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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (PARENTHETICAL) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Amortization of net actuarial loss and prior service cost, taxes $ 0.8 $ 0.4 $ 0.6
Adjustments of net actuarial losses and prior service cost, taxes $ 3.8 $ 2.9 $ 1.1