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FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) shares in Millions |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 22, 2021 | Dec. 31, 2020
Assets and Liabilities Measured at Fair Value on a Recurring Basis |  |  |  |  |
Carrying value of investments in equity securities without readily determinable fair value | $ 14,200,000 | $ 14,200,000 |  |  | $ 14,200,000
Gross unrealized losses of downward adjustments to the carrying value of equity securities without readily determinable fair values | $ 2,100,000 | 2,100,000 |  |  |
Impairment charge on equity securities without readily determinable fair value |  | $ 0 | $ 0 |  |
2022 Exchangeable Notes | Senior Notes |  |  |  |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis |  |  |  |  |
Debt conversion, shares issuable upon conversion (in shares) | 5.5 | 5.5 |  |  |
Corresponding loss on embedded derivative | $ 38,600,000 |  |  |  |
2022 Exchangeable Notes | Senior Notes | Accrued expenses and other current liabilities |  |  |  |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis |  |  |  |  |
Fair value of embedded derivative liability | $ 38,600,000 | $ 38,600,000 |  | $ 0 |

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