Derivative Instruments Derivative Instruments Affecting the Consolidated Statements of Income (Details) (Not Designated as Hedging Instrument [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in Income on Derivative	$ (27.9)	$ (0.7)	$ 0
Foreign Currency Forward Contracts [Member] | Foreign Exchange Gain (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in Income on Derivative	$ (27.9)	$ (0.7)	$ 0