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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) Parenthetical - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Pension Plan and Restoration of Retirement Income Plan: |  |
Other Comprehensive Income Amortization Of Defined Benefit Pension Plans Net Prior Service Cost Recognized in Net Periodic Pension Cost, Tax | $ 0.0 | $ 0.0
Amortization of deferred net loss | 0.1 | 0.2
Other Comprehensive Income (Loss), Defined Benefit Plan, Adjustment for Settlement or Curtailment Gain (Loss), Tax | 2.2 | 1.0
Postretirement Benefit Plans: |  |
Amortization of prior service cost | 0.0 | (0.1)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Noncontrolling Interest | $ 0.0 | $ 0.0

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