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INCOME TAXES INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Income Tax Contingency [Line Items] |  |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions | $ 114.6 | $ 106.6
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits | 35.2 | 36.5
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 251.2 | 218.7
Deferred Tax Assets, Deferred Income | 44.5 | 57.2
Deferred Tax Assets, Amortization | 71.3 | 0.0
Deferred Tax Assets Development Costs | 0.0 | 4.9
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Asset Retirement Obligations | 22.3 | 5.3
Deferred Tax Assets, Operating Loss Carryforwards | 2,699.7 | 2,791.6
Deferred Tax Assets, Property, Plant and Equipment | 181.2 | 189.8
Deferred Tax Assets, State Taxes | 59.2 | 59.9
Deferred Tax Assets Leasing Arrangements | 12.9 | 18.3
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other | 108.3 | 148.9
Deferred Tax Assets, Gross | 3,600.4 | 3,637.7
Deferred Tax Assets, Valuation Allowance | (3,334.8) | (3,372.5)
Deferred Tax Assets, Net of Valuation Allowance | 265.6 | 265.2
Deferred Tax Liabilities, Property, Plant and Equipment | (34.0) | (35.5)
Deferred Tax Liabilities Investment In Ventures | (203.1) | (206.6)
Deferred Tax Liabilities, Intangible Assets | (1.0) | (1.5)
Deferred Tax Liabilities, Tax Deferred Income | (3.4) | (2.5)
Deferred Tax Liabilities Other Assets | (24.1) | (19.1)
Deferred Tax Liabilities, Net | (265.6) | (265.2)
Deferred Tax Assets, Net | $ 0.0 | $ 0.0

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