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Annual report pursuant to Section 13 and 15(d)

QUARTERLY RESULTS OF OPERATIONS (Narrative) (Details)

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QUARTERLY RESULTS OF OPERATIONS (Narrative) (Details)
 12 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Sep. 30, 2011
Empire [Member]
USD ($)
Sep. 30, 2011
Empire [Member]
USD ($)
Dec. 31, 2011
Empire [Member]
USD ($)
Sep. 30, 2011
Arcelor Mittal [Member]
USD ($)
Dec. 31, 2011
Arcelor Mittal [Member]
USD ($)
Dec. 31, 2012
Empire [Member]
Sep. 30, 2011
Empire [Member]
Dec. 31, 2012
Sonoma [Member]
Asia Pacific Coal [Member]
AUD
Dec. 31, 2012
Bloom Lake [Member]
USD ($)
Dec. 31, 2012
Wabush [Member]
USD ($)
Dec. 31, 2012
Wabush [Member]
USD ($)
Feb. 28, 2010
Wabush [Member]
Dec. 31, 2012
MRRT Starting Base Deferred Tax Asset, Unrealizable [Member]
USD ($)
Dec. 31, 2012
Deferred Tax Asset, Alternative Minimum Tax Credit Not Utilized [Member]
USD ($)
Immaterial Errors 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Noncontrolling interest 听 听 听 听 听 听 听 听 听 21.00% 听 听 听 听 听 听 听
Adjustment to record noncontrolling interest 听 听 听 $ 84,000,000 $ 84,000,000 听 听 听 听 听 听 听 听 听 听 听 听
Adjustment to record noncontrolling interest, increase to Income from Continuing Operations 听 听 听 16,100,000 16,100,000 听 听 听 听 听 听 听 听 听 听 听 听
Adjustment to record noncontrolling interest, decrease to Net Income Attributable to Cliffs Shareholders 听 听 听 67,900,000 67,900,000 听 听 听 听 听 听 听 听 听 听 听 听
Error Correction to Earnings Per Share Basic 听 听 听 $ (0.47) $ (0.49) 听 听 听 听 听 听 听 听 听 听 听 听
Error Correction To Earnings Per Share, Diluted 听 听 听 $ (0.47) $ (0.48) 听 听 听 听 听 听 听 听 听 听 听 听
Adjustment to record noncontrolling interest, decrease in Retained Earnings 听 听 听 听 听 67,900,000 听 听 听 听 听 听 听 听 听 听 听
Adjustment to record noncontrolling interest, increase in Noncontrolling Interest 听 听 听 听 听 84,000,000 听 听 听 听 听 听 听 听 听 听 听
Reclassification of amounts to Product revenues 听 听 听 46,000,000 听 46,000,000 54,100,000 54,100,000 听 听 听 听 听 听 听 听 听
Discontinued Operations 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Ownership Interest 听 听 听 听 听 听 听 听 79.00% 听 45.00% 听 听 听 73.20% 听 听
Proceeds from sale of economic interest 听 听 听 听 听 听 听 听 听 听 141,000,000 听 听 听 听 听 听
Goodwill impairment 1,000,000,000 27,800,000 听 听 听 听 听 听 听 听 听 997,300,000 2,700,000 2,700,000 听 听 听
Impairment of goodwill and other long-lived assets 1,049,900,000 27,800,000 0 听 听 听 听 听 听 听 听 听 49,900,000 听 听 听 听
Income tax expense $ 255,900,000 $ 407,700,000 $ 282,500,000 听 听 听 听 听 听 听 听 听 听 听 听 $ 314,700,000 $ 226,400,000