Derivative Instruments Derivative Instruments Affecting the Consolidated Statements of Income (Details) (Not Designated as Hedging Instrument [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in Income on Derivative	$ (10.1)	$ (1.3)	$ (1.4)	$ (6.3)
Foreign Currency Forward Contracts [Member] | Foreign Exchange Loss [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in Income on Derivative	$ (10.1)	$ (1.3)	$ (1.4)	$ (6.3)