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FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Liabilities: |  |
Long-term debt, Carrying Value | $ 5,951.5 | $ 4,180.9
Long-term debt, Fair Value | 5,211.5 | 4,369.6
Short term Investment: |  |
Trading securities | 600.2 | 333.7
Fair value measurements recurring | Fair value as of the end of the period |  |
Short term Investment: |  |
Trading securities | 600.2 | 333.7
Derivative: |  |
Total assets, fair value | 1,016.9 | 646.3
Fair value measurements recurring | Fair value as of the end of the period | Copper |  |
Derivative: |  |
Provisionally priced sales | 351.0 | 202.2
Fair value measurements recurring | Fair value as of the end of the period | Molybdenum |  |
Derivative: |  |
Provisionally priced sales | 62.4 | 105.5
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 | 0.2 | 0.3
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 | 3.1 | 4.6
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) |  |
Short term Investment: |  |
Trading securities | 600.2 | 333.7
Derivative: |  |
Total assets, fair value | 1,013.6 | 641.4
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper |  |
Derivative: |  |
Provisionally priced sales | 351.0 | 202.2
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum |  |
Derivative: |  |
Provisionally priced sales | 62.4 | 105.5
Fair value measurements recurring | Significant other observable inputs (Level 2) |  |
Derivative: |  |
Total assets, fair value | 3.3 | 4.9
Fair value measurements recurring | Significant other observable inputs (Level 2) | Corporate bonds |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 0.2 | 0.3
Fair value measurements recurring | Significant other observable inputs (Level 2) | Mortgage backed securities |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | $ 3.1 | $ 4.6

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