Pensions and Postretirement Benefits Other Than Pensions (Schedule of Fair Values of Company's Pension Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 |
Defined benefit plan, fair value of pension plan assets | $ 2,993.8 | $ 3,114.6 |
Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 1.6 | 3.1 |
Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 2,118.7 | 2,011.8 |
Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 140.2 | 143.4 |
Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 739.1 | 958.7 |
Registered mutual funds, fixed income specialty [Member] | | |
Defined benefit plan, fair value of pension plan assets | 191.4 | 118.3 |
Registered mutual funds, fixed income specialty [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Registered mutual funds, fixed income specialty [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Registered mutual funds, fixed income specialty [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
U.S. Government and Agency Obligations [Member] | | |
Defined benefit plan, fair value of pension plan assets | 551.4 | 504.7 |
U.S. Government and Agency Obligations [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
U.S. Government and Agency Obligations [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 551.4 | 504.7 |
U.S. Government and Agency Obligations [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Corporate and Non-U.S. Bonds [Member] | | |
Defined benefit plan, fair value of pension plan assets | 1,453.6 | 1,424.2 |
Corporate and Non-U.S. Bonds [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Corporate and Non-U.S. Bonds [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 1,453.6 | 1,424.2 |
Corporate and Non-U.S. Bonds [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Asset-Backed And Mortgage-Backed Securities [Member] | | |
Defined benefit plan, fair value of pension plan assets | 63.7 | 48.4 |
Asset-Backed And Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Asset-Backed And Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 63.7 | 48.4 |
Asset-Backed And Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Commingled Funds - Fixed Income Specialty [Member] | | |
Defined benefit plan, fair value of pension plan assets | 77.7 | 153.3 |
Commingled Funds - Fixed Income Specialty [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Commingled Funds - Fixed Income Specialty [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Commingled Funds - Fixed Income Specialty [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Other Fixed Income [Member] | | |
Defined benefit plan, fair value of pension plan assets | 32 | 28.3 |
Other Fixed Income [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Other Fixed Income [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Other Fixed Income [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 32 | 28.3 |
Derivative [Member] | | |
Defined benefit plan, fair value of pension plan assets | (0.5) | 0.3 |
Derivative [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Derivative [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | (0.5) | 0.3 |
Derivative [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Derivative [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Real Estate Funds [Member] | | |
Defined benefit plan, fair value of pension plan assets | 2.1 | 2.8 |
Real Estate Funds [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Real Estate Funds [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Real Estate Funds [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 2.1 | 2.8 |
Real Estate Funds [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Other Defined Benefit [Member] | | |
Defined benefit plan, fair value of pension plan assets | 106.1 | 112.3 |
Other Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Other Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Other Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 106.1 | 112.3 |
Other Defined Benefit [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Cash and Cash Equivalents [Member] | | |
Defined benefit plan, fair value of pension plan assets | 52.1 | 37.3 |
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 1.6 | 3.1 |
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 50.5 | 34.2 |
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Registered mutual funds, equity specialty [Member] | | |
Defined benefit plan, fair value of pension plan assets | 107.5 | 65.1 |
Registered mutual funds, equity specialty [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Registered mutual funds, equity specialty [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Registered mutual funds, equity specialty [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Commingled funds, equity specialty [Member] | | |
Defined benefit plan, fair value of pension plan assets | 362.5 | 622 |
Commingled funds, equity specialty [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Commingled funds, equity specialty [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Commingled funds, equity specialty [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Receivables and Payables | | |
Defined benefit plan, fair value of pension plan assets | (5.8) | (2.4) |
Cash and Cash Equivalents [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Registered mutual funds, equity specialty [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 107.5 | 65.1 |
Equity Securities [Member] | | |
Defined benefit plan, fair value of pension plan assets | 470 | 687.1 |
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Equity Securities [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 470 | 687.1 |
Commingled funds, equity specialty [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 362.5 | 622 |
Fixed Income Investments [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Fixed Income Investments [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 2,068.7 | 1,977.3 |
Fixed Income Investments [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 32 | 28.3 |
Fixed Income Investments [Member] | Registered mutual funds, fixed income specialty [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 191.4 | 118.3 |
Fixed Income Investments [Member] | U.S. Government and Agency Obligations [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Fixed Income Investments [Member] | Corporate and Non-U.S. Bonds [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Fixed Income Investments [Member] | Asset-Backed And Mortgage-Backed Securities [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Fixed Income Investments [Member] | Commingled Funds - Fixed Income Specialty [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 77.7 | 153.3 |
Fixed Income Investments [Member] | Other Fixed Income [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Fixed Income Investments [Member] | Total Plan Assets Excluding Nav Assets Member | | |
Defined benefit plan, fair value of pension plan assets | 2,369.8 | 2,277.2 |
Fixed Income Investments [Member] | Total Plan Assets Excluding Nav Assets Member | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 269.1 | 271.6 |
Defined Benefit Plan Fair Value of Plan Assets Measured Using Net Asset Value [Member] | | |
Defined benefit plan, fair value of pension plan assets | $ 2,999.6 | $ 3,117 |