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FINANCIAL INSTRUMENTS: (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Liabilities: |  |
Long-term debt, Carrying Value | $ 4,204.9 | $ 4,213.9
Long-term debt, Fair Value | 4,088.8 |
Fair value measurements recurring | Fair value as of the end of the period |  |
Short term Investment: |  |
Trading securities investment | 202.6 | 127.8
Derivative: |  |
Total assets, fair value | 362.4 | 308.0
Fair value measurements recurring | Fair value as of the end of the period | Copper |  |
Derivative: |  |
Provisionally priced sales | 53.9 | 70.8
Fair value measurements recurring | Fair value as of the end of the period | Molybdenum |  |
Derivative: |  |
Provisionally priced sales | 100.2 | 102.9
Fair value measurements recurring | Fair value as of the end of the period | Corporate bonds |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 0.4 | 0.4
Fair value measurements recurring | Fair value as of the end of the period | Asset backed securities |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 0.1 | 0.1
Fair value measurements recurring | Fair value as of the end of the period | Mortgage backed securities |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 5.2 | 6.0
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) |  |
Short term Investment: |  |
Trading securities investment | 202.6 | 127.8
Derivative: |  |
Total assets, fair value | 356.7 | 301.5
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper |  |
Derivative: |  |
Provisionally priced sales | 53.9 | 70.8
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum |  |
Derivative: |  |
Provisionally priced sales | 100.2 | 102.9
Fair value measurements recurring | Significant other observable inputs (Level 2) |  |
Derivative: |  |
Total assets, fair value | 5.7 | 6.5
Fair value measurements recurring | Significant other observable inputs (Level 2) | Corporate bonds |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 0.4 | 0.4
Fair value measurements recurring | Significant other observable inputs (Level 2) | Asset backed securities |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 0.1 | 0.1
Fair value measurements recurring | Significant other observable inputs (Level 2) | Mortgage backed securities |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | $ 5.2 | $ 6.0

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