Basis Of Presentation And Significant Accounting Policies (Impact Of The Prospective Adjustments On The Statements Of Unaudited Condensed Consolidated Operations ) (Details) (USD $) In Millions, except Per Share data |
3 Months Ended | 9 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | ||||
|---|---|---|---|---|---|---|---|---|---|
Sep. 30, 2011 |
Sep. 30, 2010 |
Sep. 30, 2011 |
Sep. 30, 2010 |
Sep. 30, 2011
Immaterial Error [Member]
|
Jun. 30, 2011
Immaterial Error [Member]
|
Mar. 31, 2011
Immaterial Error [Member]
|
Jun. 30, 2011
Immaterial Error [Member]
|
Sep. 30, 2011
Immaterial Error [Member]
|
|
| Product | $ 2,124.4 | $ 1,287.2 | $ 4,962.4 | $ 3,074.8 | $ 54.1 | $ 46.0 | $ 54.1 | $ 100.1 | $ 54.1 |
| Freight and venture partners' cost reimbursements | 18.4 | 58.8 | 169.4 | 183.1 | (46.0) | (46.0) | Ìý | (46.0) | (46.0) |
| TOTAL REVENUES | 2,142.8 | 1,346.0 | 5,131.8 | 3,257.9 | Ìý | Ìý | 54.1 | 54.1 | Ìý |
| Cost of Goods Sold and Operating Expenses | 1,279.5 | 868.8 | 2,936.9 | 2,215.3 | Ìý | Ìý | (54.1) | (54.1) | Ìý |
| Income from Continuing Operations | 758.8 | 298.1 | 1,609.4 | 637.4 | 16.1 | 7.7 | 8.4 | 16.1 | 16.1 |
| LESS: INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST | 151.8 | Ìý | 170.1 | Ìý | Ìý | 38.1 | 45.9 | 84.0 | 84.0 |
| NET INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | $ 589.5 | $ 297.4 | $ 1,420.6 | $ 635.4 | $ 67.9 | $ (30.4) | $ (37.5) | $ (67.9) | $ 67.9 |
| Earnings per Common Share Attributable to Cliffs Shareholders - Basic and Diluted | Ìý | Ìý | Ìý | Ìý | $ 0.47 | $ (0.22) | $ (0.28) | $ (0.49) | Ìý |
| X | ||||||||||
- Definition Repayment received for expenses incurred on behalf of the client or customer and revenue from transporting freight between locations.
|
| X | ||||||||||
- 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
|
| X | ||||||||||
- 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.
|
| X | ||||||||||
- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- 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
|
| X | ||||||||||
- 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
|
| X | ||||||||||
- 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
|
| X | ||||||||||
- 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
|