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INCOME TAXES - Narrative (Details) - International € in Millions, $ in Millions			1 Months Ended		12 Months Ended
	Aug. 05, 2025 USD ($)	Aug. 05, 2025 EUR (€)	Jul. 31, 2024 USD ($)	Jul. 31, 2024 EUR (€)	Dec. 31, 2012 USD ($)	Dec. 31, 2012 EUR (€)	Aug. 06, 2025 USD ($)	Aug. 06, 2025 EUR (€)	Aug. 05, 2025 EUR (€)	Jun. 30, 2025 USD ($)
Operating Loss Carryforwards [Line Items]
Decrease in unrecognized tax benefits reasonably possible (up to)										$ 2.7
Groupon S.r.l. | Italy 2012 Assessment
Operating Loss Carryforwards [Line Items]
Income tax examination, estimate of possible loss					$ 134.4	€ 114.7
Provisional payments term					72 months	72 months
Groupon S.r.l. | Italy 2017 Assessment
Operating Loss Carryforwards [Line Items]
Income tax examination, estimate of possible loss			$ 35.1	€ 29.9
Groupon S.r.l. | Subsequent Event
Operating Loss Carryforwards [Line Items]
Income tax examination, estimate of possible loss	$ 24.9	€ 21.3
Income tax examination, estimate of possible loss, net of previous installment payments	14.9	12.7
Groupon S.r.l. | Subsequent Event | Italy 2012 Assessment
Operating Loss Carryforwards [Line Items]
Income tax examination, estimate of possible loss	20.1	17.2
Income tax examination, liability (refund) adjustment from settlement with taxing authority	10.1								€ 8.6
Income tax examination, provisional payments							$ 10.4	€ 8.9
Groupon S.r.l. | Subsequent Event | Italy 2017 Assessment
Operating Loss Carryforwards [Line Items]
Income tax examination, estimate of possible loss	$ 4.8	€ 4.1

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Estimated amount of loss resulting from an adverse tax position.

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