FAIR VALUE MEASUREMENTS - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Fair Value Disclosures [Abstract]
Increase in liability as a result of increasing the profit element and risk premium input by 100 basis points	$ 0.1
Decrease in liability as a result of decreasing the profit element and risk premium input by 100 basis points	0.1
Decrease in liability as a result of increasing the discount rate by 100 basis points	0.7
Increase in liability as a result of decreasing the discount rate by 100 basis points	$ 0.8