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FINANCIAL INSTRUMENTS: (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2011 Fair value measurements recurring Fair value as of the end of the period | Dec. 31, 2010 Fair value measurements recurring Fair value as of the end of the period | Dec. 31, 2010 Fair value measurements recurring Fair value as of the end of the period Swap contracts | Dec. 31, 2011 Fair value measurements recurring Fair value as of the end of the period Zero cost collar contracts | Dec. 31, 2010 Fair value measurements recurring Fair value as of the end of the period Zero cost collar contracts | Dec. 31, 2011 Fair value measurements recurring Fair value as of the end of the period Copper | Dec. 31, 2010 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 Molybdenum | Dec. 31, 2010 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 Corporate bonds | Dec. 31, 2010 Fair value measurements recurring Fair value as of the end of the period Corporate bonds | Dec. 31, 2010 Fair value measurements recurring Fair value as of the end of the period Asset backed obligations | Dec. 31, 2011 Fair value measurements recurring Fair value as of the end of the period Mortgage backed securities | Dec. 31, 2010 Fair value measurements recurring Fair value as of the end of the period Mortgage backed securities | Dec. 31, 2011 Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) | Dec. 31, 2010 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) Copper | Dec. 31, 2010 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) Molybdenum | Dec. 31, 2010 Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) Molybdenum | Dec. 31, 2011 Fair value measurements recurring Significant other observable inputs (Level 2) | Dec. 31, 2010 Fair value measurements recurring Significant other observable inputs (Level 2) | Dec. 31, 2010 Fair value measurements recurring Significant other observable inputs (Level 2) Swap contracts | Dec. 31, 2011 Fair value measurements recurring Significant other observable inputs (Level 2) Zero cost collar contracts | Dec. 31, 2010 Fair value measurements recurring Significant other observable inputs (Level 2) Zero cost collar contracts | Dec. 31, 2011 Fair value measurements recurring Significant other observable inputs (Level 2) Corporate bonds | Dec. 31, 2010 Fair value measurements recurring Significant other observable inputs (Level 2) Corporate bonds | Dec. 31, 2010 Fair value measurements recurring Significant other observable inputs (Level 2) Asset backed obligations | Dec. 31, 2011 Fair value measurements recurring Significant other observable inputs (Level 2) Mortgage backed securities | Dec. 31, 2010 Fair value measurements recurring Significant other observable inputs (Level 2) Mortgage backed securities | Dec. 31, 2010 Fair value measurements recurring Significant unobservable inputs (Level 3) | Dec. 31, 2010 Fair value measurements recurring Significant unobservable inputs (Level 3) Mortgage backed securities | Dec. 31, 2011 Mitsui loan
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, Carrying Value | $ 2,745.7 | $ 2,760.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, Fair Value | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00%
Short term Investment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trading securities investment |  |  | 514.6 | 66.9 |  |  |  |  |  |  |  |  |  |  |  |  | 514.6 | 66.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities |  |  |  |  |  |  |  |  |  |  |  | 0.5 | 0.4 | 0.3 | 6.8 | 8.6 |  |  |  |  |  |  |  |  |  |  |  | 0.5 | 0.4 | 0.3 | 6.8 | 7.4 |  | 1.2 |
Derivative: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives - classified as cash flow hedges: |  |  |  |  |  | 8.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.9 |  |  |  |  |  |  |  |  |
Provisionally priced sales |  |  |  |  |  |  |  | 221.5 | 60.7 | 138.1 | 149.7 |  |  |  |  |  |  |  | 221.5 | 60.7 | 138.1 | 149.7 |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets, fair value |  |  | 890.4 |  |  |  |  |  |  |  |  |  |  |  |  |  | 874.2 |  |  |  |  |  | 16.2 |  |  |  |  |  |  |  |  |  |  |  |
Other current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability derivatives Classified as cash flow hedges: |  |  |  |  | (124.4) |  | (72.6) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (124.4) |  | (72.6) |  |  |  |  |  |  |  |
Total |  |  |  | $ 89.6 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 277.3 |  |  |  |  |  | $ (188.9) |  |  |  |  |  |  |  |  | $ 1.2 |  |

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