%
Debt instrument effective rate (in percent)	1.83%
Notes payable	$ 1,000	1,000
Fixed-rate 4.450% notes due September 9, 2034 \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate	4.45%
Debt instrument effective rate (in percent)	4.75%
Notes payable	$ 1,000	0
Other
Debt Instrument [Line Items]
Notes payable	$ 3.7	$ 4.1

Employee Benefit Plans - Narrat

Employee Benefit Plans - Narrative (Details) - shares shares in Millions	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Treasury stock acquired (in shares)	1.4	1
Time-based restricted shares/units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting term options granted	3 years
Performance Based Restricted Stock Units \| Minimum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Performance period (in years)	1 year
Performance payout percentage	0%
Performance Based Restricted Stock Units \| Maximum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting term options granted	38 months
Performance period (in years)	3 years
Performance payout percentage	200%
Employee Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Purchase price of common stock as percentage of market value	95%

Employee Benefit Plans - Compon

Employee Benefit Plans - Components of Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Total pretax stock-based compensation expense	$ 60.6	$ 58.8
Operating expenses
Defined Benefit Plan Disclosure [Line Items]
Total pretax stock-based compensation expense	9.1	7.4
Selling, general and administrative expenses
Defined Benefit Plan Disclosure [Line Items]
Total pretax stock-based compensation expense	42.3	42.8
Research and development
Defined Benefit Plan Disclosure [Line Items]
Total pretax stock-based compensation expense	$ 9.2	$ 8.6

Employee Benefit Plans - Change

Employee Benefit Plans - Changes in Stock Options Outstanding (Details) shares in Thousands	3 Months Ended
	Sep. 30, 2024 $ / shares shares
Number of Options (in thousands)
Options outstanding at beginning of period (in shares) \| shares	2,042
Options granted (in shares) \| shares	0
Options exercised (in shares) \| shares	(498)
Options forfeited/cancelled (in shares) \| shares	0
Options outstanding at end of period (in shares) \| shares	1,544
Weighted Average Price (in dollars)
Weighted Average Price, beginning of period (in dollars per share) \| $ / shares	$ 159
Weighted Average Price, granted (in dollars per share) \| $ / shares	0
Weighted Average Price, exercised (in dollars per share) \| $ / shares	162
Weighted Average Price, forfeited/cancelled (in dollar per share) \| $ / shares	0
Weighted Average Price, end of period (in dollars per share) \| $ / shares	$ 158

Employee Benefit Plans - Time-B

Employee Benefit Plans - Time-Based Restricted Shares and Units (Details) shares in Thousands	3 Months Ended
	Sep. 30, 2024 shares
Time Based Restricted Stock
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted shares/units outstanding, beginning balance (in shares)	124
Restricted shares/units granted (in shares)	0
Restricted shares/units vested (in shares)	(114)
Restricted shares/units forfeited (in shares)	0
Restricted shares/units outstanding, ending balance (in shares)	10
Time Based restricted Stock Units
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted shares/units outstanding, beginning balance (in shares)	1,053
Restricted shares/units granted (in shares)	578
Restricted shares/units vested (in shares)	(418)
Restricted shares/units forfeited (in shares)	(11)
Restricted shares/units outstanding, ending balance (in shares)	1,202

Employee Benefit Plans - Perfor

Employee Benefit Plans - Performance Based Restricted Shares and Units (Details) shares in Thousands	3 Months Ended
	Sep. 30, 2024 shares
Performance Based Restricted Stock
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted shares/units outstanding, beginning balance (in shares)	88
Restricted shares/units granted (in shares)	0
Restricted shares/units vested (in shares)	(58)
Restricted shares/units forfeited (in shares)	(2)
Restricted shares/units outstanding, ending balance (in shares)	28
Performance Based Restricted Stock Unit
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted shares/units outstanding, beginning balance (in shares)	753
Restricted shares/units granted (in shares)	293
Restricted shares/units vested (in shares)	(293)
Restricted shares/units forfeited (in shares)	(2)
Restricted shares/units outstanding, ending balance (in shares)	751

Employee Benefit Plans - Comp_2

Employee Benefit Plans - Components of Net Pension (Income)/Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Retirement Benefits [Abstract]
Service cost – benefits earned during the period	$ 1.5	$ 1.3
Interest cost on projected benefits	21.9	21.2
Expected return on plan assets	(29)	(29)
Net amortization and deferral	0.7	0.7
Net pension (income)/expense	$ (4.9)	$ (5.8)

Income Taxes (Details)

