INCOME TAXES - Provision for income taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Current tax expense:
Federal	$ 287.6	$ 208.8	$ 188.1
State	162.9	117.7	97.8
Foreign	24.5	16.0	15.5
Total current tax expense	475.0	342.5	301.4
Deferred income tax (benefit) expense:
Federal	(7.9)	(19.5)	(3.4)
State	8.4	(2.4)	1.5
Foreign	(8.9)	(1.7)	(13.3)
Total deferred income tax benefit	(8.4)	(23.6)	(15.2)
Total	$ 466.6	$ 318.9	$ 286.2