CONTINGENCIES - Narrative (Details)				1 Months Ended
	Jun. 13, 2019 plaintiff	Aug. 31, 2018 plaintiff	Aug. 14, 2018 USD ($) plaintiff	Nov. 30, 2018 USD ($)	Sep. 30, 2020 USD ($) lawsuit
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 | plaintiff	6	6	10
Number of plaintiffs with discontinuance of their claims without prejudice | plaintiff		4
Number of plaintiffs that were granted motion to dismiss merger-related claim for breach of contract | plaintiff	2
Tinder Optionholder Litigation | Pending Litigation
Loss Contingencies [Line Items]
Damages sought | $			$ 2,000,000,000
FTC Investigation of Business Practices | Pending Litigation
Loss Contingencies [Line Items]
Damages sought | $				$ 60,000,000