REVENUE - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue recognized			$ 168.4
Deferred revenue	$ 349.2		349.2
Unrecognized accounts receivable and deferred revenue	8.9		8.9		$ 7.1
Capitalized contract cost	7.3		7.3		7.4
Amortization of capitalized costs to obtain contracts	1.5	$ 1.5	3.1	$ 3.1
Prepaid Expenses and Other Current Assets
Disaggregation of Revenue [Line Items]
Capitalized contract cost	4.1		4.1		4.1
Other Assets
Disaggregation of Revenue [Line Items]
Capitalized contract cost	$ 3.2		$ 3.2		$ 3.3
Minimum
Disaggregation of Revenue [Line Items]
Payment terms			30 days
Maximum
Disaggregation of Revenue [Line Items]
Payment terms			90 days