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Quarterly Results Of Operations (Schedule Of Error Corrections And Prior Period Adjustments) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | ||||||||||
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Dec. 31, 2011
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Sep. 30, 2011
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Jun. 30, 2011
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Mar. 31, 2011
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Dec. 31, 2010
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Sep. 30, 2010
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Jun. 30, 2010
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Mar. 31, 2010
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Jun. 30, 2011
Empire [Member]
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Mar. 31, 2011
Empire [Member]
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Jun. 30, 2011
Empire [Member]
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| Related Party Transaction [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Product | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | $ 6,551.7 | $ 4,416.8 | $ 2,216.2 | $ 46.0 | $ 54.1 | $ 100.1 |
| Freight and venture partners' cost reimbursements | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | 242.6 | 265.3 | 125.8 | (46.0) | Ìý | (46.0) |
| Revenues from product sales and services | 1,662.5 | 2,142.8 | 1,805.8 | 1,183.2 | 1,424.1 | 1,346.0 | 1,184.3 | 727.7 | 6,794.3 | 4,682.1 | 2,342.0 | Ìý | 54.1 | 54.1 |
| Cost of Goods Sold and Operating Expenses | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | 4,105.7 | 3,155.6 | 2,030.3 | Ìý | (54.1) | (54.1) |
| Income from Continuing Operations | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | 2,348.6 | 1,270.2 | 236.1 | 7.7 | 8.4 | 16.1 |
| LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | 193.5 | Ìý | Ìý | 38.1 | 45.9 | 84.0 |
| Net Income Attributable to Cliffs Shareholders | $ 185.4 | $ 601.2 | $ 409.1 | $ 423.4 | $ 384.1 | $ 297.6 | $ 260.8 | $ 77.4 | $ 1,619.1 | $ 1,019.9 | $ 205.1 | $ (30.4) | $ (37.5) | $ (67.9) |
| Earnings Per Share [Abstract] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Earnings Per Share, Basic and Diluted | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | $ (0.22) | $ (0.28) | $ (0.49) |
| X | ||||||||||
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- Definition
Repayment received for expenses incurred on behalf of the client or customer and revenue from transporting freight between locations. No definition available.
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- Definition
The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. No definition available.
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- Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The portion of net Income or Loss attributable to the noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The net result for the period of deducting operating expenses from operating revenues. No definition available.
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- Details
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- Definition
Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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