Derivative Instruments - Schedule of Gains and Losses Recognized on the Balance Sheet for Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in Accumulated Other Comprehensive Income (Loss)	$ 29.2	$ (32.0)	$ (4.2)	$ (32.0)
Recognized in Earnings	5.6	0.0	3.4	0.0
Cross-currency swap agreements | Derivatives designated as hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in Accumulated Other Comprehensive Income (Loss)	26.8	(31.9)	(6.0)	(31.9)
Recognized in Earnings	0.0	0.0	0.0	0.0
Interest rate swaps | Derivatives designated as hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in Accumulated Other Comprehensive Income (Loss)	1.4	(0.7)	2.5	(0.7)
Recognized in Earnings	0.0	0.0	0.0	0.0
Interest rate swaps | Derivatives not designated as hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in Accumulated Other Comprehensive Income (Loss)	0.0	0.0	0.0	0.0
Recognized in Earnings	0.4	0.0	0.6	0.0
Foreign currency option and forward contracts | Derivatives not designated as hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in Accumulated Other Comprehensive Income (Loss)	0.0	0.0	0.0	0.0
Recognized in Earnings	5.2	0.0	2.8	0.0
Foreign currency denominated notes | Derivatives designated as hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in Accumulated Other Comprehensive Income (Loss)	1.0	0.6	(0.7)	0.6
Recognized in Earnings	$ 0.0	$ 0.0	$ 0.0	$ 0.0