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FINANCIAL INSTRUMENTS - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Feb. 15, 2019
USD ($)
Dec. 31, 2018
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Unrealized (loss) gain on marketable equity security $ (4,600,000)     $ 25,300,000      
Gross realized gains 0   $ 0 0 $ 0    
Gross realized losses 0   $ 0 0 $ 0    
Assets measured at fair value on a nonrecurring basis              
Equity securities without readily determinable fair values 334,000,000.0     334,000,000.0     $ 235,100,000
Total upward adjustments to equity securities without readily determinable fair value 300,000     300,000      
Total downward adjustments to equity securities without readily determinable fair value 3,000,000.0     3,000,000.0      
Contingent Consideration Arrangements              
Total maximum contingent payment 45,000,000.0     45,000,000.0      
Gross fair value, before unamortized discount 22,300,000     22,300,000      
Payment to settle contingent consideration arrangement   $ 2,000,000.0          
Current portion 2,000,000.0     2,000,000.0     2,000,000.0
Non-current portion 11,700,000     11,700,000     26,600,000
Match Group              
Contingent Consideration Arrangements              
Aggregate principal amount 1,625,000,000     1,625,000,000     1,535,000,000
Match Group | Credit Facility | MTCH Credit Facility              
Contingent Consideration Arrangements              
Face amount of debt instrument             500,000,000
Aggregate principal amount 0     0     260,000,000
Match Group | Senior Notes | 5.625% MTCH Senior Notes              
Contingent Consideration Arrangements              
Aggregate principal amount $ 350,000,000     $ 350,000,000   $ 350,000,000 $ 0
Stated interest rate (as a percent) 5.625%     5.625%   5.625%  
Measurement Input, Discount Rate | Contingent Consideration Arrangements              
Contingent Consideration Arrangements              
Contingent consideration, discount rate 0.25     0.25      
Minimum | Measurement Input, Discount Rate | Contingent Consideration Arrangements              
Contingent Consideration Arrangements              
Contingent consideration, discount rate             0.12
Maximum | Measurement Input, Discount Rate | Contingent Consideration Arrangements              
Contingent Consideration Arrangements              
Contingent consideration, discount rate             0.25
Turo              
Contingent Consideration Arrangements              
Equity method investments $ 250,000,000     $ 250,000,000