COMMITMENTS AND CONTINGENCIES OPERATING LEASES (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
OPERATING LEASES [Abstract]
Operating lease cost	$ 2.4	$ 5.2
Short-term lease cost	$ 0.0	$ 0.1
Weighted-average remaining lease term	6 years	6 years
Weighted-average discount rate	3.90%	3.90%
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 4.8	$ 4.8
Lessee, Operating Lease, Liability, Payments, Due Year Two	7.9	7.9	$ 5.9
Lessee, Operating Lease, Liability, Payments, Due Year Three	5.4	5.4	3.5
Lessee, Operating Lease, Liability, Payments, Due Year Four	3.4	3.4	2.0
Lessee, Operating Lease, Liability, Payments, Due Year Five	2.3	2.3	1.1
Lessee, Operating Lease, Liability, Payments, Due after Year Five	$ 5.8	$ 5.8	5.7
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months			$ 8.9