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Financial Instruments, Risk Management and Fair Value Measurements - Derivatives Gain (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Reclassification of deferred hedging (gains) losses, net of tax    
Total derivative instruments, net of tax of ($0.8) and ($2.3) for the three months ended March 31, 2018 and 2017, respectively $ 1.9 $ 0.6
Designated as Cash Flow Hedges    
Reclassification of deferred hedging (gains) losses, net of tax    
Total derivative instruments, net of tax of ($0.8) and ($2.3) for the three months ended March 31, 2018 and 2017, respectively 1.9 0.6
Designated as Cash Flow Hedges | Foreign exchange contracts    
Reclassification of deferred hedging (gains) losses, net of tax    
Total derivative instruments, net of tax of ($0.8) and ($2.3) for the three months ended March 31, 2018 and 2017, respectively 1.7 2.0
Designated as Cash Flow Hedges | Energy contracts    
Reclassification of deferred hedging (gains) losses, net of tax    
Total derivative instruments, net of tax of ($0.8) and ($2.3) for the three months ended March 31, 2018 and 2017, respectively 0.0 (1.4)
Designated as Cash Flow Hedges | Other contracts    
Reclassification of deferred hedging (gains) losses, net of tax    
Total derivative instruments, net of tax of ($0.8) and ($2.3) for the three months ended March 31, 2018 and 2017, respectively 0.2 0.0
Designated as Cash Flow Hedges | Cash Flow Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Unrealized hedging gains (losses) and other, net of tax 1.5 1.1
Reclassification of deferred hedging (gains) losses, net of tax    
Effective portion 0.5 (0.5)
Ineffective portion (0.1) 0.0
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 1.5 1.9
Reclassification of deferred hedging (gains) losses, net of tax    
Effective portion 0.3 0.1
Ineffective portion (0.1) 0.0
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 0.0 (0.8)
Reclassification of deferred hedging (gains) losses, net of tax    
Effective portion 0.0 (0.6)
Ineffective portion 0.0 0.0
Designated as Cash Flow Hedges | Cash Flow Hedging | Other contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Unrealized hedging gains (losses) and other, net of tax 0.0 0.0
Reclassification of deferred hedging (gains) losses, net of tax    
Effective portion 0.2 0.0
Ineffective portion 0.0 0.0
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 (1.4) (6.0)
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 $ (1.4) $ (6.0)