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INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Income Tax Contingency [Line Items] |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards | $ 794.9 | $ 2,118.8 |  |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions | 113.7 | 102.8 |  |
Deferred Tax Assets, Deferred Income | 25.2 | 23.3 |  |
Deferred Tax Assets, Property, Plant and Equipment | 1.4 | 13.3 |  |
Deferred Tax Assets, State Taxes | 71.0 | 68.2 |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other | 45.1 | 48.4 |  |
Deferred Tax Assets, Gross | 1,051.3 | 2,374.8 |  |
Deferred Tax Assets, Valuation Allowance | (441.3) | (1,287.3) | $ (1,983.1) | $ (3,095.1)
Deferred Tax Assets, Net of Valuation Allowance | 610.0 | 1,087.5 |  |
Deferred Tax Liabilities Investment In Ventures | (136.8) | (141.2) |  |
Deferred Tax Liabilities, Intercompany Notes | 0.0 | (465.7) |  |
Deferred Tax Liabilities Other Assets | (13.7) | (15.8) |  |
Deferred Tax Liabilities, Net | (150.5) | (622.7) |  |
Deferred Tax Assets, Net | $ 459.5 | $ 464.8 |  |

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