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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
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |
Tax impact | $ 28.7 | $ 17.5
Amounts reclassified from accumulated other comprehensive income | 4.9 |
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 | 6.2 | 4.4
Tax impact | 1.3 | 1.0
Amounts reclassified from accumulated other comprehensive income | 4.9 | 3.4
Pension Plan |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |
Amortization of prior service cost | 0.0 | (0.1)
Defined Benefit Plan, Amortization of Gain (Loss) | 6.5 | 4.8
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)
Defined Benefit Plan, Amortization of Gain (Loss) | $ 0.0 | $ 0.0

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