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REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |  |  |  |  |
Deferred revenue | $ 5.8 |  | $ 5.8 |  | $ 11.2
Amortization of deferred contract costs | 2.6 | $ 4.0 | 5.2 | $ 8.7 |
Variable consideration from unredeemed vouchers sold in prior periods | $ 10.2 |  | $ 13.0 |  |

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