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Stockholders' Equity - Reclassification out of accumulated other comprehensive income (loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Schedule of Reclassifications out of Accumulated Comprehensive Income (Loss) [Line Items]    
Cost of sales $ (317.7) $ (253.9)
Income (loss) before taxes (6.1) (34.5)
Tax expense (3.9) (1.5)
Other income (expense) - net 2.7 (2.1)
Reclassification out of Accumulated Other Comprehensive Income    
Schedule of Reclassifications out of Accumulated Comprehensive Income (Loss) [Line Items]    
Net of Tax (0.6) (0.8)
Gains and Losses on Cash Flow Hedges    
Schedule of Reclassifications out of Accumulated Comprehensive Income (Loss) [Line Items]    
Net of Tax   (0.2)
Gains and Losses on Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income    
Schedule of Reclassifications out of Accumulated Comprehensive Income (Loss) [Line Items]    
Income (loss) before taxes   (0.2)
Net loss   (0.2)
Gains and Losses on Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income | Foreign Currency Exchange Contracts    
Schedule of Reclassifications out of Accumulated Comprehensive Income (Loss) [Line Items]    
Cost of sales   (0.2)
Pension & Postretirement    
Schedule of Reclassifications out of Accumulated Comprehensive Income (Loss) [Line Items]    
Net of Tax (0.6) (0.6)
Pension & Postretirement | Reclassification out of Accumulated Other Comprehensive Income    
Schedule of Reclassifications out of Accumulated Comprehensive Income (Loss) [Line Items]    
Total before tax (0.7) (1.0)
Tax expense 0.1 0.4
Net of Tax (0.6) (0.6)
Actuarial Losses | Reclassification out of Accumulated Other Comprehensive Income    
Schedule of Reclassifications out of Accumulated Comprehensive Income (Loss) [Line Items]    
Other income (expense) - net (1.4) (1.3)
Prior Service Cost | Reclassification out of Accumulated Other Comprehensive Income    
Schedule of Reclassifications out of Accumulated Comprehensive Income (Loss) [Line Items]    
Other income (expense) - net $ 0.7 $ 0.3