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Derivative Instruments and Hedging Activities - Gains and Losses (Details) - Not designated as hedging instruments - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Derivative instruments and hedging activities    
Impact on net income of unrealized gains and losses resulting from changes in fair value of derivative instruments $ 2.1 $ (4.9)
Foreign exchange contracts    
Derivative instruments and hedging activities    
Impact on net income of unrealized gains and losses resulting from changes in fair value of derivative instruments 1.7 (4.4)
Embedded derivatives in purchase and delivery contracts    
Derivative instruments and hedging activities    
Impact on net income of unrealized gains and losses resulting from changes in fair value of derivative instruments (0.1) 0.1
Fixed price commodity contracts    
Derivative instruments and hedging activities    
Impact on net income of unrealized gains and losses resulting from changes in fair value of derivative instruments $ 0.5 $ (0.6)