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INCOME TAXES - Uncertain Tax Positions (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Income Tax Contingency [Line Items]      
Increase in interest and penalties $ 13.5 $ 8.9 $ 1.9
Gross amount of interest and penalties accrued 33.6 20.2  
Gross unrecognized tax benefits including interest and penalties 276.3    
Gross unrealized tax benefits, which would affect effective tax rate, if realized 167.9    
Increase (decrease) in unrecognized tax benefits 18.5    
Possible reduction of unrecognized tax benefits within the next 12 months 38.6    
Aggregate changes to the liability for gross uncertain tax position, excluding interest and penalties      
Balance, beginning of period 274.7 164.8 158.3
Additions:      
Current year tax positions 41.4 26.5 10.3
Prior year tax positions 2.3 109.7 4.2
Reduction of prior year tax positions 0.0 (26.3) 0.0
Lapse of statute of limitations (76.2) 0.0 (8.0)
Other 0.6 0.0 0.0
Balance, end of period $ 242.8 274.7 $ 164.8
Zynga Inc      
Additions:      
Prior year tax positions   $ 109.7