INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Components of Deferred Tax Assets [Abstract]
Accrued expenses	$ 7.7	$ 6.8
Vacation accrual	0.7	0.5
Accounts receivable	1.1	0.8
Net operating losses	0.7	0.4
Deferred start-up costs	0.9	1.0
Stock based compensation	3.5	3.5
Operating lease liabilities	26.8	28.8
Interest expense limitation carryforward	11.9	6.1
Total	53.3	47.9
Valuation allowance	(0.4)	(0.3)
Total deferred tax assets	52.9	47.6
Deferred tax liabilities
Prepaid expenses	(4.1)	(3.2)
Intangible assets	(14.5)	(15.9)
Property and equipment	(102.5)	(96.2)
Right of Use Asset	(25.4)	(27.3)
Total deferred tax liabilities	(146.5)	(142.6)
Net deferred tax liability	$ (93.6)	$ (95.0)