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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ (66.2) $ 48.6 [1],[2] $ (252.4) [1]
Other comprehensive income (loss) before income tax effect:      
Net income (loss) on foreign currency cash flow hedges reclassified as income (0.2) (0.2) 4.3
Defined benefit plans and other postretirement benefits:      
Net gain (loss) arising during the period (6.8) (7.2) (9.5)
Prior service benefit (cost) arising during the period (0.6) 27.4 0.0
Amortization of prior service benefit (cost) during the period (7.1) (4.9) (2.7)
Amortization of net gain (loss) during the period 9.2 8.6 8.2
Other comprehensive income (loss) before income tax effect (5.5) 23.7 0.3
Income tax effect (1.5) (1.5) (1.5)
Other comprehensive income (loss) (7.0) 22.2 (1.2)
Total comprehensive income (loss) $ (73.2) $ 70.8 $ (253.6)
[1] As adjusted due to the adoption of ASU 2016-18 "Statement of Cash Flows (Topic 230) Restricted Cash."
[2] As adjusted due to the adoption of ASU 2017-07 Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost