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FINANCIAL INSTRUMENTS - Narrative (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Feb. 15, 2019 USD ($) | Dec. 31, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Unrealized (loss) gain on marketable equity security | $ (4,600,000) |  |  | $ 25,300,000 |  |  |
Gross realized gains | 0 |  | $ 0 | 0 | $ 0 |  |
Gross realized losses | 0 |  | $ 0 | 0 | $ 0 |  |
Assets measured at fair value on a nonrecurring basis |  |  |  |  |  |  |
Equity securities without readily determinable fair values | 334,000,000.0 |  |  | 334,000,000.0 |  |  | $ 235,100,000
Total upward adjustments to equity securities without readily determinable fair value | 300,000 |  |  | 300,000 |  |  |
Total downward adjustments to equity securities without readily determinable fair value | 3,000,000.0 |  |  | 3,000,000.0 |  |  |
Contingent Consideration Arrangements |  |  |  |  |  |  |
Total maximum contingent payment | 45,000,000.0 |  |  | 45,000,000.0 |  |  |
Gross fair value, before unamortized discount | 22,300,000 |  |  | 22,300,000 |  |  |
Payment to settle contingent consideration arrangement |  | $ 2,000,000.0 |  |  |  |  |
Current portion | 2,000,000.0 |  |  | 2,000,000.0 |  |  | 2,000,000.0
Non-current portion | 11,700,000 |  |  | 11,700,000 |  |  | 26,600,000
Match Group |  |  |  |  |  |  |
Contingent Consideration Arrangements |  |  |  |  |  |  |
Aggregate principal amount | 1,625,000,000 |  |  | 1,625,000,000 |  |  | 1,535,000,000
Match Group | Credit Facility | MTCH Credit Facility |  |  |  |  |  |  |
Contingent Consideration Arrangements |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  |  |  |  | 500,000,000
Aggregate principal amount | 0 |  |  | 0 |  |  | 260,000,000
Match Group | Senior Notes | 5.625% MTCH Senior Notes |  |  |  |  |  |  |
Contingent Consideration Arrangements |  |  |  |  |  |  |
Aggregate principal amount | $ 350,000,000 |  |  | $ 350,000,000 |  | $ 350,000,000 | $ 0
Stated interest rate (as a percent) | 5.625% |  |  | 5.625% |  | 5.625% |
Measurement Input, Discount Rate | Contingent Consideration Arrangements |  |  |  |  |  |  |
Contingent Consideration Arrangements |  |  |  |  |  |  |
Contingent consideration, discount rate | 0.25 |  |  | 0.25 |  |  |
Minimum | Measurement Input, Discount Rate | Contingent Consideration Arrangements |  |  |  |  |  |  |
Contingent Consideration Arrangements |  |  |  |  |  |  |
Contingent consideration, discount rate |  |  |  |  |  |  | 0.12
Maximum | Measurement Input, Discount Rate | Contingent Consideration Arrangements |  |  |  |  |  |  |
Contingent Consideration Arrangements |  |  |  |  |  |  |
Contingent consideration, discount rate |  |  |  |  |  |  | 0.25
Turo |  |  |  |  |  |  |
Contingent Consideration Arrangements |  |  |  |  |  |  |
Equity method investments | $ 250,000,000 |  |  | $ 250,000,000 |  |  |

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