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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ (167.1) $ (123.3) $ (80.8)
Other comprehensive income (loss) before income tax effect:      
Net income (loss) on foreign currency cash flow hedges reclassified as income (0.1) (0.2) (0.2)
Defined benefit plans and other postretirement benefits:      
Net gain (loss) arising during the period 31.6 (13.4) (12.7)
Amortization of prior service benefit (cost) during the period (3.1) (3.0) (4.8)
Amortization of net gain (loss) during the period 8.4 8.7 8.9
Other comprehensive income (loss) before income tax effect 36.8 (7.9) (8.8)
Income tax effect (0.3) (1.0) (1.0)
Other comprehensive income (loss) 36.5 (8.9) (9.8)
Total comprehensive income (loss) $ (130.6) $ (132.2) $ (90.6)