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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ 160.3 $ (19.7) $ 111.3
Other comprehensive income (loss):      
Foreign currency translation adjustments 17.7 15.8 (56.8)
Reclassification of foreign currency items to other income, net 0.0 0.0 (41.6)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax [Abstract]      
Unrealized gains on hedging instruments 2.1 0.0 0.0
Income tax provision related to hedging instruments (0.8) 0.0 0.0
Pension and postretirement benefit liability adjustments:      
Amortization of net losses and settlement losses included in net periodic pension cost 2.3 1.4 0.5
Pension and postretirement benefit liability adjustments arising during the period 0.0 0.1 (8.1)
Income tax benefit (provision) related to pension and postretirement plans (1.2) (0.6) 2.9
Total other comprehensive income (loss) 20.1 16.7 (103.1)
Total comprehensive income (loss) $ 180.4 $ (3.0) $ 8.2