Income Taxes - Pre-tax Income and Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Continuing operations:
U.S. domestic	$ 942.1	$ 1,106.5	$ 924.1
Foreign	6.7	4.4	6.3
Income from continuing operations before income taxes	948.8	1,110.9	930.4
Discontinued operations:
U.S. domestic	0.3	(15.2)	(121.9)
Foreign	0.0	495.5	143.6
Income from discontinued operations before income taxes	0.3	480.3	21.7
Total income before income taxes	949.1	1,591.2	952.1
Current provision:
Federal	153.4	231.7	195.8
State	41.9	50.4	39.4
Foreign	1.2	22.8	4.5
Total current provision	196.5	304.9	239.7
Deferred provision:
Federal	15.5	(27.8)	(18.2)
State	(1.7)	(7.8)	(2.0)
Foreign	(4.0)	(23.5)	(8.0)
Total deferred provision	9.8	(59.1)	(28.2)
Total provision for income taxes	$ 206.3	$ 245.8	$ 211.5