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SHARE-BASED COMPENSATION - Narrative (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total share-based compensation expense | $ 4.9 | $ 0.5 | $ 7.2 | $ 26.2
Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total share-based compensation expense | 0.7 | 0.5 | 2.4 | 26.2
Unrecognized compensation cost | 7.4 |  | 7.4 |
Restricted stock unit expense |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total share-based compensation expense | 4.2 | $ 0.0 | 4.8 | $ 0.0
Unrecognized compensation cost | $ 66.1 |  | $ 66.1 |
Unrecognized compensation cost, period of recognition |  |  | 4 years |
Stock option expense |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost, period of recognition |  |  | 6 years |
Tender offer | Common stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total share-based compensation expense |  |  | $ 25.1 |
2020 Equity Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares available for issuance (in shares) | 24.7 |  | 24.7 |

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