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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Fair Value Disclosures [Abstract] |  |
Fair Value Of Assets And Liabilities | The following represents the assets and liabilities of the Company measured at fair value at December 31, 2014 and 2013:
| (In Millions)
| December 31, 2014
Description | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total
Assets: |  |  |  |  |  |  |
Derivative assets | — |  |  | — |  |  | 63.2 |  |  | 63.2 |
Available-for-sale marketable securities | 4.3 |  |  | — |  |  | — |  |  | 4.3 |
Total | $ | 4.3 |  |  | $ | — |  |  | $ | 63.2 |  |  | $ | 67.5 |
Liabilities: |  |  |  |  |  |  |
Derivative liabilities | $ | — |  |  | $ | — |  |  | $ | 11.8 |  |  | $ | 11.8 |
Foreign exchange contracts | — |  |  | 31.5 |  |  | — |  |  | 31.5 |
Total | $ | — |  |  | $ | 31.5 |  |  | $ | 11.8 |  |  | $ | 43.3 |
| (In Millions)
| December 31, 2013
Description | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total
Assets: |  |  |  |  |  |  |
Cash equivalents | $ | 85.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 85.0 |
Derivative assets | — |  |  | — |  |  | 58.9 |  |  | 58.9 |
Available-for-sale marketable securities | 21.4 |  |  | — |  |  | — |  |  | 21.4 |
Foreign exchange contracts | — |  |  | 0.3 |  |  | — |  |  | 0.3 |
Total | $ | 106.4 |  |  | $ | 0.3 |  |  | $ | 58.9 |  |  | $ | 165.6 |
Liabilities: |  |  |  |  |  |  |
Derivative liabilities | $ | — |  |  | $ | 2.1 |  |  | $ | 10.3 |  |  | $ | 12.4 |
Foreign exchange contracts | — |  |  | 26.9 |  |  | — |  |  | 26.9 |
Total | $ | — |  |  | $ | 29.0 |  |  | $ | 10.3 |  |  | $ | 39.3 |
Fair Value, Recurring and Nonrecurring, Valuation Techniques | The following table illustrates information about quantitative inputs and assumptions for the derivative assets and derivative liabilities categorized in Level 3 of the fair value hierarchy:
Qualitative/Quantitative Information About Level 3 Fair Value Measurements
($ in millions) |  | Fair Value at |  | Balance Sheet Location |  | Valuation Technique |  | Unobservable Input |  | Range or Point Estimate (Weighted Average)
| 12/31/2014
Provisional Pricing Arrangements |  | $ | 11.8 |  |  | Other current liabilities |  | Market Approach |  | Management's Estimate of 62% Fe |  | $72
Customer Supply Agreement |  | $ | 63.2 |  |  | Other current assets |  | Market Approach |  | Hot-Rolled Steel Estimate |  | $590 - $640 ($610)
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation | The following tables represent a reconciliation of the changes in fair value of financial instruments measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the years ended December 31, 2014 and 2013.
| (In Millions)
| Derivative Assets (Level 3) |  | Derivative Liabilities (Level 3)
| Year Ended December 31, |  | Year Ended December 31,
| 2014 |  | 2013 |  | 2014 |  | 2013
Beginning balance - January 1 | $ | 58.9 |  |  | $ | 62.4 |  |  | $ | (10.3 | ) |  | $ | (11.3 | )
Total gains (losses) |  |  |  |  |  |  |
Included in earnings | 187.8 |  |  | 152.3 |  |  | (11.8 | ) |  | (10.3 | )
Settlements | (183.5 | ) |  | (155.8 | ) |  | 10.3 |  |  | 11.3 |
Transfers into Level 3 | — |  |  | — |  |  | — |  |  | — |
Transfers out of Level 3 | — |  |  | — |  |  | — |  |  | — |
Ending balance - December 31 | $ | 63.2 |  |  | $ | 58.9 |  |  | $ | (11.8 | ) |  | $ | (10.3 | )
Total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) on assets still held at the reporting date | $ | 187.8 |  |  | $ | 152.3 |  |  | $ | (11.8 | ) |  | $ | (10.3 | )
Schedule Of Carrying Value And Fair Value Of Financial Instruments | A summary of the carrying amount and fair value of other financial instruments at December 31, 2014 and 2013 were as follows:
|  |  | (In Millions)
|  |  | December 31, 2014 |  | December 31, 2013
| Classification |  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
Long-term debt: |  |  |  |  |  |  |  |  |
Senior notes—$700 million | Level 2 |  | 689.5 |  |  | 367.3 |  |  | 699.4 |  |  | 718.2 |
Senior notes—$1.3 billion | Level 2 |  | 1,279.9 |  |  | 704.0 |  |  | 1,289.6 |  |  | 1,404.9 |
Senior notes—$400 million | Level 2 |  | 393.7 |  |  | 228.1 |  |  | 398.4 |  |  | 432.1 |
Senior notes—$500 million | Level 2 |  | 477.4 |  |  | 312.0 |  |  | 496.5 |  |  | 523.8 |
Revolving loan | Level 2 |  | — |  |  | — |  |  | — |  |  | — |
Equipment Loan Facilities | Level 2 |  | 119.0 |  |  | 119.0 |  |  | 140.8 |  |  | 140.8 |
Fair Value Adjustment to Interest Rate Hedge | Level 2 |  | 2.8 |  |  | 2.8 |  |  | (2.1 | ) |  | (2.1 | )
Total long-term debt |  |  | $ | 2,962.3 |  |  | $ | 1,733.2 |  |  | $ | 3,022.6 |  |  | $ | 3,217.7 |
Fair Value Measurements, Nonrecurring | The following tables present information about the impairment charges on both financial and nonfinancial assets that were measured on a fair value basis at December 31, 2014 and December 31, 2013. The table also indicates the fair value hierarchy of the valuation techniques used to determine such fair value.
