INCOME TAXES - Narrative (Details) - International - USD ($) $ in Millions	1 Months Ended	9 Months Ended
Jul. 31, 2024	Sep. 30, 2024
Income Taxes [Line Items]
Decrease in unrecognized tax benefits reasonably possible (up to)		$ 6.3
Groupon S.r.l.
Income Taxes [Line Items]
Income tax examination, estimate of possible loss	$ 33.1	$ 125.4

Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Subparagraph (d)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-15

Name:	us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant