Annual report pursuant to Section 13 and 15(d)

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

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INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Income Tax Contingency [Line Items]    
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions $ 76.3 $ 114.6
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits 25.6 35.2
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax 0.0 251.2
Deferred Tax Assets, Deferred Income 24.2 44.5
Deferred Tax Assets, Goodwill and Intangible Assets 12.2 0.0
Deferred Tax Assets, Amortization 0.0 71.3
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Asset Retirement Obligations 9.9 22.3
Deferred Tax Assets, Operating Loss Carryforwards 2,368.1 2,699.7
Deferred Tax Assets, Property, Plant and Equipment 188.2 181.2
Deferred Tax Assets, State Taxes 74.2 59.2
Deferred Tax Assets Leasing Arrangements 9.6 12.9
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other 100.4 108.3
Deferred Tax Assets, Gross 2,888.7 3,600.4
Deferred Tax Assets, Valuation Allowance (2,238.5) (3,334.8)
Deferred Tax Assets, Net of Valuation Allowance 650.2 265.6
Deferred Tax Liabilities, Property, Plant and Equipment (1.5) (34.0)
Deferred Tax Liabilities Investment In Ventures (137.5) (203.1)
Deferred Tax Liabilities, Intangible Assets 0.0 (1.0)
Deferred Tax Liabilities, Tax Deferred Income (3.8) (3.4)
Deferred Tax Liabilities, Intercompany Notes 465.7 0.0
Deferred Tax Liabilities Other Assets (41.7) (24.1)
Deferred Tax Liabilities, Net (650.2) (265.6)
Deferred Tax Assets, Net $ 0.0 $ 0.0