INCOME TAXES (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Amount
Income tax provision at the statutory rate	$ 277.0	$ 146.5	$ 71.0
State income tax expense, net	42.7	21.0	10.1
Non-deductible items	1.6	0.6	1.3
Other, net	0.5	(2.8)	1.3
Total Income Tax Expense	$ 321.8	$ 165.3	$ 83.8
Percent
Income tax provision at the statutory rate	21.00%	21.00%	21.00%
State income tax expense, net	3.20%	3.00%	3.00%
Non-deductible items	0.10%	0.10%	0.40%
Other, net	0.10%	(0.40%)	0.40%
Income tax provision	24.40%	23.70%	24.80%