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FINANCIAL INSTRUMENTS: (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended
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Mar. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2012 Fair value measurements recurring Fair value as of the end of the period | Dec. 31, 2011 Fair value measurements recurring Fair value as of the end of the period | Dec. 31, 2011 Fair value measurements recurring Fair value as of the end of the period Zero cost collar contracts | Mar. 31, 2012 Fair value measurements recurring Fair value as of the end of the period Copper | Dec. 31, 2011 Fair value measurements recurring Fair value as of the end of the period Copper | Mar. 31, 2012 Fair value measurements recurring Fair value as of the end of the period Molybdenum | Dec. 31, 2011 Fair value measurements recurring Fair value as of the end of the period Molybdenum | Mar. 31, 2012 Fair value measurements recurring Fair value as of the end of the period Corporate bonds | Dec. 31, 2011 Fair value measurements recurring Fair value as of the end of the period Corporate bonds | Mar. 31, 2012 Fair value measurements recurring Fair value as of the end of the period Asset backed obligations | Mar. 31, 2012 Fair value measurements recurring Fair value as of the end of the period Mortgage backed securities | Dec. 31, 2011 Fair value measurements recurring Fair value as of the end of the period Mortgage backed securities | Mar. 31, 2012 Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) | Dec. 31, 2011 Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) | Mar. 31, 2012 Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) Copper | Dec. 31, 2011 Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) Copper | Mar. 31, 2012 Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) Molybdenum | Dec. 31, 2011 Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) Molybdenum | Mar. 31, 2012 Fair value measurements recurring Significant other observable inputs (Level 2) | Dec. 31, 2011 Fair value measurements recurring Significant other observable inputs (Level 2) | Dec. 31, 2011 Fair value measurements recurring Significant other observable inputs (Level 2) Zero cost collar contracts | Mar. 31, 2012 Fair value measurements recurring Significant other observable inputs (Level 2) Corporate bonds | Dec. 31, 2011 Fair value measurements recurring Significant other observable inputs (Level 2) Corporate bonds | Mar. 31, 2012 Fair value measurements recurring Significant other observable inputs (Level 2) Asset backed obligations | Mar. 31, 2012 Fair value measurements recurring Significant other observable inputs (Level 2) Mortgage backed securities | Dec. 31, 2011 Fair value measurements recurring Significant other observable inputs (Level 2) Mortgage backed securities | Mar. 31, 2012 Mitsui loan
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, Carrying Value | $ 2,745.9 | $ 2,745.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, Fair Value | 3,128.2 | 2,974.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair values of assets and liabilities measured at fair value on a recurring basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value calculation, present value based on cash flow discount rate, weighted average cost of capital (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00%
Short term Investment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trading securities investment |  |  | 220.0 | 514.6 |  |  |  |  |  |  |  |  |  |  | 220.0 | 514.6 |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities |  |  |  |  |  |  |  |  |  | 0.6 | 0.5 | 0.1 | 6.6 | 6.8 |  |  |  |  |  |  |  |  |  | 0.6 | 0.5 | 0.1 | 6.6 | 6.8 |
Derivative: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives - classified as cash flow hedges: |  |  |  |  | 8.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.9 |  |  |  |  |  |
Provisionally priced sales |  |  |  |  |  | 60.0 | 221.5 | 126.5 | 138.1 |  |  |  |  |  |  |  | 60.0 | 221.5 | 126.5 | 138.1 |  |  |  |  |  |  |  |  |
Total assets, fair value |  |  | $ 413.8 | $ 890.4 |  |  |  |  |  |  |  |  |  |  | $ 406.5 | $ 874.2 |  |  |  |  | $ 7.3 | $ 16.2 |  |  |  |  |  |  |

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