Share-based Compensation - Options (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, Outstanding, Number, period start	5,633,622
Options, Outstanding, Weighted Average Exercise Price, period start	$ 15.83
Options, Grants in Period, Gross	835,615
Options, Grants in Period, Weighted Average Exercise Price	$ 47.41
Options, Exercises in Period	(1,179,032)
Options, Exercises in Period, Weighted Average Exercise Price	$ 14.09
Options, Forfeitures and Expirations in Period	(324,831)
Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$ 28.06
Options, Outstanding, Number, period end	4,965,374	5,633,622
Options, Outstanding, Weighted Average Exercise Price, period end	$ 20.76	$ 15.83
Options, Outstanding, Weighted Average Remaining Contractual Term	6 years 3 months 21 days
Options, Outstanding, Intrinsic Value	$ 101.8
Options, Vested and Expected to Vest, Outstanding, Number	4,965,374
Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price	$ 20.76
Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term	6 years 3 months 21 days
Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	$ 101.8
Options, Vested and Expected to Vest, Exercisable, Number	3,207,090
Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price	$ 14.98
Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term	5 years 1 month 13 days
Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value	$ 80.9
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 18.21	$ 20.74	$ 16.46
Options, Exercises in Period, Intrinsic Value	$ 33.5	$ 49.7	$ 10.6
Proceeds from Stock Options Exercised	$ 16.6	$ 66.2	$ 16.5