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INCOME TAXES INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Income Tax Contingency [Line Items] |  |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions | $ 106.6 | $ 99.5
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits | 36.5 | 50.4
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 218.7 | 219.1
Deferred Tax Assets Development Costs | 4.9 | 0.0
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Asset Retirement Obligations | 5.3 | 29.4
Deferred Tax Assets, Operating Loss Carryforwards | 2,791.6 | 679.0
Deferred Tax Assets, Inventory | 57.2 | 25.6
Deferred Tax Assets, Property, Plant and Equipment | 189.8 | 337.8
Deferred Tax Assets, State Taxes | 59.9 | 41.9
Deferred Tax Assets Leasing Arrangements | 18.3 | 14.1
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other | 148.9 | 95.6
Deferred Tax Assets, Gross | 3,637.7 | 1,592.4
Deferred Tax Assets, Valuation Allowance | (3,372.5) | (1,152.3)
Deferred Tax Assets, Net of Valuation Allowance | 265.2 | 440.1
Deferred Tax Liabilities, Property, Plant and Equipment | (35.5) | 0.0
Deferred Tax Liabilities Investment In Ventures | (206.6) | (198.0)
Deferred Tax Liabilities, Intangible Assets | (1.5) | (7.3)
Deferred Tax Liabilities, Tax Deferred Income | (2.5) | (3.1)
Deferred Tax Liabilities Other Assets | (19.1) | (65.9)
Deferred Tax Liabilities, Net | (265.2) | (274.3)
Deferred Tax Assets, Net | $ 0.0 | $ 165.8

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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