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STOCK-BASED COMPENSATION - Aggregate (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Stock-based compensation
Aggregate stock-based compensation charges	$ 1.1	$ 0.9	$ 2.0	$ 1.9
Stock Option
Stock-based compensation
Unrecognized stock-based compensation expense	3.4		$ 3.4
Weighted average period of recognition			2 years 4 months 24 days
Deferred Compensation	0.1		$ 0.1
Restricted Stock Units (RSUs)
Stock-based compensation
Unrecognized stock-based compensation expense	3.7		$ 3.7
Weighted average period of recognition			1 year 10 months 24 days
Performance Stock Units
Stock-based compensation
Deferred Compensation	$ 0.5		$ 0.5