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Financial Instruments, Risk Management and Fair Value Measurements - Derivatives Gain (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized hedging gains (losses) and other, net of tax $ (2.6) $ (1.6) $ (1.5) $ 0.7
Reclassification of deferred hedging (gains) losses, net of tax        
Effective portion 0.3 1.7 (0.2) 4.1
Total derivative instruments, net of tax of ($0.6) and ($2.9) for the three and six months ended June 30, 2017 and $0.9 and $0.4 for the three and six months ended June 30, 2016, respectively (2.3) 0.1 (1.7) 4.8
Foreign exchange contracts        
Reclassification of deferred hedging (gains) losses, net of tax        
Total derivative instruments, net of tax of ($0.6) and ($2.9) for the three and six months ended June 30, 2017 and $0.9 and $0.4 for the three and six months ended June 30, 2016, respectively (2.3) (1.2) (0.3) 3.7
Energy contracts        
Reclassification of deferred hedging (gains) losses, net of tax        
Total derivative instruments, net of tax of ($0.6) and ($2.9) for the three and six months ended June 30, 2017 and $0.9 and $0.4 for the three and six months ended June 30, 2016, respectively 0.0 1.3 (1.4) 1.1
Designated as Cash Flow Hedges | Cash Flow Hedging | Foreign exchange contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized hedging gains (losses) and other, net of tax (2.5) (2.2) (0.6) 0.7
Reclassification of deferred hedging (gains) losses, net of tax        
Effective portion 0.2 1.0 0.3 3.0
Designated as Cash Flow Hedges | Cash Flow Hedging | Energy contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized hedging gains (losses) and other, net of tax (0.1) 0.6 (0.9) 0.0
Reclassification of deferred hedging (gains) losses, net of tax        
Effective portion 0.1 0.7 (0.5) 1.1
Not Designated as Hedging Instruments        
Reclassification of deferred hedging (gains) losses, net of tax        
Amount of pre-tax gain or (loss) recognized in income on derivatives (4.2) 11.7 (10.5) 28.3
Not Designated as Hedging Instruments | Foreign exchange contracts | Cost of sales and services        
Reclassification of deferred hedging (gains) losses, net of tax        
Amount of pre-tax gain or (loss) recognized in income on derivatives $ (4.2) $ 11.7 $ (10.5) $ 28.3