COMMITMENTS AND CONTINGENCIES - Insurance Programs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Health insurance	$ 15.1	$ 15.8
Workers’ compensation	35.8	33.4
Professional liability	4.9	5.1
Estimated Insurance Total	55.8	54.3
Less: long-term portion	(1.2)	(1.3)
Estimated Insurance Excluding Long Term Portion	$ 54.6	$ 53.0