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Financial Instruments, Risk Management and Fair Value Measurements - Fair Value (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets    
Other $ 28.9 $ 25.3
Total assets 28.9 25.3
Liabilities    
Other 37.1 30.5
Total liabilities 37.1 30.5
Quoted Prices in Active Markets for Identical Assets (Level 1) | Energy contracts    
Assets    
Derivatives 0.0 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign exchange contracts    
Assets    
Derivatives 0.0 0.0
Liabilities    
Derivative Liabilities 0.0 0.0
Significant Other Observable Inputs (Level 2)    
Assets    
Other 0.0 0.0
Total assets 2.0 6.4
Liabilities    
Other 1.3 0.6
Total liabilities 1.9 9.5
Significant Other Observable Inputs (Level 2) | Energy contracts    
Assets    
Derivatives 0.2 2.0
Significant Other Observable Inputs (Level 2) | Foreign exchange contracts    
Assets    
Derivatives 1.8 4.4
Liabilities    
Derivative Liabilities 0.6 8.9
Significant Unobservable Inputs (Level 3)    
Assets    
Other 0.0 0.0
Total assets 0.0 0.0
Liabilities    
Other 0.0 0.0
Total liabilities 0.0 0.0
Significant Unobservable Inputs (Level 3) | Energy contracts    
Assets    
Derivatives 0.0 0.0
Significant Unobservable Inputs (Level 3) | Foreign exchange contracts    
Assets    
Derivatives 0.0 0.0
Liabilities    
Derivative Liabilities 0.0 0.0
Estimate of Fair Value Measurement    
Assets    
Other 28.9 25.3
Total assets 30.9 31.7
Liabilities    
Other 38.4 31.1
Total liabilities 39.0 40.0
Estimate of Fair Value Measurement | Energy contracts    
Assets    
Derivatives 0.2 2.0
Estimate of Fair Value Measurement | Foreign exchange contracts    
Assets    
Derivatives 1.8 4.4
Liabilities    
Derivative Liabilities $ 0.6 $ 8.9