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FINANCIAL INSTRUMENTS: (Details) (USD $) In Millions, unless otherwise specified |  |  | 6 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Jun. 30, 2011 | Dec. 31, 2010 | Jun. 30, 2011 Mitsui loan | Jun. 30, 2011 Copper Fair value measurements recurring Fair value as of the end of the period | Dec. 31, 2010 Copper Fair value measurements recurring Fair value as of the end of the period | Jun. 30, 2011 Copper Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) | Dec. 31, 2010 Copper Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) | Jun. 30, 2011 Molybdenum Fair value measurements recurring Fair value as of the end of the period | Dec. 31, 2010 Molybdenum Fair value measurements recurring Fair value as of the end of the period | Jun. 30, 2011 Molybdenum Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) | Dec. 31, 2010 Molybdenum Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) | Jun. 30, 2011 Zero cost collar contracts Fair value measurements recurring Fair value as of the end of the period | Dec. 31, 2010 Zero cost collar contracts Fair value measurements recurring Fair value as of the end of the period | Jun. 30, 2011 Zero cost collar contracts Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) | Dec. 31, 2010 Zero cost collar contracts Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) | Jun. 30, 2011 Swap contracts Fair value measurements recurring Fair value as of the end of the period | Dec. 31, 2010 Swap contracts Fair value measurements recurring Fair value as of the end of the period | Jun. 30, 2011 Swap contracts Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) | Dec. 31, 2010 Swap contracts Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) | Jun. 30, 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 | Jun. 30, 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 | Jun. 30, 2011 Fair value measurements recurring Fair value as of the end of the period Asset backed obligations | Dec. 31, 2010 Fair value measurements recurring Fair value as of the end of the period Asset backed obligations | Jun. 30, 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 | Jun. 30, 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) | Jun. 30, 2011 Fair value measurements recurring Significant other observable inputs (Level 2) | Dec. 31, 2010 Fair value measurements recurring Significant other observable inputs (Level 2) | Jun. 30, 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 | Jun. 30, 2011 Fair value measurements recurring Significant other observable inputs (Level 2) Asset backed obligations | Dec. 31, 2010 Fair value measurements recurring Significant other observable inputs (Level 2) Asset backed obligations | Jun. 30, 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
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, Carrying Value | $ 2,750.4 | $ 2,760.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, Fair Value | 2,854.1 | 2,982.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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) |  |  | 11.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short term Investment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trading securities investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 216.4 | 66.9 |  |  |  |  |  |  | 216.4 | 66.9 |  |  |  |  |  |  |  |  |  |
Available for sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.5 | 0.4 | 0.2 | 0.3 | 8.0 | 8.6 |  |  |  |  | 0.5 | 0.4 | 0.2 | 0.3 | 8.0 | 7.4 |  | 1.2
Derivative: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisionally priced sales |  |  |  | 322.9 | 60.7 | 322.9 | 60.7 | 139.4 | 149.5 | 139.4 | 149.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability derivatives Classified as cash flow hedges: |  |  |  |  |  |  |  |  |  |  |  | (13.9) | (72.6) | (13.9) | (72.6) | (45.6) | (124.4) | (45.6) | (124.4) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 627.9 | $ 89.4 |  |  |  |  |  |  | $ 619.2 | $ 80.1 | $ 8.7 | $ 8.1 |  |  |  |  |  |  | $ 1.2 |

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