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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statement of Comprehensive Income [Abstract]      
Net loss $ (14.1) $ (167.1) $ (123.3)
Other comprehensive (loss) income before income tax effect:      
Net loss on foreign currency cash flow hedges reclassified as income (0.2) (0.1) (0.2)
Defined benefit plans and other postretirement benefits:      
Net (loss) gain arising during the period (5.9) 31.6 (13.4)
OPEB curtailment gain (8.9) 0.0 0.0
Amortization of prior service benefit during the period (1.2) (3.1) (3.0)
Amortization of net loss during the period 4.8 8.4 8.7
Other comprehensive (loss) income before income tax effect (11.4) 36.8 (7.9)
Income tax effect (0.3) (0.3) (1.0)
Other comprehensive (loss) income (11.7) 36.5 (8.9)
Total comprehensive loss $ (25.8) $ (130.6) $ (132.2)