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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement of Comprehensive Income [Abstract]      
Amortization of prior service cost and net loss included in net periodic pension cost, tax $ 0.4 $ 1.0 $ 2.0
Net gain (loss) incurred in period, tax $ 2.7 $ (2.0) $ (1.0)