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

Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity (Changes In The Components Of Accumulated Other Comprehensive Income (Loss)) (Detail)

Shareholders' Equity (Changes In The Components Of Accumulated Other Comprehensive Income (Loss)) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended												9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Postretirement Benefit Liability [Member]	Sep. 30, 2011 Postretirement Benefit Liability [Member]	Sep. 30, 2012 Accumulated Net Unrealized Investment Gain (Loss) On Securities [Member]	Sep. 30, 2011 Accumulated Net Unrealized Investment Gain (Loss) On Securities [Member]	Sep. 30, 2012 Accumulated Translation Adjustment [Member]	Sep. 30, 2011 Accumulated Translation Adjustment [Member]	Sep. 30, 2012 Foreign Currency Translation Adjustment [Member]	Dec. 31, 2011 Foreign Currency Translation Adjustment [Member]	Sep. 30, 2011 Foreign Currency Translation Adjustment [Member]	Dec. 31, 2010 Foreign Currency Translation Adjustment [Member]	Sep. 30, 2012 Unrealized Gain (Loss) On Derivatives [Member]	Sep. 30, 2011 Unrealized Gain (Loss) On Derivatives [Member]	Sep. 30, 2012 Accumulated Other Comprehensive Income (Loss) [Member]	Sep. 30, 2011 Accumulated Other Comprehensive Income (Loss) [Member]
Changes in Accumulated Other Comprehensive Loss [Roll Forward]
Balance			$ (92.6)		$ (408.9)	$ (305.1)	$ 2.6	$ 33.6			$ 324.7	$ 312.5	$ 239.9	$ 314.7	$ 1.2	$ 2.7	$ (92.6)	$ 45.9
Change	40.3	(155.6)	46.1	(104.7)	16.4	13.9											41.6	(105.2)
Unrealized net gain (loss) on derivative financial instruments	14.2	(16.7)	13.6	(13.5)											13.6	(13.5)
Unrealized net gain (loss) on foreign currency translation	18.6	(132.2)	12.2	(74.8)					12.2	(74.8)
Unrealized net loss on marketable securities	(0.1)	(11.6)	(0.6)	(30.8)			(0.6)	(30.8)
Balance	$ (51.0)		$ (51.0)		$ (392.5)	$ (291.2)	$ 2.0	$ 2.8			$ 324.7	$ 312.5	$ 239.9	$ 314.7	$ 14.8	$ (10.8)	$ (51.0)	$ (59.3)

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 14, 17, 26

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14A

-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-Article 5

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 15D

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

Net of tax and reclassification adjustments of the change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity. Also includes the following: gain (loss) on foreign currency forward exchange contracts; foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; and gain (loss) on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain (loss) that has been designated and qualified as a hedging instrument for hedging of the foreign currency exposure of a net investment in a foreign operation.

+ References + Details