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SHAREHOLDERS' EQUITY Stock-Based Employee Compensation, Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Oct. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock granted, options (in shares) |  | 1,458,680 |  | 1,458,680 |
Share-based compensation expense (benefit) |  | $ 1.3 | $ 0.3 | $ 0.1 | $ 2.1
CEO |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense (benefit) |  |  |  | $ (2.4) |
Restricted stock units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock granted (in shares) |  | 597,888 |  | 844,522 |
Restricted stock units | CEO |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period | 1 year |  |  |  |
Stock granted (in shares) | 400,000 |  |  |  |
Restricted stock units | Tranche 1 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  |  | 3 years |
Vesting percentage |  |  |  | 33.33% |
Restricted stock units | Tranche 2 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  |  | 1 year |
Vesting percentage |  |  |  | 33.33% |
Restricted stock units | Tranche 3 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  |  | 3 years |
Vesting percentage |  |  |  | 33.33% |
Restricted stock units | Tranche 4 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  |  | 5 years |
Performance-based restricted stock units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  |  | 3 years |
Stock granted (in shares) |  | 0 |  | 62,290 |
Threshold trading days |  |  |  | 50 days |
Performance-based restricted stock units | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  |  |  | 200.00% |
Stock Options | CEO |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  |  | 4 years |
Service-based vesting |  |  |  | 4 years |
Matching Stock Options | CEO |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  |  | 4 years |
Stock granted, options (in shares) |  |  |  | 400,000 |

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