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Derivative Instruments and Hedging Activities - Fair Values (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Foreign exchange contracts | Other current liabilities    
Derivative instruments and hedging activities    
Derivative liabilities $ 1.4 $ 1.3
Embedded derivatives in purchase and delivery contracts | Other current assets    
Derivative instruments and hedging activities    
Derivative assets 2.7 0.5
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 0.3 0.5
Fixed price commodity contracts | Other current assets    
Derivative instruments and hedging activities    
Derivative assets $ 0.2  
Fixed price commodity contracts | Other current liabilities    
Derivative instruments and hedging activities    
Derivative liabilities   $ 0.4