Income Taxes - Pre-tax Income and Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Continuing operations
U.S. domestic	$ 417.3	$ 353.3	$ 487.3
Foreign	65.2	50.9	87.8
Income from continuing operations before income taxes	482.5	404.2	575.1
Discontinued operations
U.S. domestic	(117.2)	(21.8)	(4.4)
Foreign	127.1	13.5	22.8
Income (loss) from discontinued operations before income taxes	9.9	(8.3)	18.4
Total income before income taxes	492.4	395.9	593.5
Current provision:
Federal and State	74.7	86.0	108.5
Foreign	22.8	18.6	17.7
Total current provision	97.5	104.6	126.2
Deferred provision (benefit):
Federal and State	7.2	(14.8)	(7.3)
Foreign	(9.2)	(11.3)	(1.6)
Total deferred benefit	(2.0)	(26.1)	(8.9)
Total provision for income taxes	95.5	78.5	117.3
Reconciliation of taxes from continuing operations
Taxes at U.S. statutory rate	101.3	84.9	120.8
State and local taxes, net of federal income tax benefit	14.8	11.5	16.2
Foreign earnings taxed at different rates	0.3	1.7	(1.6)
Equity compensation windfall	(13.7)	(2.1)	(4.4)
Change in unrecognized tax benefit	(10.0)	(11.5)	(3.1)
Return to provision adjustments	0.7	(2.5)	(7.3)
Tax credits	(4.7)	(4.3)	(4.5)
Other, net	6.8	0.8	1.2
Provision for income taxes	$ 95.5	$ 78.5	$ 117.3
Effective income tax rate on continuing operations (as a percent)	19.80%	19.40%	20.40%
Income Taxes Paid, Net [Abstract]
Cash payments for income taxes, net of refunds	$ 132.8	$ 116.6	$ 113.0