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Financial Instruments, Risk Management and Fair Value Measurements - Derivatives Gain (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Reclassification of deferred hedging (gains) losses, net of tax        
Total derivative instruments, net of tax of ($0.8) and ($1.0) for the three and nine months ended September 30, 2018 and $1.2 and ($1.7) for the three and nine months ended September 30, 2017, respectively $ (6.6) $ (0.2) $ 1.1 $ (1.9)
Designated as Cash Flow Hedges | Cash Flow Hedging        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized hedging gains (losses) and other, net of tax 2.6 (1.7) 12.0 (3.2)
Reclassification of deferred hedging (gains) losses, net of tax        
Effective portion (9.2) 1.5 (10.8) 1.3
Ineffective Portion     (0.1) 0.0
Total derivative instruments, net of tax of ($0.8) and ($1.0) for the three and nine months ended September 30, 2018 and $1.2 and ($1.7) for the three and nine months ended September 30, 2017, respectively (6.6) (0.2) 1.1 (1.9)
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 2.3 (1.8) 11.7 (2.4)
Reclassification of deferred hedging (gains) losses, net of tax        
Effective portion (9.4) 1.5 (11.1) 1.8
Ineffective Portion     (0.1) 0.0
Total derivative instruments, net of tax of ($0.8) and ($1.0) for the three and nine months ended September 30, 2018 and $1.2 and ($1.7) for the three and nine months ended September 30, 2017, respectively (7.1) (0.3) 0.5 (0.6)
Designated as Cash Flow Hedges | Cash Flow Hedging | Energy        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized hedging gains (losses) and other, net of tax 0.0 0.1 0.0 (0.8)
Reclassification of deferred hedging (gains) losses, net of tax        
Effective portion 0.0 0.1 0.0 (0.4)
Ineffective Portion     0.0 0.0
Total derivative instruments, net of tax of ($0.8) and ($1.0) for the three and nine months ended September 30, 2018 and $1.2 and ($1.7) for the three and nine months ended September 30, 2017, respectively 0.0 0.2 0.0 (1.2)
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 0.3 0.0 0.3 0.0
Reclassification of deferred hedging (gains) losses, net of tax        
Effective portion 0.2 (0.1) 0.3 (0.1)
Ineffective Portion     0.0 0.0
Total derivative instruments, net of tax of ($0.8) and ($1.0) for the three and nine months ended September 30, 2018 and $1.2 and ($1.7) for the three and nine months ended September 30, 2017, respectively 0.5 (0.1) 0.6 (0.1)
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 (1.5) 1.1 (10.3) (9.4)
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 $ (1.5) $ 1.1 $ (10.3) $ (9.4)