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INVESTMENTS - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Available-for-sale securities |  |  |  | $ 0.0 | $ 0.0 |
Unrealized gain on investments |  |  |  | 6.4 |  |
Impairment on other equity method investments |  |  |  |  | 6.7 |
Other equity investments |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Unrealized gain on investments |  |  |  | 89.1 |  |
Percentage of other equity investment sold | 100.00% |  |  |  |  |
Proceeds from sale of equity method investments | $ 2.6 | $ 4.2 |  |  |  |
Gain on sale of equity investments | $ 2.2 |  |  |  |  |
Impairment on other equity method investments |  |  | $ 6.7 |  |  |
Monster LP |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Gain (loss) from changes in the fair value of investment |  |  |  |  |  | $ (69.4)
Equity method investments, fair value |  |  |  | 0.0 | 0.0 |
Nearbuy |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Gain (loss) from changes in the fair value of investment |  |  | $ (1.4) |  |  | (3.1)
Equity method investments, fair value |  |  |  | $ 0.0 | $ 0.0 |
SumUp Holdings |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  | 2.40% |  |
SumUp Holdings | Other equity investments |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Unrealized gain on investments |  |  |  | $ 89.1 |  | 51.4
Percentage of other equity investment sold |  |  | 50.00% |  |  |
Proceeds from sale of equity method investments |  |  | $ 34.0 |  |  |
Other Income (Expense) |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Impairments of investments |  |  |  |  |  | $ 10.0

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