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Derivative Instruments and Hedging Activities - Fair Values (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Foreign exchange contracts | Other current liabilities.    
Derivative instruments and hedging activities    
Derivative liabilities $ 1.3 $ 5.1
Embedded derivatives in purchase and delivery contracts | Other current assets    
Derivative instruments and hedging activities    
Derivative assets 0.5 0.6
Embedded derivatives in purchase and delivery contracts | Other current liabilities.    
Derivative instruments and hedging activities    
Derivative liabilities 0.5 0.4
Fixed price commodity contracts | Other current liabilities.    
Derivative instruments and hedging activities    
Derivative liabilities $ 0.4 $ 0.2