Income Taxes - Components of Consolidated Income Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income before income tax expense -
U.S.	$ 1,027.8	$ 1,064.4	$ 1,014.1
Income before taxes	1,027.8	1,064.4	1,014.1
Current income tax provision -
U.S. federal	113.0	218.9	199.4
State and local	43.4	44.6	44.3
Total current provision for taxes	156.4	263.5	243.7
Deferred income tax provision (benefit) -
U.S. federal	91.4	(5.5)	3.6
State and local	5.9	1.3	1.6
Total deferred provision (benefit) for taxes	97.3	(4.2)	5.2
Total income tax provision -
U.S. federal	204.4	213.4	203.0
State and local	49.3	45.9	45.9
Total provision for income taxes	$ 253.7	$ 259.3	$ 248.9