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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 | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Tax impact | $ 24.9 | $ 3.6 | $ 52.3 | $ 19.3 |
Amounts reclassified from accumulated other comprehensive income |  |  | 10.1 |  |
Deferred tax assets, other comprehensive loss | 150.6 |  | 150.6 |  | $ 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 | 4.5 | 12.5 | 9.1 |
Tax impact | 1.1 | 0.9 | 2.4 | 2.0 |
Amounts reclassified from accumulated other comprehensive income | 5.0 | 3.6 | 10.1 | 7.1 |
Pension Plan |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Amortization of prior service cost | (0.1) | (0.1) | (0.1) | (0.1) |
Defined Benefit Plan, Amortization of Gain (Loss) | 6.5 | 4.9 | 13.1 | 9.7 |
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) | (0.5) | (0.5) |
Defined Benefit Plan, Amortization of Gain (Loss) | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |

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