Cleveland-Cliffs Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Cover
- Document and Entity Information
Financial Statements
Notes to Financial Statements
Accounting Policies
- BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Policies)
Notes Tables
Notes Details

Basis Of Presentation And Significant Accounting Policies (Narrative) (Detail)

v2.4.0.6

Basis Of Presentation And Significant Accounting Policies (Narrative) (Detail)	3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended					9 Months Ended
	Sep. 30, 2011 Renewafuel [Member] USD ($)	Sep. 30, 2012 Renewafuel [Member] USD ($)	Sep. 30, 2011 Renewafuel [Member] USD ($)	Sep. 30, 2011 Arcelor Mittal [Member] USD ($)	Sep. 30, 2011 Arcelor Mittal [Member] USD ($)	Sep. 30, 2011 Empire [Member] USD ($)	Sep. 30, 2011 Empire [Member] USD ($)	Sep. 30, 2012 Empire [Member]	Sep. 30, 2011 Empire [Member]	Sep. 30, 2012 Black Label And Black Thor Chromite Deposits [Member]	Sep. 30, 2012 Big Daddy Chromite Deposit [Member]	Sep. 30, 2012 Asia Pacific Iron Ore [Member] Cockatoo [Member] USD ($)	Sep. 30, 2012 Asia Pacific Iron Ore [Member] Cockatoo [Member] AUD	Sep. 30, 2012 Asia Pacific Coal [Member] Sonoma [Member] AUD
Related Party Transaction [Line Items]
Asset Impairment Charges	$ 16,700,000		$ 16,700,000
Error Correction to Retained earnings						0	0
Ownership interest, percent								79.00%	79.00%	100.00%	70.00%			45.00%
Proceeds from Divestiture of Interest in Joint Venture													4.00	141,000,000
Error Correction to income (loss) from continuing operations including portion attributable to noncontrolling interest						16,100,000	16,100,000
Error Correction to net income (loss)						67,900,000	67,900,000
Noncontrolling interest									21.00%
Error Correction to Net Income (Loss) Attributable to Noncontrolling Interest						84,000,000	84,000,000
Error Correction to Earnings Per Share, Basic						0.47	0.49
Error Correction To Earnings Per Share, Diluted						0.47	0.48
Income (loss) from discontinued operations	17,500,000	100,000	18,700,000
Error Correction to Stockholders' Equity Attributable to Noncontrolling Interest						84,000,000	84,000,000
Error correction to Sales revenue, net				54,100,000	54,100,000	46,000,000	46,000,000
Estimated Rehabilitation Costs												$ 24,000,000

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Error correction to total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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