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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Income Tax Expense (Benefit) | $ 4.1 | $ 27.5 | $ 21.6 | $ 49.4
Amounts reclassified from accumulated other comprehensive income |  |  | 7.1 |
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 | 4.5 | 3.0 | 9.1 | 6.2
Income Tax Expense (Benefit) | 0.9 | 0.6 | 2.0 | 1.4
Amounts reclassified from accumulated other comprehensive income | 3.6 | 2.4 | 7.1 | 4.8
Pension Plan |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Amortization of prior service cost | (0.1) | (0.2) | (0.1) | (0.3)
Defined Benefit Plan, Amortization of Gain (Loss) | 4.9 | 3.3 | 9.7 | 6.7
Other Postretirement Benefits Plan |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Amortization of prior service cost | 0.0 |  | 0.0 | 0.0
Defined Benefit Plan, Amortization of Gain (Loss) | $ (0.3) | $ (0.1) | $ (0.5) | $ (0.2)

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