BUSINESS COMBINATION - Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Feb. 24, 2020	Mar. 31, 2020	Mar. 31, 2019
Business Acquisition [Line Items]
Acquisitions funded by deferred consideration		$ 1.7	$ 0.0
Coram Material Corp.
Business Acquisition [Line Items]
Accounts receivable	$ 2.0
Inventory	10.0
Other current assets	0.3
Property, plant and equipment	130.9
Total assets acquired	143.2
Current liabilities	0.1
Other long-term liabilities	0.2
Total liabilities assumed	0.3
Total consideration (fair value)	142.9
Acquisitions funded by deferred consideration	1.7
Accounts payable	0.6
Maximum contingent consideration	$ 2.0
Contingent consideration payment period (years)	2 years