INCOME TAXES - Reconciliation Between Income Tax Expense and Computed Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax at Federal statutory rate	$ 18.4	$ 17.6	$ 13.9
State and local income taxes, net of federal tax benefit	2.9	3.0	2.4
Impact of state rate changes	0.0	0.0	0.1
Reversal of valuation allowances	(3.4)	(0.9)	(0.3)
Stock based compensation	(0.8)	(0.5)	(0.5)
Non-deductible items	0.5	0.8	0.8
Other items, net	(0.1)	(0.1)	(0.3)
Income tax	$ 17.5	$ 19.9	$ 16.1
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Income tax at Federal statutory rate	21.00%	21.00%	21.00%
State and local income taxes, net of federal tax benefit	3.30%	3.50%	3.70%
Impact of state rate changes	0.00%	0.00%	0.10%
Reversal of valuation allowances	(3.80%)	(1.00%)	(0.40%)
Stock based compensation	(0.90%)	(0.60%)	(0.80%)
Non-deductible items	0.50%	0.90%	1.20%
Other items, net	(0.10%)	(0.10%)	(0.40%)
Income tax	20.00%	23.70%	24.40%