Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Statutory federal income tax rate	$ 304.5	$ 312.4	$ 272.5
State taxes, net of federal effect	55.8	61.1	50.3
Excess tax benefit of equity awards	(29.6)	(12.0)	(30.1)
Tax on foreign earnings	8.5	3.0	1.7
Effect of tax law changes	0.0	0.0	4.8
Other	6.7	8.8	10.0
Income tax expense	$ 345.9	$ 373.3	$ 309.2
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory federal income tax rate, percent	21.00%	21.00%	21.00%
State taxes, net of federal effect, percent	3.80%	4.10%	3.90%
Excess tax benefit of equity awards, percent	(2.00%)	(0.80%)	(2.30%)
Tax on foreign earnings, percent	0.60%	0.20%	0.10%
Effect of tax law changes, percent	0.00%	0.00%	0.40%
Other, percent	0.50%	0.60%	0.70%
Effective tax rate, percent	23.90%	25.10%	23.80%