OPERATING LEASES, LEASE COST (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)
OPERATING LEASES [Abstract]
Operating lease cost	$ 3.1	$ 8.3
Short-term lease cost	$ 0.3	$ 0.5
Weighted-average remaining lease term	3 years 4 months 24 days	3 years 4 months 24 days
Weighted-average discount rate	3.60%	3.60%
Lessee, Operating Lease, Lease Not Yet Commenced, ROU Asset	$ 2.3	$ 2.3