LEASES - Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 38.6	$ 35.0
Impairment of operating lease ROU assets	0.5	0.9
Total operating lease cost	39.1	35.9
Amortization of ROU assets	2.0	1.7
Finance Lease, Interest Expense	0.2	0.2
Finance Lease Cost	2.2	1.9
Variable lease cost	3.0	2.6
Short-term lease cost	0.0	0.2
Total lease cost	$ 44.3	$ 40.6