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FINANCIAL INSTRUMENTS: (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended
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Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Fair value measurements recurring Fair value as of the end of the period | Dec. 31, 2012 Fair value measurements recurring Fair value as of the end of the period | Mar. 31, 2013 Fair value measurements recurring Fair value as of the end of the period Copper | Dec. 31, 2012 Fair value measurements recurring Fair value as of the end of the period Copper | Mar. 31, 2013 Fair value measurements recurring Fair value as of the end of the period Molybdenum | Dec. 31, 2012 Fair value measurements recurring Fair value as of the end of the period Molybdenum | Mar. 31, 2013 Fair value measurements recurring Fair value as of the end of the period Corporate bonds | Dec. 31, 2012 Fair value measurements recurring Fair value as of the end of the period Corporate bonds | Mar. 31, 2013 Fair value measurements recurring Fair value as of the end of the period Asset backed obligations | Dec. 31, 2012 Fair value measurements recurring Fair value as of the end of the period Asset backed obligations | Mar. 31, 2013 Fair value measurements recurring Fair value as of the end of the period Mortgage backed securities | Dec. 31, 2012 Fair value measurements recurring Fair value as of the end of the period Mortgage backed securities | Mar. 31, 2013 Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) | Dec. 31, 2012 Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) | Mar. 31, 2013 Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) Copper | Dec. 31, 2012 Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) Copper | Mar. 31, 2013 Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) Molybdenum | Dec. 31, 2012 Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) Molybdenum | Mar. 31, 2013 Fair value measurements recurring Significant other observable inputs (Level 2) | Dec. 31, 2012 Fair value measurements recurring Significant other observable inputs (Level 2) | Mar. 31, 2013 Fair value measurements recurring Significant other observable inputs (Level 2) Corporate bonds | Dec. 31, 2012 Fair value measurements recurring Significant other observable inputs (Level 2) Corporate bonds | Mar. 31, 2013 Fair value measurements recurring Significant other observable inputs (Level 2) Asset backed obligations | Dec. 31, 2012 Fair value measurements recurring Significant other observable inputs (Level 2) Asset backed obligations | Mar. 31, 2013 Fair value measurements recurring Significant other observable inputs (Level 2) Mortgage backed securities | Dec. 31, 2012 Fair value measurements recurring Significant other observable inputs (Level 2) Mortgage backed securities | Mar. 31, 2013 Mitsui loan
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, Carrying Value | $ 4,214.1 | $ 4,213.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, Fair Value | 4,654.4 | 4,870.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  | 198.0 | 127.8 |  |  |  |  |  |  |  |  |  |  | 198.0 | 127.8 |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities |  |  |  |  |  |  |  |  | 0.5 | 0.4 | 0.1 | 0.1 | 5.9 | 6.0 |  |  |  |  |  |  |  |  | 0.5 | 0.4 | 0.1 | 0.1 | 5.9 | 6.0 |
Derivative: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisionally priced sales |  |  |  |  | 30.1 | 70.8 | 100.7 | 102.9 |  |  |  |  |  |  |  |  | 30.1 | 70.8 | 100.7 | 102.9 |  |  |  |  |  |  |  |  |
Total assets, fair value |  |  | $ 335.3 | $ 308.0 |  |  |  |  |  |  |  |  |  |  | $ 328.8 | $ 301.5 |  |  |  |  | $ 6.5 | $ 6.5 |  |  |  |  |  |  |

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