Stockholders' Equity (Details) - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Aug. 20, 2021
Share Repurchases [Abstract]
Number of Shares Authorized to be Repurchased	6,600
Additional Shares Authorized to be Repurchased				3,000
Treasury Stock, Shares, Acquired	1,800	1,500	0
Payments of Dividends	$ 45.9	$ 6.5	$ 6.6
Special Dividend	39.5
Regular Dividend	$ 6.4	$ 6.5	$ 6.6