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FINANCIAL INSTRUMENTS: (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Liabilities: |  |
Long-term debt, Carrying Value | $ 5,954.9 | $ 5,954.2
Long-term debt, Fair Value | 6,491.8 | 6,212.0
Short-term Investment: |  |
Trading securities | 50.6 | 49.2
Available-for-sale debt securities: |  |
Available-for-sale Securities, Current, Total | 2.1 | 2.1
Fair value measurements recurring | Fair value as of the end of the period |  |
Short-term Investment: |  |
Trading securities | 50.6 | 49.2
Derivative: |  |
Total assets, fair value | 279.4 | 309.1
Fair value measurements recurring | Fair value as of the end of the period | Copper |  |
Derivative: |  |
Provisionally priced sales | 135.0 | 203.8
Fair value measurements recurring | Fair value as of the end of the period | Molybdenum |  |
Derivative: |  |
Provisionally priced sales | 91.7 | 54.0
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 |
Fair value measurements recurring | Asset backed securities | Fair value as of the end of the period |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 1.6 |
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 | 0.4 | 2.1
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) |  |
Short-term Investment: |  |
Trading securities | 50.6 | 49.2
Derivative: |  |
Total assets, fair value | 277.3 | 307.0
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper |  |
Derivative: |  |
Provisionally priced sales | 135.0 | 203.8
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum |  |
Derivative: |  |
Provisionally priced sales | 91.7 | 54.0
Fair value measurements recurring | Significant other observable inputs (Level 2) |  |
Available-for-sale debt securities: |  |
Available-for-sale Securities, Current, Total | 2.1 | 2.1
Fair value measurements recurring | Significant other observable inputs (Level 2) | Corporate bonds |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 0.1 |
Fair value measurements recurring | Significant other observable inputs (Level 2) | Asset backed securities |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 1.6 |
Fair value measurements recurring | Significant other observable inputs (Level 2) | Mortgage backed securities |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | $ 0.4 | $ 2.1

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