REVENUE RECOGNITION - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue recognized	$ 97.2
Deferred revenue	342.0
Unrecognized accounts receivable and deferred revenue	7.0		$ 23.3
Capitalized contract cost	6.7		6.4
Amortization of capitalized costs to obtain contracts	$ 1.6	$ 0.6
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	$ 4.3		3.8
Other assets
Disaggregation of Revenue [Line Items]
Capitalized contract cost	$ 2.4		$ 2.6