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INCOME TAXES (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Dec. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Effective Income Tax Rate Reconciliation, Amount
Statutory federal income tax, amount		$ 100.5
State income taxes net of federal tax benefit, amount		29.9
Federal tax reform, amount		(15.5)
Tax repairs, amount		(25.5)
Other, amount		(1.1)
Total income tax expense, amount		$ 88.3	$ 213.3
Effective Income Tax Rate Reconciliation, Percent
Statutory federal income tax, percentage		21.00%	35.00%
State income taxes net of federal tax benefit, percentage		6.20%
Federal tax reform, percentage		(3.20%)
Tax repairs, percentage		(5.30%)
Other, percentage		(0.30%)
Total income tax expense, percentage		18.40%
Measurement period to complete accounting related to Tax Cuts and Jobs Act	1 year

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