Subsequent Events (Details) - USD ($) shares in Millions, $ in Millions	1 Months Ended	3 Months Ended				9 Months Ended
	Nov. 02, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Subsequent Event [Line Items]
Payments for Repurchase of Common Stock		$ 399.0	$ 465.0	$ 122.0	$ 29.0	$ 987.0	$ 29.0
Common Stock [Member]
Subsequent Event [Line Items]
Common stock, Shares acquired		(7.0)	(7.0)	(2.0)	(1.0)
Subsequent Event [Member]
Subsequent Event [Line Items]
Payments for Repurchase of Common Stock	$ 150.0
Subsequent Event [Member] | Common Stock [Member]
Subsequent Event [Line Items]
Purchase of stock	2.3