SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Accounting Policies [Abstract]
Carried interest distribution	$ 0.1		$ 0.2		$ 0.3
Accrued clawback obligations	7.2		7.2		$ 7.2
Reversal of previously recognized carried interest, less than	$ 0.1	$ 0.1	$ 0.1	$ 0.1