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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) Parenthetical - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Pension Plan and Restoration of Retirement Income Plan: |  |  |  |
Amortization of deferred net loss | $ 0.3 | $ 0.3 | $ 0.5 | $ 0.5
Postretirement Benefit Plans: |  |  |  |
Amortization of prior service cost | (0.1) | (0.2) | (0.2) | (0.3)
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
Pension Plan [Member] |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Adjustment for Settlement or Curtailment Gain (Loss), Tax | $ 0.1 | $ 0.0 | $ 2.3 | $ 0.0

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