Shareholders' Equity - Share Repurchase and Dividends (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	May 31, 2021	May 31, 2019
May 2019 Repurchase Program
Shareholders' Equity
Amount approved for repurchase of common stock						$ 300.0
Common stock repurchased during the period (in shares)		24,873		555,602
Aggregate cost of common stock repurchased during the period		$ 1.7		$ 34.5
May 2021 Repurchase Program
Shareholders' Equity
Amount approved for repurchase of common stock					$ 500.0
Common stock repurchased during the period (in shares)	983,741	530,703	2,586,796	530,703
Aggregate cost of common stock repurchased during the period	$ 60.3	$ 36.6	$ 165.9	$ 36.6
Remaining authorization amount for repurchase of common stock	$ 215.3		$ 215.3