LEASES - Supplemental Cashflow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating cash flow from operating leases	$ (38.2)	$ (35.8)
Financing cash flow from finance leases	(2.0)	(1.7)
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	38.5	116.0
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	1.2	2.9
Lessee Operating lease Reductions to ROU assets resulting from reductions to lease obligations	(1.1)	(1.7)
Lessee Finance lease Reduction to ROU assets resulting from reductions to lease obligations	$ 0.0	$ 0.0