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Retirement Benefits Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jul. 31, 2021 | Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Accrued postretirement benefits | $ 269.4 |  | $ 269.4 |  |  | $ 326.7
Income tax provision | 22.0 | $ 0.8 | 31.5 | $ 104.2 |  |
Settlement gain | (64.9) | 0.0 | (64.9) | 0.0 |  |
Collective-Bargaining Arrangement, Other |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Income tax provision | 15.5 |  |  |  |  |
Pension Plans Defined Benefit |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year |  |  |  |  |  | $ 87.0
Defined Benefit Plan, Plan Assets, Contributions by Employer | 50.0 |  | 67.5 |  |  |
Settlement gain | 0.0 | 0.0 | 0.0 | 0.0 |  |
Other Postretirement Benefit Plan, Defined Benefit |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Settlement gain | $ (64.9) | $ 0.0 | $ (64.9) | $ 0.0 |  |
Other Postretirement Benefit Plan, Defined Benefit | Collective-Bargaining Arrangement, Other |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Accrued postretirement benefits |  |  |  |  | $ 43.0 |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax |  |  |  |  | $ 21.9 |

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