|  | (In Millions)
|  | Year Ended December 31, 2014
Description |  | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total |  | Total Losses
Assets: |  |  |  |  |  |  |  |  |  |
Goodwill impairment - Asia Pacific Iron Ore reporting unit |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 73.5 |
Other long-lived assets - Property, plant and equipment and Mineral rights: |  |  |  |  |  |  |  |  |  |
Asia Pacific Iron Ore reporting unit |  | — |  |  | — |  |  | 72.4 |  |  | 72.4 |  |  | 526.5 |
North American Coal reporting unit |  |  |  |  |  |  |  |  |  |
CLCC thermal asset group |  | — |  |  | — |  |  | 62.6 |  |  | 62.6 |  |  | 195.5 |
Pinnacle asset group |  | — |  |  | — |  |  | 30.7 |  |  | 30.7 |  |  | 394.5 |
Oak Grove asset group |  | — |  |  | — |  |  | 23.4 |  |  | 23.4 |  |  | 267.5 |
Eastern Canadian Iron Ore reporting unit |  |  |  |  |  |  |  |  |  |
Bloom Lake asset group |  | — |  |  | — |  |  | 187.9 |  |  | 187.9 |  |  | 7,043.7 |
Wabush asset group |  | — |  |  | — |  |  | 42.7 |  |  | 42.7 |  |  | 132.6 |
Ferroalloys reporting unit |  | — |  |  | — |  |  | 12.2 |  |  | 12.2 |  |  | 259.5 |
Other reporting units |  | — |  |  | — |  |  | — |  |  | — |  |  | 19.2 |
Other long-lived assets - Intangibles and other long-term assets: |  |  |  |  |  |  |  |  |  |
Asia Pacific Iron Ore reporting unit |  | — |  |  | — |  |  | 7.0 |  |  | 7.0 |  |  | 24.2 |
Eastern Canadian Iron Ore reporting unit |  |  |  |  |  |  |  |  |  |
Bloom Lake asset group |  | — |  |  | — |  |  | — |  |  | — |  |  | 56.2 |
Wabush asset group |  | — |  |  | — |  |  | — |  |  | — |  |  | 36.7 |
Ferroalloys reporting unit |  | — |  |  | — |  |  | — |  |  | — |  |  | 0.3 |
Investment in ventures impairment - Global Exploration |  | — |  |  | — |  |  | — |  |  | — |  |  | 9.2 |
|  | $ | — |  |  | $ | — |  |  | $ | 438.9 |  |  | $ | 438.9 |  |  | $ | 9,039.1 |
|  | (In Millions)
|  | Year Ended December 31, 2013
Description |  | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total |  | Total Losses
Assets: |  |  |  |  |  |  |  |  |  |
Goodwill impairment - Ferroalloys reporting unit |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 80.9 |
Other long-lived assets - Property, plant and equipment |  | — |  |  | — |  |  | 46.3 |  |  | 46.3 |  |  | 155.4 |
Other long-lived assets - Intangibles and long-term deposits |  | — |  |  | — |  |  | 1.6 |  |  | 1.6 |  |  | 14.5 |
Investment in ventures impairment - Amapá |  | — |  |  | — |  |  | — |  |  | — |  |  | 67.6 |
Total |  | $ | — |  |  | $ | — |  |  | $ | 47.9 |  |  | $ | 47.9 |  |  | $ | 318.4 |

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- Definition Tabular disclosure of the fair value measurement of assets and liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References No definition available. + Details
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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19296-110258 + Details
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