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INCOME TAXES - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended
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May 01, 2019 | Jun. 30, 2019 | Jun. 30, 2020 | May 01, 2019 | Jun. 30, 2020
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective tax rates (as a percent) | 1.10% | 29.20% | 18.10% | 0.40% | 9.30%
Deferred tax benefit on impairment charge |  |  |  |  | $ 125.5
Income tax benefits for reorganization adjustments | $ 102.9 |  |  |  |
Fresh start adjustments, income tax expense | 185.4 |  |  |  |
Income tax expense (benefit), deferred tax liabilities | 529.1 |  |  |  |
Income tax expense (benefit), deferred tax assets | $ 343.7 |  |  |  |
COVID-19, employment tax, employer, deferral, CARES Act |  |  | $ 11.3 |  | 11.3
COVID-19, employee retention credit, CARES Act |  |  | $ 0.7 |  | $ 0.7

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