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Stockholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Apr. 30, 2021	Feb. 28, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Increase (decrease) in authorization amount					$ 325.3	$ 211.4
Treasury stock, acquired (in shares)	1,600,000	0	10,000,000.0	2,600,000
Value of treasury stock acquired	$ 61.6		$ 361.4	$ 187.5
Payments for repurchase of common stock			361.4	187.5
Performance-based Restricted Stock Units
Accumulated Other Comprehensive Income (Loss) [Line Items]
Value of treasury stock acquired	0.8	$ 0.2	14.1	$ 12.0
February 2016 Program
Accumulated Other Comprehensive Income (Loss) [Line Items]
Remaining shares under share repurchase authorization	$ 376.8		$ 376.8

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