REVENUE - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue recognized			$ 228.9
Deferred revenue	$ 354.0		354.0
Unrecognized accounts receivable and deferred revenue	5.4		5.4		$ 11.1
Capitalized contract cost	7.5		7.5		7.2
Amortization of capitalized costs to obtain contracts	1.6	$ 1.6	4.7	$ 4.8
Prepaid Expenses and Other Current Assets
Disaggregation of Revenue [Line Items]
Capitalized contract cost	4.2		4.2		3.9
Other Assets
Disaggregation of Revenue [Line Items]
Capitalized contract cost	$ 3.3		$ 3.3		$ 3.3
Minimum
Disaggregation of Revenue [Line Items]
Payment terms			30 days
Maximum
Disaggregation of Revenue [Line Items]
Payment terms			90 days