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FINANCIAL INSTRUMENTS: (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Liabilities: |  |
Long-term debt, Carrying Value | $ 4,205.7 | $ 4,204.9
Long-term debt, Fair Value | 4,538.8 | 4,088.8
Short term Investment: |  |
Trading securities investment | 202.8 | 202.6
Fair value measurements recurring | Fair value as of the end of the period |  |
Short term Investment: |  |
Trading securities investment | 202.8 | 202.6
Derivative: |  |
Total assets, fair value | 430.5 | 362.4
Fair value measurements recurring | Fair value as of the end of the period | Copper |  |
Derivative: |  |
Provisionally priced sales | 105.4 | 53.9
Fair value measurements recurring | Fair value as of the end of the period | Molybdenum |  |
Derivative: |  |
Provisionally priced sales | 117.1 | 100.2
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
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 | 4.8 | 5.2
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) |  |
Short term Investment: |  |
Trading securities investment | 202.8 | 202.6
Derivative: |  |
Total assets, fair value | 425.3 | 356.7
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper |  |
Derivative: |  |
Provisionally priced sales | 105.4 | 53.9
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum |  |
Derivative: |  |
Provisionally priced sales | 117.1 | 100.2
Fair value measurements recurring | Significant other observable inputs (Level 2) |  |
Derivative: |  |
Total assets, fair value | 5.2 | 5.7
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
Fair value measurements recurring | Significant other observable inputs (Level 2) | Mortgage backed securities |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | $ 4.8 | $ 5.2

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