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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 $ 34.5 $ 82.8 $ 89.7
Other comprehensive income (loss), net of tax:      
Foreign currency translation adjustments 36.0 (16.7) (54.4)
Unrealized gains (losses) on derivative instruments 2.0 13.2 (24.9)
Less: Reclassification adjustment for losses on derivative instruments included in net income 0.3 6.5 11.6
Net gain (loss) from postretirement benefit plans 8.3 (4.3) (0.8)
Less: Amortization of postretirement benefit plans' costs included in net periodic benefit cost 3.3 3.4 3.6
Other comprehensive income (loss) 49.9 2.1 (64.9)
Comprehensive income $ 84.4 $ 84.9 $ 24.8