Treasury Stock Transactions (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Treasury Stock, Value [Abstract]
Number of Treasury Shares Repurchased		1,735,500	0	3,078,600	0
Cost of Shares Repurchased	[1]	$ 57.4	$ 0.0	$ 94.9	$ 0.0
Commissions Paid on Stock Repurchases		$ 0.1		$ 0.1

[1] Includes commissions of $0.1 million for the three and six months ended June 30, 2022.