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Accumulated Other Comprehensive Loss
12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss at the balance sheet dates is comprised of the following:
(In millions)Pension Plan AdjustmentsOther Post Retirement Employee Benefit Plan AdjustmentsTotal
Balance at December 31, 2018
$(83.0)$15.7 $(67.3)
Other comprehensive income (loss) before reclassifications9.8 (7.1)2.7 
Amounts reclassified from accumulated other comprehensive loss5.4 (0.3)5.1 
   Other comprehensive income (loss), net of tax15.2 (7.4)7.8 
Balance at December 31, 2019
(67.8)8.3 (59.5)
Other comprehensive income (loss) before reclassifications6.0 (8.1)(2.1)
Amounts reclassified from accumulated other comprehensive loss7.3 — 7.3 
   Other comprehensive income (loss), net of tax13.3 (8.1)5.2 
Balance at December 31, 2020
$(54.5)$0.2 $(54.3)