INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
INCOME TAXES
Effective tax rate (as a percent)	6.00%	1.50%	(98.80%)	(6.70%)
Benefit from the reversal of unrecognized tax positions due to statute expiration		$ 0.4	$ 3.4	$ 2.9
Interest on unrecognized tax position	$ 0.5		$ 1.5	1.4
Change in valuation allowance		0.2		0.6
Income Tax Benefit, Utilization of Losses at Higher Rate, Coronavirus Aid, Relief, and Economic Security Act		$ 0.6		$ 1.0