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INVESTMENTS - Narrative (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) | Dec. 31, 2020 investment
Debt and Equity Securities, FV-NI [Line Items] |  |
Number of investments | investment |  | 0
Upward price adjustments | $ 1.0 |
Other income, net |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Increase in non-marketable equity securities due to observable price changes | 4.8 |
Decrease in non-marketable equity securities due to observable price changes | $ 2.6 |

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