Equity-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of Options (in shares):
Options outstanding, beginning (in shares)	4,480,772
Granted (in shares)	786,601
Forfeitures/Expired (in shares)	(63,947)
Exercised (in shares)	(1,065,184)
Options outstanding, ending (in shares)	4,138,242	4,480,772
Options Weighted Average Exercise Price (in dollars per share):
Options outstanding, beginning weighted-average exercise price (in dollars per share)	$ 46.82
Grants, weighted average exercise price (in dollars per share)	96.24
Forfeitures and Expirations, weighted average exercise price (in dollars per share)	74.56
Exercises, weighted average exercise price (in dollars per share)	32.80
Options outstanding, ending weighted-average exercise price (in dollars per share)	$ 59.39	$ 46.82
Options, outstanding, weighted average remaining contractual term	6 years 2 months 1 day
Options, outstanding intrinsic value	$ 345.3
Options, exercisable (in shares)	2,364,405
Options, exercisable, weighted average exercise price (in dollars per share)	$ 43.61
Options, exercisable, weighted average remaining contractual term (years)	4 years 11 months 26 days
Options, exercisable, Intrinsic Value	$ 234.6
Options, vested and expected to vest, Outstanding (in shares)	1,752,687
Options, vested and expected to vest, weighted average exercise price (in dollars per share)	$ 80.34
Options, vested and expected to vest, outstanding, weighted average remaining contractual term (in years)	7 years 8 months 19 days
Options, vested and expected to vest, aggregate intrinsic value	$ 109.5
Total intrinsic value of stock options exercised	$ 83.0	$ 47.0	$ 17.0