Derivative Instruments and Hedging Activities (Details 3) (Not designated as hedging instruments, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Derivative instruments and hedging activities
Impact on net income of unrealized gains and losses resulting from changes in fair value of derivative instruments	$ (2.4)	$ (0.8)
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	(2.7)	(0.6)
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	0.3
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		$ (0.2)