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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Comprehensive income (loss):        
Net income (loss) $ 44.3 $ (52.4) $ 99.4 $ (227.5)
Other comprehensive income (loss) before income tax effect:        
Net income (loss) on foreign currency cash flow hedges reclassified as income 0.0 0.0 (0.1) (0.1)
Defined benefit plans and other postretirement benefits:        
OPEB curtailment gain, net (8.0) 0.0 (8.0) 0.0
Amortization of prior service benefit during the period (0.3) (0.8) (1.2) (2.4)
Amortization of net loss during the period 1.1 2.1 3.6 6.3
Other comprehensive income (loss) before income tax effect (7.2) 1.3 (5.7) 3.8
Income tax effect (0.1) (0.1) (0.2) (0.2)
Other comprehensive income (loss) (7.3) 1.2 (5.9) 3.6
Total comprehensive income (loss) $ 37.0 $ (51.2) $ 93.5 $ (223.9)