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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Comprehensive income (loss):        
Net income (loss) $ (35.1) $ (26.9) $ (175.1) $ (29.6)
Other comprehensive income before income tax effect:        
Net income (loss) on foreign currency cash flow hedges reclassified as income (0.1) (0.0) (0.1) 0.0
Defined benefit plans and other postretirement benefits:        
Amortization of prior service benefit (cost) during the period (0.8) (0.8) (1.6) (1.6)
Amortization of net gain (loss) during the period 2.1 1.8 4.2 4.3
Other comprehensive income (loss) before income tax effect 1.2 1.0 2.5 2.7
Income tax effect (0.1) (0.3) (0.1) (0.6)
Other comprehensive income (loss) 1.1 0.7 2.4 2.1
Total comprehensive income (loss) $ (34.0) $ (26.2) $ (172.7) $ (27.5)