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Annual report pursuant to Section 13 and 15(d)

QUARTERLY RESULTS OF OPERATIONS (Narrative) (Details)

v2.4.0.6
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 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Noncontrolling interest Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 21.00% Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Adjustment to record noncontrolling interest Ìý Ìý Ìý $ 84,000,000 $ 84,000,000 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Adjustment to record noncontrolling interest, increase to Income from Continuing Operations Ìý Ìý Ìý 16,100,000 16,100,000 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Adjustment to record noncontrolling interest, decrease to Net Income Attributable to Cliffs Shareholders Ìý Ìý Ìý 67,900,000 67,900,000 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Error Correction to Earnings Per Share Basic Ìý Ìý Ìý $ (0.47) $ (0.49) Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Error Correction To Earnings Per Share, Diluted Ìý Ìý Ìý $ (0.47) $ (0.48) Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Adjustment to record noncontrolling interest, decrease in Retained Earnings Ìý Ìý Ìý Ìý Ìý 67,900,000 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Adjustment to record noncontrolling interest, increase in Noncontrolling Interest Ìý Ìý Ìý Ìý Ìý 84,000,000 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Reclassification of amounts to Product revenues Ìý Ìý Ìý 46,000,000 Ìý 46,000,000 54,100,000 54,100,000 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Discontinued Operations Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Ownership Interest Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 79.00% Ìý 45.00% Ìý Ìý Ìý 73.20% Ìý Ìý
Proceeds from sale of economic interest Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 141,000,000 Ìý Ìý Ìý Ìý Ìý Ìý
Goodwill impairment 1,000,000,000 27,800,000 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 997,300,000 2,700,000 2,700,000 Ìý Ìý Ìý
Impairment of goodwill and other long-lived assets 1,049,900,000 27,800,000 0 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 49,900,000 Ìý Ìý Ìý Ìý
Income tax expense $ 255,900,000 $ 407,700,000 $ 282,500,000 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý $ 314,700,000 $ 226,400,000