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PROPERTY: (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Property |  |  |
Total property | $ 9,412,300,000 | $ 8,416,700,000 |
Accumulated depreciation, amortization and depletion | (4,255,600,000) | (3,986,800,000) |
Total property, net | 5,156,731,000 | 4,429,906,000 | 4,095,000,000
Depreciation and depletion expense | 323,500,000 | 286,000,000 | 279,600,000
Buildings and equipment |  |  |
Property |  |  |
Total property | 7,497,300,000 | 6,921,800,000 |
Construction in progress |  |  |
Property |  |  |
Total property | 1,617,600,000 | 1,197,800,000 |
Mine development |  |  |
Property |  |  |
Total property | 250,700,000 | 250,700,000 |
Total property, net | 37,900,000 | 39,800,000 |
Land, other than mineral |  |  |
Property |  |  |
Total property | $ 46,700,000 | $ 46,400,000 |

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- Definition The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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
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