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SHAREHOLDERS' EQUITY - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
vote
shares
Mar. 09, 2020
shares
Dec. 31, 2019
shares
Feb. 06, 2019
shares
Class of Stock [Line Items]        
Stock authorized for repurchase (shares)   20,000,000   15,000,000
Stock repurchased during period (shares) 8,400,000      
Shares repurchased during period, value | $ $ 62.6      
Remaining stock authorized for repurchase (shares) 19,300,000      
Class A Common Stock        
Class of Stock [Line Items]        
Votes per each share of stock | vote 1      
Common stock outstanding (shares) 78,333,000   79,681,000  
Common stock reserved (shares) 40,200,000      
Class B Convertible Common Stock        
Class of Stock [Line Items]        
Votes per each share of stock | vote 10      
Common stock outstanding (shares) 421,862,000   421,570,000  
Class C Common Stock        
Class of Stock [Line Items]        
Common stock outstanding (shares) 0   0  
Delaware | Class C Common Stock        
Class of Stock [Line Items]        
Fractional votes for each share of common stock | vote 0.01      
IAC | Class B Convertible Common Stock        
Class of Stock [Line Items]        
Common stock outstanding (shares) 421,900,000      
ANGI Homeservices | IAC | Class B Convertible Common Stock        
Class of Stock [Line Items]        
Ownership interest (as a percent) 84.30%      
Voting interest (as a percent) 98.20%      
Minimum proportion of non-voting capital stock that parent is enabled to maintain upon issuance of new stock (as a percent) 80.10%