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INCOME TAXES - Narrative (Details) - International - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 31, 2024 | Jun. 30, 2024 | Oct. 22, 2024 | Apr. 09, 2024
Income Taxes [Line Items] |  |  |  |
Decrease in unrecognized tax benefits reasonably possible (up to) |  | $ 5.5 |  |
Groupon S.r.l. |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax examination, estimate of possible loss |  | $ 120.4 |  |
Suspension of provisional payment, requested amount |  |  |  | $ 81.9
Appeal bond, amount due |  |  |  | $ 30.0
Groupon S.r.l. | Forecast |  |  |  |
Income Taxes [Line Items] |  |  |  |
Appeal bond, amount due |  |  | $ 51.9 |
Groupon S.r.l. | Subsequent Event |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax examination, estimate of possible loss | $ 31.5 |  |  |

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