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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Mar. 31, 2020
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Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible debt, fair value | $ 502.9 | $ 309.6

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