Stockholders' Equity Common Stock Repurchase (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchase Program, Authorized Amount			$ 250.0
Stock Repurchased and Retired During Period, Shares	297,000	2,066,479
Weighted Average Selling Price Per Share	$ 30.77	$ 34.65
Stock Repurchased and Retired During Period, Value	$ (9.2)	$ (71.7)
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchased and Retired During Period, Shares	300,000	2,100,000