COMMITMENTS AND CONTINGENCIES - Narrative (Details) R$ in Millions, $ in Millions		3 Months Ended			12 Months Ended
	Apr. 21, 2016 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2020 USD ($) tax_assessment	Mar. 31, 2020 BRL (R$) tax_assessment
Loss Contingencies [Line Items]
Inventory impairment and other		$ 74.8	$ 84.0	$ 70.0	$ 84.0
SunEdison, Inc
Loss Contingencies [Line Items]
Inventory impairment and other	$ 61.0
Sales returns recognized	90.0
Pending Litigation | SunEdison, Inc Filed Chapter 11 | Collectibility of Receivables
Loss Contingencies [Line Items]
Inventory received	98.6
Cash received	$ 69.2
Foreign Tax Authority | Intercompany Payment Deductibility
Loss Contingencies [Line Items]
Sales and import taxes, estimate of possible loss					$ 94.0
Foreign Tax Authority | Brazil | Assessment of Sales and Import Taxes
Loss Contingencies [Line Items]
Sales and import taxes, number of tax assessments | tax_assessment					6	6
Sales and import taxes, estimate of possible loss					$ 73.1	R$ 373.7
Foreign Tax Authority | Pending Litigation | Brazil | Assessment of Sales and Import Taxes
Loss Contingencies [Line Items]
Sales and import taxes, estimate of possible loss					11.8	60.5
Sales and import taxes, estimate of possible loss unsuccessful					$ 6.6	R$ 33.9