FAIR VALUE MEASUREMENTS - Segregation of All Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2023	Mar. 31, 2023
Assets:
Short-term investments	$ 23.5	$ 187.0
Total financial assets	772.9	1,133.5
Liabilities:
Contingent earn-out consideration	12.3	66.6
Contingent earn-out consideration	7.6	27.3
Convertible notes	23.2
Convertible notes	24.1	44.1
Total financial liabilities	67.3	140.5
Money market funds
Assets:
Cash and cash equivalents	355.2	368.0
Restricted cash and cash equivalents	182.8	306.1
Restricted cash and cash equivalents, long term	106.5	99.6
Bank-time deposits
Assets:
Cash and cash equivalents	75.2	145.8
Short-term investments	20.6	41.8
Restricted cash and cash equivalents	0.5	0.5
Corporate bonds
Assets:
Short-term investments	2.9	145.2
Foreign currency forward contracts
Liabilities:
Foreign currency forward contracts	0.1	2.5
Private equity
Assets:
Private equity	29.2	26.5
Quoted prices in active markets for identical assets (level 1)
Assets:
Total financial assets	740.8	961.8
Liabilities:
Contingent earn-out consideration	0.0	0.0
Contingent earn-out consideration	0.0	0.0
Convertible notes	0.0
Convertible notes	0.0	0.0
Total financial liabilities	0.0	0.0
Quoted prices in active markets for identical assets (level 1) | Money market funds
Assets:
Cash and cash equivalents	355.2	368.0
Restricted cash and cash equivalents	182.8	306.1
Restricted cash and cash equivalents, long term	106.5	99.6
Quoted prices in active markets for identical assets (level 1) | Bank-time deposits
Assets:
Cash and cash equivalents	75.2	145.8
Short-term investments	20.6	41.8
Restricted cash and cash equivalents	0.5	0.5
Quoted prices in active markets for identical assets (level 1) | Corporate bonds
Assets:
Short-term investments	0.0	0.0
Quoted prices in active markets for identical assets (level 1) | Foreign currency forward contracts
Liabilities:
Foreign currency forward contracts	0.0	0.0
Quoted prices in active markets for identical assets (level 1) | Private equity
Assets:
Private equity	0.0	0.0
Significant other observable inputs (level 2)
Assets:
Total financial assets	2.9	145.2
Liabilities:
Contingent earn-out consideration	0.0	0.0
Contingent earn-out consideration	0.0	0.0
Convertible notes	23.2
Convertible notes	24.1	44.1
Total financial liabilities	47.4	46.6
Significant other observable inputs (level 2) | Money market funds
Assets:
Cash and cash equivalents	0.0	0.0
Restricted cash and cash equivalents	0.0	0.0
Restricted cash and cash equivalents, long term	0.0	0.0
Significant other observable inputs (level 2) | Bank-time deposits
Assets:
Cash and cash equivalents	0.0	0.0
Short-term investments	0.0	0.0
Restricted cash and cash equivalents	0.0	0.0
Significant other observable inputs (level 2) | Corporate bonds
Assets:
Short-term investments	2.9	145.2
Significant other observable inputs (level 2) | Foreign currency forward contracts
Liabilities:
Foreign currency forward contracts	0.1	2.5
Significant other observable inputs (level 2) | Private equity
Assets:
Private equity	0.0	0.0
Significant unobservable inputs (level 3)
Assets:
Total financial assets	29.2	26.5
Liabilities:
Contingent earn-out consideration	12.3	66.6
Contingent earn-out consideration	7.6	27.3
Convertible notes	0.0
Convertible notes	0.0	0.0
Total financial liabilities	19.9	93.9
Significant unobservable inputs (level 3) | Money market funds
Assets:
Cash and cash equivalents	0.0	0.0
Restricted cash and cash equivalents	0.0	0.0
Restricted cash and cash equivalents, long term	0.0	0.0
Significant unobservable inputs (level 3) | Bank-time deposits
Assets:
Cash and cash equivalents	0.0	0.0
Short-term investments	0.0	0.0
Restricted cash and cash equivalents	0.0	0.0
Significant unobservable inputs (level 3) | Corporate bonds
Assets:
Short-term investments	0.0	0.0
Significant unobservable inputs (level 3) | Foreign currency forward contracts
Liabilities:
Foreign currency forward contracts	0.0	0.0
Significant unobservable inputs (level 3) | Private equity
Assets:
Private equity	$ 29.2	$ 26.5