FAIR VALUE MEASUREMENTS (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($) item	Dec. 31, 2020 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Minimum number of market participants | item	4,000
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value | $	$ 4.2	$ 12.7