Equity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Securities Repurchase Program
Repurchase of common stock	$ 293.5	$ 34.4	$ 174.1
Securities Repurchase Program
Securities Repurchase Program
Repurchased shares (in shares)	3,112,404	890,195	3,871,887
Repurchase of common stock	$ 280.6	$ 29.4	$ 169.2
Repurchased shares, average price (in dollars per share)	$ 90.13	$ 33.06	$ 43.71
Amount authorized to be repurchased	$ 230.4
Acquired Employee Equity Awards
Securities Repurchase Program
Repurchased shares (in shares)	149,176	137,541	114,949
Repurchase of common stock	$ 12.9	$ 5.0	$ 4.9
Repurchased shares, average price (in dollars per share)	$ 86.78	$ 36.34	$ 42.72