INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Amount
Income tax provision at the statutory rate	$ 168.3	$ 277.0	$ 146.5
State income tax expense, net	29.8	42.7	21.0
Non-deductible items	1.7	1.6	0.6
Other, net	(1.0)	0.5	(2.8)
Total Income Tax Expense	$ 198.8	$ 321.8	$ 165.3
Percent
Income tax provision at the statutory rate	21.00%	21.00%	21.00%
State income tax expense, net	3.70%	3.20%	3.00%
Non-deductible items	0.20%	0.10%	0.10%
Other, net	(0.10%)	0.10%	(0.40%)
Income tax provision	24.80%	24.40%	23.70%