INCOME TAXES - Uncertain Tax Positions (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Income Tax Contingency [Line Items]
Increase in interest and penalties	$ 8.9	$ 1.9	$ 2.6
Gross amount of interest and penalties accrued	20.2	11.2
Gross unrecognized tax benefits including interest and penalties	294.8
Gross unrealized tax benefits, which would affect effective tax rate, if realized	137.2
Increase (decrease) in unrecognized tax benefits	118.8
Possible reduction of unrecognized tax benefits within the next 12 months	61.3
Aggregate changes to the liability for gross uncertain tax position, excluding interest and penalties
Balance, beginning of period	164.8	158.3	127.5
Additions:
Current year tax positions	26.5	10.3	18.9
Prior year tax positions	109.7	4.2	21.0
Reduction of prior year tax positions	(26.3)	0.0	(1.0)
Lapse of statute of limitations	0.0	(8.0)	(8.1)
Balance, end of period	274.7	$ 164.8	$ 158.3
Zynga Inc
Additions:
Prior year tax positions	$ 109.9