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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) Parenthetical - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Pension Plan and Restoration of Retirement Income Plan: |  |
Amortization of deferred net loss | $ 0.2 | $ 0.3
Postretirement Benefit Plans: |  |
Amortization of prior service cost | (0.1) | (0.2)
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Noncontrolling Interest | 0.0 | (0.4)
Pension Plan [Member] |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Adjustment for Settlement or Curtailment Gain (Loss), Tax | $ 1.0 | $ 0.0

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