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Shareholders' Equity (Schedule Of Stockholders' Equity) (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2012
|
Jun. 30, 2011
|
Jun. 30, 2012
|
Jun. 30, 2011
|
|
| Balance | Ìý | Ìý | $ 7,039.7 | $ 3,838.7 |
| Net income | 274.3 | 427.4 | 665.7 | 850.8 |
| Other comprehensive income | (17.5) | 26.4 | 5.7 | 51.0 |
| Total comprehensive income | Ìý | Ìý | 671.4 | 901.8 |
| Equity offering | Ìý | Ìý | Ìý | 853.7 |
| Purchase of additional noncontrolling interest | Ìý | Ìý | Ìý | 0.3 |
| Stock and other incentive plans | Ìý | Ìý | 2.3 | 3.1 |
| Common stock dividends | Ìý | Ìý | (128.8) | (38.0) |
| Purchase of subsidiary shares from noncontrolling interest | Ìý | Ìý | Ìý | 4.5 |
| Undistributed gains to noncontrolling interest | Ìý | Ìý | 8.6 | 9.6 |
| Capital contribution by noncontrolling interest to subsidiary | Ìý | Ìý | 22.3 | 0.2 |
| Acquisition of controlling interest | Ìý | Ìý | (8.0) | 947.6 |
| Balance | 7,607.5 | 6,521.5 | 7,607.5 | 6,521.5 |
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Cliffs Shareholders' Equity [Member]
|
Ìý | Ìý | Ìý | Ìý |
| Balance | Ìý | Ìý | 5,785.0 | 3,845.9 |
| Net income | Ìý | Ìý | 633.8 | 832.5 |
| Other comprehensive income | Ìý | Ìý | 2.7 | 50.1 |
| Total comprehensive income | Ìý | Ìý | 636.5 | 882.6 |
| Equity offering | Ìý | Ìý | Ìý | 853.7 |
| Purchase of additional noncontrolling interest | Ìý | Ìý | Ìý | 0.3 |
| Stock and other incentive plans | Ìý | Ìý | 2.3 | 3.1 |
| Common stock dividends | Ìý | Ìý | (128.8) | (38.0) |
| Balance | 6,295.0 | 5,547.6 | 6,295.0 | 5,547.6 |
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Non-controlling Interest [Member]
|
Ìý | Ìý | Ìý | Ìý |
| Balance | Ìý | Ìý | 1,254.7 | (7.2) |
| Net income | Ìý | Ìý | 31.9 | 18.3 |
| Other comprehensive income | Ìý | Ìý | 3.0 | 0.9 |
| Total comprehensive income | Ìý | Ìý | 34.9 | 19.2 |
| Purchase of subsidiary shares from noncontrolling interest | Ìý | Ìý | Ìý | 4.5 |
| Undistributed gains to noncontrolling interest | Ìý | Ìý | 8.6 | 9.6 |
| Capital contribution by noncontrolling interest to subsidiary | Ìý | Ìý | 22.3 | 0.2 |
| Acquisition of controlling interest | Ìý | Ìý | (8.0) | 947.6 |
| Balance | $ 1,312.5 | $ 973.9 | $ 1,312.5 | $ 973.9 |
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Bloom Lake [Member]
|
Ìý | Ìý | Ìý | Ìý |
| Percentage Of Ownership Interests | 75.00% | 75.00% | 75.00% | 75.00% |
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Tilden [Member]
|
Ìý | Ìý | Ìý | Ìý |
| Percentage Of Ownership Interests | 85.00% | 85.00% | 85.00% | 85.00% |
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Empire [Member]
|
Ìý | Ìý | Ìý | Ìý |
| Percentage Of Ownership Interests | 79.00% | 79.00% | 79.00% | 79.00% |
| X | ||||||||||
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- Definition
The capital contribution by noncontrolling interest to subsidiary No definition available.
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| X | ||||||||||
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- Definition
The percentage of ownership of common stock or equity participation in the investee. No definition available.
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| X | ||||||||||
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- Definition
Noncontrolling Interest Gains that have yet to be distributed. No definition available.
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| X | ||||||||||
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- Definition
This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation". Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Equity impact of aggregate cash, stock, and paid-in-kind dividends declared for common shareholders during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Represents an increase in noncontrolling interest from issuance of additional equity interests to noncontrolling interest holders or the sale of a portion of the parent's controlling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Net of tax amount of other comprehensive income (loss) attributable to both parent entity and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cash outflow associated with the purchase of noncontrolling interest during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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