Shareholders' Equity - Other Comprehensive Loss and Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of beginning of period	$ 1,831.6	$ 1,738.0	$ 1,940.0
Other comprehensive income (loss)	(17.3)	(6.3)	29.8
Less: Net other comprehensive (income) loss attributable to noncontrolling interest	2.7	1.2
Balance as of end of period	1,893.9	1,831.6	1,738.0
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of beginning of period	(145.0)	(118.8)
Other comprehensive income (loss)	8.2	(27.3)
Less: Net other comprehensive (income) loss attributable to noncontrolling interest	2.7	1.2
Balance as of end of period	(134.1)	(145.0)	(118.8)
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of beginning of period	13.3	(7.7)
Other comprehensive income (loss)	(25.5)	21.0
Less: Net other comprehensive (income) loss attributable to noncontrolling interest	0.0	0.0
Balance as of end of period	(12.2)	13.3	(7.7)
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of beginning of period	(131.7)	(126.5)	(154.8)
Other comprehensive income (loss)	(14.6)	(5.2)	28.3
Balance as of end of period	$ (146.3)	$ (131.7)	$ (126.5)