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CONTINGENCIES - Narrative (Details) | Sep. 03, 2020 arbitration | Jul. 13, 2020 plaintiff | Jun. 13, 2019 plaintiff | Aug. 31, 2018 plaintiff | Aug. 14, 2018 USD ($) plaintiff | Mar. 31, 2021 USD ($) lawsuit
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Loss Contingencies [Line Items] |  |  |  |  |  |
Loss contingency reserve | $ |  |  |  |  |  | $ 0
Number of lawsuits with possible material impact (one or more) | lawsuit |  |  |  |  |  | 1
Tinder Optionholder Litigation |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of plaintiffs |  |  | 6 | 6 | 10 |
Number of plaintiffs with discontinuance of their claims without prejudice |  |  |  | 4 |  |
Number of plaintiffs that were granted motion to dismiss merger-related claim for breach of contract |  |  | 2 |  |  |
Number of plaintiffs who filed a discontinuance of claims |  | 4 |  |  |  |
Number of arbitrations | arbitration | 4 |  |  |  |  |
Tinder Optionholder Litigation | Pending Litigation |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Damages sought | $ |  |  |  |  | $ 2,000,000,000 |

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