Stockholders' Equity (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Treasury stock, acquired (in shares)	4.4	1.6	16.6	10.0
Payments for repurchase of common stock	$ 117.0	$ 61.6	$ 566.2	$ 361.4
Value of treasury stock acquired	117.0	61.6	566.2	361.4
Performance-based Restricted Stock Units
Accumulated Other Comprehensive Income (Loss) [Line Items]
Value of treasury stock acquired	0.2	$ 0.8	45.8	$ 14.1
February 2016 Program
Accumulated Other Comprehensive Income (Loss) [Line Items]
Remaining shares under share repurchase authorization	$ 834.5		$ 834.5