Derivative Instruments (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss)
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ 7.8	$ 8.2	$ 7.8
Derivatives designated as hedging instruments | Interest-rate swap
Derivative Instruments, Gain (Loss)
Derivative Instruments, Gain (Loss) Recognized in Income, Net	8.2	8.1	7.0
Not Designated as Hedging Instrument [Member] | Forward exchange contracts
Derivative Instruments, Gain (Loss)
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ (0.4)	$ 0.1	$ 0.8