LEASES, Operating Lease That Has Not Yet Commenced (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Operating lease that has not yet commenced [Abstract]
Lease term			5 years
Right-of-use assets			$ 0.6
Lease liabilities			$ 0.6
Rental expense	$ 9.0	$ 7.3