Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE OF FINANCIAL INSTRUMENTS FAIR VALUE OF FINANCIAL INSTRUMENTS (Impairment Charges on Financial and Nonfinancial Assets) (Details)

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3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Goodwill, Impairment Loss $ 0 $ 80.9
ASSETS:    
Assets, Fair Value Disclosure, Nonrecurring   47.9
Impairment Charges   318.4
Fair Value, Inputs, Level 1 [Member]
   
ASSETS:    
Assets, Fair Value Disclosure, Nonrecurring   0
Fair Value, Inputs, Level 2 [Member]
   
ASSETS:    
Assets, Fair Value Disclosure, Nonrecurring   0
Fair Value, Inputs, Level 3 [Member]
   
ASSETS:    
Assets, Fair Value Disclosure, Nonrecurring   47.9
Amapa [Member]
   
ASSETS:    
Equity Method Investments, Fair Value Disclosure   0
Equity Method Investment, Other than Temporary Impairment   67.6
Amapa [Member] | Fair Value, Inputs, Level 1 [Member]
   
ASSETS:    
Equity Method Investments, Fair Value Disclosure   0
Amapa [Member] | Fair Value, Inputs, Level 2 [Member]
   
ASSETS:    
Equity Method Investments, Fair Value Disclosure   0
Amapa [Member] | Fair Value, Inputs, Level 3 [Member]
   
ASSETS:    
Equity Method Investments, Fair Value Disclosure   0
Cliffs Chromite Ontario and Cliffs Chromite Far North [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Goodwill, Fair Value Disclosure   0
Goodwill, Impairment Loss   80.9
Cliffs Chromite Ontario and Cliffs Chromite Far North [Member] | Fair Value, Inputs, Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Goodwill, Fair Value Disclosure   0
Cliffs Chromite Ontario and Cliffs Chromite Far North [Member] | Fair Value, Inputs, Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Goodwill, Fair Value Disclosure   0
Cliffs Chromite Ontario and Cliffs Chromite Far North [Member] | Fair Value, Inputs, Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Goodwill, Fair Value Disclosure   0
Wabush and Cliffs Chromite Ontario and Cliffs Chromite Far North [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Property, Plant, and Equipment, Fair Value Disclosure   46.3
Impairment of Long-Lived Assets Held-for-use   155.4
Wabush and Cliffs Chromite Ontario and Cliffs Chromite Far North [Member] | Fair Value, Inputs, Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Property, Plant, and Equipment, Fair Value Disclosure   0
Wabush and Cliffs Chromite Ontario and Cliffs Chromite Far North [Member] | Fair Value, Inputs, Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Property, Plant, and Equipment, Fair Value Disclosure   0
Wabush and Cliffs Chromite Ontario and Cliffs Chromite Far North [Member] | Fair Value, Inputs, Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Property, Plant, and Equipment, Fair Value Disclosure   46.3
Wabush [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Finite-lived Intangible Assets, Fair Value Disclosure   1.6
Other Asset Impairment Charges   14.5
Wabush [Member] | Fair Value, Inputs, Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Finite-lived Intangible Assets, Fair Value Disclosure   0
Wabush [Member] | Fair Value, Inputs, Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Finite-lived Intangible Assets, Fair Value Disclosure   0
Wabush [Member] | Fair Value, Inputs, Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Finite-lived Intangible Assets, Fair Value Disclosure   $ 1.6