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FINANCIAL INSTRUMENTS: (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Liabilities: |  |
Long-term debt, Carrying Value | $ 5,959.3 | $ 5,957.1
Long-term debt, Fair Value | 6,653.1 | 7,295.0
Short-term investment: |  |
Trading securities | 235.8 | 49.5
Available-for-sale debt securities: |  |
Available-for-sale Securities, Current, Total | 0.7 | 1.0
Quoted prices in active markets for identical assets (Level 1) |  |
Liabilities: |  |
Long-term debt, Carrying Value | 5,210.1 | 5,208.4
Long-term debt, Fair Value | 5,880.7 | 6,488.9
Significant other observable inputs (Level 2) |  |
Liabilities: |  |
Long-term debt, Carrying Value | 749.2 | 748.7
Long-term debt, Fair Value | 772.4 | 806.1
Fair value measurements recurring | Fair value as of the end of the period |  |
Short-term investment: |  |
Trading securities | 235.8 | 49.5
Derivative: |  |
Total assets, fair value | 515.1 | 337.9
Fair value measurements recurring | Fair value as of the end of the period | Copper |  |
Derivative: |  |
Provisionally priced sales | 143.8 | 184.6
Fair value measurements recurring | Fair value as of the end of the period | Molybdenum |  |
Derivative: |  |
Provisionally priced sales | 134.8 | 102.8
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 | 0.1
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 | 0.3 | 0.5
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 | 0.3 | 0.4
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) |  |
Short-term investment: |  |
Trading securities | 235.8 | 49.5
Derivative: |  |
Total assets, fair value | 514.4 | 336.9
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper |  |
Derivative: |  |
Provisionally priced sales | 143.8 | 184.6
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum |  |
Derivative: |  |
Provisionally priced sales | 134.8 | 102.8
Fair value measurements recurring | Significant other observable inputs (Level 2) |  |
Available-for-sale debt securities: |  |
Available-for-sale Securities, Current, Total | 0.7 | 1.0
Fair value measurements recurring | Significant other observable inputs (Level 2) | Corporate bonds |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 0.1 | 0.1
Fair value measurements recurring | Significant other observable inputs (Level 2) | Asset backed securities |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 0.3 | 0.5
Fair value measurements recurring | Significant other observable inputs (Level 2) | Mortgage backed securities |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | $ 0.3 | $ 0.4

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