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
Dec. 31, 2016
Dec. 31, 2015
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