Annual report pursuant to Section 13 and 15(d)

INCOME TAXES INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details)

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INCOME TAXES INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Income Tax Contingency [Line Items]    
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions $ 88.4 $ 161.2
Deferred Tax Assets, MMRT Starting Base Allowance 300.3 357.1
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits 58.0 87.7
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax 299.2 274.9
Deferred Tax Assets Development Costs 0 14.1
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Asset Retirement Obligations 61.7 48.2
Deferred Tax Assets, Operating Loss Carryforwards 524.4 396.4
Deferred Tax Assets, Inventory 16.4 45.4
Deferred Tax Assets, Property, Plant and Equipment 56.0 49.2
Deferred Tax Assets Leasing Arrangements 31.9 31.0
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other 138.3 140.9
Deferred Tax Assets, Gross 1,574.6 1,606.1
Deferred Tax Assets, Valuation Allowance 864.1 858.4
Deferred Tax Assets, Net of Valuation Allowance 710.5 747.7
Deferred Tax Liabilities, Property, Plant and Equipment 1,400.8 1,350.5
Deferred Tax Liabilities Investment In Ventures 196.4 207.6
Deferred Tax Liabilities, Intangible Assets 33.5 24.6
Deferred Tax Liabilities Income Tax Uncertainties 48.5 48.5
Deferred Tax Liabilities, Derivatives 0 1.6
Deferred Tax Liabilities, Tax Deferred Income 12.8 19.6
Deferred Tax Liabilities Other Assets 93.0 101.9
Deferred Tax Liabilities, Net 1,785.0 1,754.3
Deferred Tax Assets, Net $ (1,074.5) $ (1,006.6)