LEASES - Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating leases, weighted average remaining lease term (years)	8 years 8 months 12 days	8 years 4 months 24 days
Operating leases, weighted average discount rate (percent)	5.20%	5.70%
ROU assets obtained in exchange for operating lease obligations	$ 28.7	$ 16.5	$ 0.0