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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ (80.8) $ (66.2) $ 48.6
Other comprehensive income (loss) before income tax effect:      
Net income (loss) on foreign currency cash flow hedges reclassified as income (0.2) (0.2) (0.2)
Defined benefit plans and other postretirement benefits:      
Net gain (loss) arising during the period (12.7) (6.8) (7.2)
Prior service benefit (cost) arising during the period 0.0 (0.6) 27.4
Amortization of prior service benefit (cost) during the period (4.8) (7.1) (4.9)
Amortization of net gain (loss) during the period 8.9 9.2 8.6
Other comprehensive income (loss) before income tax effect (8.8) (5.5) 23.7
Income tax effect (1.0) (1.5) (1.5)
Other comprehensive income (loss) (9.8) (7.0) 22.2
Total comprehensive income (loss) $ (90.6) $ (73.2) $ 70.8