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FAIR VALUE MEASUREMENTS - Estimated FV (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2019 | Dec. 31, 2019 | Oct. 01, 2019 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 02, 2019 | Feb. 15, 2018 | Jul. 10, 2017 | Feb. 16, 2017
Fair value measurements |  |  |  |  |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] | Predecessor | Successor | Predecessor | Predecessor | Successor | Successor | Predecessor |  |  |  |
12.0% senior secured second lien notes due 2022 |  |  |  |  |  |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 12.00% |
6.75% senior notes due 2025 |  |  |  |  |  |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 6.75% |  |  | 6.75% | 6.75% | 6.75% | 6.75%
Principal amount |  |  |  |  |  |  |  |  |  | $ 850.0 | $ 850.0
Total |  |  |  |  |  |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] |  |  |  |  | Successor |  |  |  |  |  |

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