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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) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2010
Freewest [Member]
Jan. 27, 2010
Freewest [Member]
Sep. 30, 2011
Arcelor Mittal [Member]
Jun. 30, 2011
Empire [Member]
Mar. 31, 2011
Empire [Member]
Jun. 30, 2011
Empire [Member]
Sep. 30, 2011
Empire [Member]
Dec. 31, 2002
Empire [Member]
Dec. 31, 2001
Empire [Member]
Dec. 31, 2011
CLCC [Member]
Feb. 01, 2010
Wabush [Member]
Sep. 30, 2011
Consolidated Thompson [Member]
Sep. 30, 2011
Scenario, Adjustment [Member]
Mar. 31, 2010
Scenario, Adjustment [Member]
Wabush [Member]
Dec. 31, 2010
Scenario, Adjustment [Member]
Wabush [Member]
Sep. 30, 2011
Scenario, Adjustment [Member]
Consolidated Thompson [Member]
Jun. 30, 2011
Scenario, Adjustment [Member]
Consolidated Thompson [Member]
Sep. 30, 2011
Scenario, Adjustment [Member]
Consolidated Thompson [Member]
Related Party Transaction [Line Items] 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Fair value 听 听 听 听 听 听 听 听 听 听 听 听 听 $ 27,400,000 听 听 听 听 听 听 听 听 $ 38,000,000 听 听 听 听 听 听 听
Interest Percentage 听 听 听 听 听 听 听 听 听 听 听 听 听 12.40% 听 听 听 听 听 46.70% 46.70% 听 26.80% 听 听 听 听 听 听 听
Empire's ownership percentage 听 听 听 听 听 听 听 听 听 21.00% 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Percent interest acquired 79.00% 听 听 听 听 听 听 听 听 79.00% 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Gain on acquisition of controlling interests 听 听 听 听 听 听 听 38,600,000 听 听 40,700,000 听 13,600,000 听 听 听 听 听 听 听 听 听 听 听 听 听 25,000,000 听 听 听
Retained earnings (4,424,300,000) 67,900,000 听 听 (2,924,100,000) 听 听 听 67,900,000 (4,424,300,000) (2,924,100,000) 听 听 听 听 听 听 听 听 听 听 听 听 听 听 16,100,000 听 听 听 听
Minority Interest 1,254,700,000 84,000,000 听 听 (7,200,000) 听 听 听 84,000,000 1,254,700,000 (7,200,000) 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Prior period reclassification adjustment 听 听 听 听 听 听 听 听 听 听 听 听 听 听 54,100,000 听 103,000,000 听 46,000,000 听 听 听 听 听 听 听 听 听 听 听
Reduction in earnings per share basic 听 $ 0.47 听 听 听 听 听 听 $ 0.49 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Reduction in earnings per share diluted 听 听 听 听 听 听 听 听 $ 0.48 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Goodwill, Impairment Loss 听 听 听 听 听 听 听 听 听 27,800,000 听 听 听 听 听 听 听 听 听 听 听 27,800,000 听 听 听 听 听 听 听 听
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY LOSS FROM VENTURES 听 听 听 听 听 听 听 听 16,100,000 2,241,500,000 1,303,000,000 296,500,000 听 听 听 听 听 听 听 听 听 听 听 听 听 22,000,000 听 2,000,000 500,000 2,500,000
Net income (loss) attributable to Cliffs shareholders 185,400,000 601,200,000 409,100,000 423,400,000 384,100,000 297,600,000 260,800,000 77,400,000 听 1,619,100,000 1,019,900,000 205,100,000 听 听 听 (30,400,000) (37,500,000) (67,900,000) 听 听 听 听 听 听 13,100,000 16,100,000 听 11,700,000 1,400,000 听
Decrease in basic and diluted earnings per share 听 听 听 听 听 听 听 0.12 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Increase in basic and diluted earnings per share 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 $ 0.08 听 听 听 $ 0.09 $ 0.01 $ 0.09