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, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Contingency [Line Items]        
Deferred Tax Assets, Operating Loss Carryforwards $ 794.9 $ 2,118.8    
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions 113.7 102.8    
Deferred Tax Assets, Deferred Income 25.2 23.3    
Deferred Tax Assets, Property, Plant and Equipment 1.4 13.3    
Deferred Tax Assets, State Taxes 71.0 68.2    
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other 45.1 48.4    
Deferred Tax Assets, Gross 1,051.3 2,374.8    
Deferred Tax Assets, Valuation Allowance (441.3) (1,287.3) $ (1,983.1) $ (3,095.1)
Deferred Tax Assets, Net of Valuation Allowance 610.0 1,087.5    
Deferred Tax Liabilities Investment In Ventures (136.8) (141.2)    
Deferred Tax Liabilities, Intercompany Notes 0.0 (465.7)    
Deferred Tax Liabilities Other Assets (13.7) (15.8)    
Deferred Tax Liabilities, Net (150.5) (622.7)    
Deferred Tax Assets, Net $ 459.5 $ 464.8