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Derivative Instruments and Hedging Activities - Fair Values (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Foreign exchange contracts | Other current assets    
Derivative instruments and hedging activities    
Derivative assets $ 0.4 $ 4.5
Foreign exchange contracts | Other current liabilities    
Derivative instruments and hedging activities    
Derivative liabilities 2.7 0.1
Embedded derivatives in purchase and delivery contracts | Other current assets    
Derivative instruments and hedging activities    
Derivative assets 0.5 0.9
Embedded derivatives in purchase and delivery contracts | Other long-term assets    
Derivative instruments and hedging activities    
Derivative assets 0.1  
Embedded derivatives in purchase and delivery contracts | Other current liabilities    
Derivative instruments and hedging activities    
Derivative liabilities 0.6 1.5
Embedded derivatives in purchase and delivery contracts | Other long-term liabilities    
Derivative instruments and hedging activities    
Derivative liabilities 0.7 1.4
Fixed price commodity contracts | Other current assets    
Derivative instruments and hedging activities    
Derivative assets   $ 0.8
Fixed price commodity contracts | Other current liabilities    
Derivative instruments and hedging activities    
Derivative liabilities $ 0.4