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Derivative Instruments and Hedging Activities - Fair Values (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Foreign exchange contracts | Other current assets    
Derivative instruments and hedging activities    
Derivative assets $ 5.7  
Foreign exchange contracts | Other current liabilities    
Derivative instruments and hedging activities    
Derivative liabilities 0.1 $ 1.4
Embedded derivatives in purchase and delivery contracts | Other current assets    
Derivative instruments and hedging activities    
Derivative assets 0.8 2.7
Embedded derivatives in purchase and delivery contracts | Other long-term assets    
Derivative instruments and hedging activities    
Derivative assets   1.3
Embedded derivatives in purchase and delivery contracts | Other current liabilities    
Derivative instruments and hedging activities    
Derivative liabilities 0.5 0.3
Embedded derivatives in purchase and delivery contracts | Other long-term liabilities    
Derivative instruments and hedging activities    
Derivative liabilities 0.3  
Fixed price commodity contracts | Other current assets    
Derivative instruments and hedging activities    
Derivative assets $ 0.4 $ 0.2