Income Taxes (Details)	3 Months Ended
Income Taxes (Details)	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Effective income tax rate	22.60%	21.40%

Stockholders' Equity (Details)

Stockholders' Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Class of Stock [Line Items]
Treasury stock acquired (in shares)	1.4	1
Dividends declared (in USD per share)	$ 1.40	$ 1.25
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 4,547.6	$ 3,509.1
Net earnings	956.3	859.4
Other comprehensive income	708.1	(162)
Stock-based compensation expense	54.8	54
Issuances relating to stock compensation plans	116.6	81.8
Treasury stock acquired	(457.5)	(347.5)
Dividends declared	(577.3)	(522)
Ending balance	5,348.6	3,472.8
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	63.9	63.9
Ending balance	63.9	63.9
Capital in Excess of Par Value
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	2,406.9	2,102.3
Stock-based compensation expense	54.8	54
Issuances relating to stock compensation plans	66.9	32.4
Ending balance	2,528.6	2,188.7
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	23,622.2	22,118
Net earnings	956.3	859.4
Dividends declared	(577.3)	(522)
Ending balance	24,001.2	22,455.4
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(19,737.1)	(18,469.3)
Issuances relating to stock compensation plans	49.7	49.4
Treasury stock acquired	(457.5)	(347.5)
Ending balance	(20,144.9)	(18,767.4)
AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,808.3)	(2,305.8)
Other comprehensive income	708.1	(162)
Ending balance	$ (1,100.2)	$ (2,467.8)

Reclassifications out of Accu_3

Reclassifications out of Accumulated Other Comprehensive Income (“AOCI”) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 4,547.6	$ 3,509.1
Other comprehensive income/(loss) before reclassification adjustments	901.1	(195.2)
Tax effect	(194.8)	30.1
Reclassification adjustments to net earnings	2.4	4
Tax effect	(0.6)	(0.9)
Ending balance	5,348.6	3,472.8
Accumulated Other Comprehensive (Loss) /Income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,808.3)	(2,305.8)
Ending balance	(1,100.2)	(2,467.8)
Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(378.8)	(340.8)
Other comprehensive income/(loss) before reclassification adjustments	49.2	(44.6)
Tax effect	0	0
Reclassification adjustments to net earnings	0	0
Tax effect	0	0
Ending balance	(329.6)	(385.4)
Net Gains/Losses on Available-for-sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,178)	(1,705.6)
Other comprehensive income/(loss) before reclassification adjustments	864.4	(150.6)
Tax effect	(197.9)	30.1
Reclassification adjustments to net earnings	0.2	1.9
Tax effect	0	(0.4)
Ending balance	(511.3)	(1,824.6)
Cash Flow Hedging Activities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(20)	(23.3)
Other comprehensive income/(loss) before reclassification adjustments	(12.5)	0
Tax effect	3.1	0
Reclassification adjustments to net earnings	1.1	1.1
Tax effect	(0.3)	(0.3)
Ending balance	(28.6)	(22.5)
Pension Liability
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(231.5)	(236.1)
Other comprehensive income/(loss) before reclassification adjustments	0	0
Tax effect	0	0
Reclassification adjustments to net earnings	1.1	1
Tax effect	(0.3)	(0.2)
Ending balance	$ (230.7)	$ (235.3)

Interim Financial Data by Seg_3

Interim Financial Data by Segment - Narrative (Details)	3 Months Ended
Interim Financial Data by Segment - Narrative (Details)	Sep. 30, 2024 segment
Segment Reporting [Abstract]
Number of reportable segments	2

Interim Financial Data by Seg_4

Interim Financial Data by Segment - Financial Data By Strategic Business Unit Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Revenues	$ 4,832.7	$ 4,512.4
Earnings before Income Taxes	1,236.2	1,092.8
Other
Segment Reporting Information [Line Items]
Revenues	(2.8)	(3.6)
Earnings before Income Taxes	(153.7)	(138.6)
Employer Services \| Operating Segments
Segment Reporting Information [Line Items]
Revenues	3,261	3,046.4
Earnings before Income Taxes	1,164.3	1,008.5
PEO Services \| Operating Segments
Segment Reporting Information [Line Items]
Revenues	1,574.5	1,469.6
Earnings before Income Taxes	$ 225.6	$ 222.9

Subsequent Events (Details)

Subsequent Events (Details) $ in Millions	1 Months Ended
Subsequent Events (Details) $ in Millions	Oct. 31, 2024 USD ($)
Subsequent Event \| WorkForce Software
Subsequent Event [Line Items]
Cash consideration to acquire business	$ 1,200