INCOME TAXES (Schedule of Components of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ 46.3	$ 43.8	$ 59.1
State	8.0	7.1	8.3
Total Current Income Tax Expense	54.3	50.9	67.4
Deferred:
Federal	5.5	3.9	1.2
State	(0.3)	2.0	1.4
Total Deferred Income Tax Expense	5.2	5.9	2.6
Total Income Tax Expense	$ 59.5	$ 56.8	$ 70.0