INCOME TAXES - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Operating Loss Carryforwards [Line Items]
Income resulting from tax holidays and tax incentives	$ 21.2	$ 15.6	$ 24.4
Effect on basic loss per share due to income resulting from tax holidays and tax incentives (in dollars per share)	$ 0.04	$ 0.03	$ 0.05
Effect on diluted loss per share due to income resulting from tax holidays and tax incentives (in dollars per share)	$ 0.04	$ 0.03	$ 0.05
Tax effect of foreign income not repatriated to Singapore	$ 57.3	$ 27.9	$ 7.5
Deferred tax asset associated with tax loss and tax credit carryforwards of indefinite duration	1,800.0
Valuation allowance relating to deferred tax assets	82.9
Undistributed earnings of subsidiaries	1,500.0
Unrecognized tax benefits	266.0	246.0	252.0
Unrecognized tax benefits affect annual effective tax rate if benefits eventually recognized	173.0
Interest and penalties recognized	2.1	(0.9)	(2.9)
Amount accrued for the payment of interest	14.4	12.3	13.3
Maximum
Operating Loss Carryforwards [Line Items]
Increase in unrecognized tax benefit	22.0
Singapore | Subsidiaries
Operating Loss Carryforwards [Line Items]
Deferred tax liability not recognized undistributed earnings of its subsidiaries	134.8
China | Subsidiaries
Operating Loss Carryforwards [Line Items]
Undistributed foreign earnings that applicable foreign withholding taxes have been provided	12.6
Deferred tax liability on undistributed foreign earnings	0.6
Valuation Allowance and Deferred Tax Assets, Profitability Forecasted
Operating Loss Carryforwards [Line Items]
Increase (decrease) in valuation allowance	24.5	1.1	2.8
Valuation Allowance and Deferred Tax Assets, Current Period Losses
Operating Loss Carryforwards [Line Items]
Increase (decrease) in valuation allowance	$ 60.0	$ 90.2	$ 194.8