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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Net reclassification adjustments for amounts recognized in net income as a component of net periodic benefit cost, tax expense $ 0.0 $ 0.0
Net changes in pension and other postretirement plan assets and benefit obligations recognized in other comprehensive income, tax expense $ (0.1) $ 0.7