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Changes in Equity and Accumulated Other Comprehensive Loss (Details of Accumulated Other Comprehensive Income Components) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Tax impact | $ 19.6 | $ 17.1 | $ 71.9 | $ 36.6 |
Amounts reclassified from accumulated other comprehensive income |  |  | 15.3 |  |
Deferred tax assets, other comprehensive loss | 151.5 |  | 151.5 |  | $ 148.2
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 6.1 | 4.4 | 18.6 | 13.5 |
Tax impact | 0.9 | 1.1 | 3.3 | 3.1 |
Amounts reclassified from accumulated other comprehensive income | 5.2 | 3.3 | 15.3 | 10.4 |
Pension Plan |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Amortization of prior service cost | (0.1) | (0.1) | (0.2) | (0.2) |
Defined Benefit Plan, Amortization of Gain (Loss) | 6.5 | 4.8 | 19.6 | 14.5 |
Other Postretirement Benefits Plan |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Amortization of prior service cost | (0.3) | (0.3) | (0.8) | (0.8) |
Defined Benefit Plan, Amortization of Gain (Loss) | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |

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