BUSINESS COMBINATION - Schedule of Adjustments Reflected in Pro Forma Net Income (Loss) and Net Income (Loss) Per Share Amounts (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Increase in intangible amortization expense	$ (5.3)	$ (6.0)
Increase in interest expense	(11.4)	(11.6)
Increase in income tax expense	4.9	0.7
Coram Material Corp. | Acquisition-related costs
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Decrease (increase) in cost of goods sold related to fair value increase in inventory	1.6	(0.8)
Increase in intangible amortization expense	(0.9)	(0.9)
Exclusion of buyer transaction costs	0.5	0.0
Exclusion of seller transaction costs	0.3	0.0
Increase in interest expense	(0.8)	(1.0)
Increase in income tax expense	$ (1.1)	$ (0.2)