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FINANCIAL INSTRUMENTS: (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Liabilities: |  |
Long-term debt, Carrying Value | $ 5,952.1 | $ 5,951.5
Long-term debt, Fair Value | 5,705.6 | 5,211.5
Short term Investment: |  |
Trading securities | 279.6 | 600.2
Fair value measurements recurring | Fair value as of the end of the period |  |
Short term Investment: |  |
Trading securities | 279.6 | 600.2
Derivative: |  |
Total assets, fair value | 672.6 | 1,016.9
Fair value measurements recurring | Fair value as of the end of the period | Copper |  |
Derivative: |  |
Provisionally priced sales | 309.3 | 351.0
Fair value measurements recurring | Fair value as of the end of the period | Molybdenum |  |
Derivative: |  |
Provisionally priced sales | 80.7 | 62.4
Fair value measurements recurring | Corporate bonds | Fair value as of the end of the period |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 0.1 | 0.2
Fair value measurements recurring | Mortgage backed securities | Fair value as of the end of the period |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 2.9 | 3.1
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) |  |
Short term Investment: |  |
Trading securities | 279.6 | 600.2
Derivative: |  |
Total assets, fair value | 669.6 | 1,013.6
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper |  |
Derivative: |  |
Provisionally priced sales | 309.3 | 351.0
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum |  |
Derivative: |  |
Provisionally priced sales | 80.7 | 62.4
Fair value measurements recurring | Significant other observable inputs (Level 2) |  |
Derivative: |  |
Total assets, fair value | 3.0 | 3.3
Fair value measurements recurring | Significant other observable inputs (Level 2) | Corporate bonds |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 0.1 | 0.2
Fair value measurements recurring | Significant other observable inputs (Level 2) | Mortgage backed securities |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | $ 2.9 | $ 3.1

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