Shareholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Comprehensive (Loss) Income [Roll Forward]
Balance as of beginning of period			$ 1,940.0	$ 1,905.9
Other comprehensive income (loss)	$ 3.5	$ (22.4)	31.6	(30.7)
Balance as of end of period	1,935.8	1,976.8	1,935.8	1,976.8
Foreign Currency Translation Adjustments
Other Comprehensive (Loss) Income [Roll Forward]
Balance as of beginning of period			(147.5)	(108.7)
Other comprehensive income (loss)			29.8	(27.9)
Less: Net other comprehensive (loss) income attributable to noncontrolling interest			(1.6)	(1.8)
Balance as of end of period	(119.2)	(134.8)	(119.2)	(134.8)
Derivative Instruments
Other Comprehensive (Loss) Income [Roll Forward]
Balance as of beginning of period			(7.4)	(0.8)
Other comprehensive income (loss)			1.8	(2.8)
Less: Net other comprehensive (loss) income attributable to noncontrolling interest			0.0	0.0
Balance as of end of period	(5.6)	(3.6)	(5.6)	(3.6)
Accumulated Other Comprehensive Loss
Other Comprehensive (Loss) Income [Roll Forward]
Balance as of beginning of period			(154.8)	(109.5)
Other comprehensive income (loss)			31.6	(30.7)
Less: Net other comprehensive (loss) income attributable to noncontrolling interest			(1.6)	(1.8)
Balance as of end of period	$ (124.8)	$ (138.3)	$ (124.8)	$ (138.3)