REVENUE RECOGNITION - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue recognized			$ 175.4
Deferred revenue	$ 331.2		331.2
Unrecognized accounts receivable and deferred revenue	5.0		5.0		$ 23.3
Capitalized contract cost	6.2		6.2		6.4
Amortization of capitalized costs to obtain contracts	1.6	$ 1.8	$ 3.2	$ 3.3
Minimum
Disaggregation of Revenue [Line Items]
Payment terms			30 days
Maximum
Disaggregation of Revenue [Line Items]
Payment terms			90 days
Prepaid expenses and other current assets
Disaggregation of Revenue [Line Items]
Capitalized contract cost	3.6		$ 3.6		3.8
Other assets
Disaggregation of Revenue [Line Items]
Capitalized contract cost	$ 2.6		$ 2.6		$ 2.6