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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% |  |  |

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