INCOME TAXES - Components of income tax expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current tax expense:
Federal	$ 208.8	$ 188.1	$ 210.4
State	117.7	97.8	130.2
Foreign	16.0	15.5	13.0
Total current tax expense	342.5	301.4	353.6
Deferred income tax (benefit) expense:
Federal	(19.5)	(3.4)	(126.2)
State	(2.4)	1.5	(22.7)
Foreign	(1.7)	(13.3)	(6.8)
Total deferred income tax benefit	(23.6)	(15.2)	(155.7)
Total	$ 318.9	$ 286.2	$ 197.9