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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) Parenthetical - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0
Pension Plan and Restoration of Retirement Income Plan: |  |  |  |
Amortization of deferred net loss | 0.2 | 0.3 | 0.6 | 0.9
Postretirement Benefit Plans: |  |  |  |
Amortization of prior service cost | (0.1) | (0.2) | (0.3) | (0.5)
Other Comprehensive Income Reclassification Of Defined Benefit Postretirement Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Tax | 0.0 | 0.0 | 0.0 | 0.0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Noncontrolling Interest | 0.0 | 0.1 | 0.1 | (0.3)
Pension Plan [Member] |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Adjustment for Settlement or Curtailment Gain (Loss), Tax | $ 0.3 | $ 0.5 | $ 1.9 | $ 0.6

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