Shareholders' Equity - Share Repurchase and Dividends (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	May 31, 2021	Jun. 30, 2021	Jun. 30, 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)		530,703
Aggregate cost of common stock repurchased during the period		$ 36.6
Remaining authorization amount for repurchase of common stock		$ 463.4	$ 463.4
Stock repurchase program,Purchase of common stock from time to time, period	2 years