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Derivative Instruments and Hedging Activities - Fair Values (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Foreign exchange contracts | Other current assets    
Derivative instruments and hedging activities    
Derivative assets $ 0.3 $ 0.2
Foreign exchange contracts | Other current liabilities    
Derivative instruments and hedging activities    
Derivative liabilities 1.5 2.8
Embedded derivative in purchase and delivery contracts | Other current assets    
Derivative instruments and hedging activities    
Derivative assets 0.2 0.2
Embedded derivative in purchase and delivery contracts | Other long-term assets    
Derivative instruments and hedging activities    
Derivative assets 0.1 0.2
Embedded derivative in purchase and delivery contracts | Other current liabilities    
Derivative instruments and hedging activities    
Derivative liabilities 0.8 0.9
Fixed price commodity contracts | Other current liabilities    
Derivative instruments and hedging activities    
Derivative liabilities $ 0.2 $ 0.5