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Equity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Securities Repurchase Program
Repurchase of common stock	$ 34.4	$ 174.1	$ 68.9
Securities Repurchase Program
Securities Repurchase Program
Repurchased shares	890,195	3,871,887	1,467,886
Repurchase of common stock	$ 29.4	$ 169.2	$ 63.1
Repurchased shares, average price (in dollars per share)	$ 33.06	$ 43.71	$ 43.00
Amount authorized to be repurchased	$ 170.6
Acquired Employee Equity Awards
Securities Repurchase Program
Repurchased shares	137,541	114,949	119,608
Repurchase of common stock	$ 5.0	$ 4.9	$ 5.8
Repurchased shares, average price (in dollars per share)	$ 36.34	$ 42.72	$ 48.61

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