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FAIR VALUE MEASUREMENT: (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Liabilities: |  |
Long-term debt, Carrying Value | $ 5,961.7 | $ 5,960.1
Long-term debt, Fair Value | 7,107.5 | 6,301.7
Short-term investment: |  |
Trading securities | 118.0 | 213.1
Available-for-sale debt securities: |  |
Available-for-sale Securities, Current, Total | 0.8 | 0.7
Quoted prices in active markets for identical assets (Level 1) |  |
Liabilities: |  |
Long-term debt, Carrying Value | 5,211.9 | 5,210.7
Long-term debt, Fair Value | 6,323.5 | 5,540.0
Significant other observable inputs (Level 2) |  |
Liabilities: |  |
Long-term debt, Carrying Value | 749.8 | 749.4
Long-term debt, Fair Value | 784.0 | 761.7
Fair value measurements recurring | Fair value as of the end of the period |  |
Short-term investment: |  |
Trading securities | 118.0 | 213.1
Derivative: |  |
Total assets, fair value | 618.2 | 595.5
Fair value measurements recurring | Fair value as of the end of the period | Copper |  |
Derivative: |  |
Provisionally priced sales | 335.5 | 274.3
Fair value measurements recurring | Fair value as of the end of the period | Molybdenum |  |
Derivative: |  |
Provisionally priced sales | 163.9 | 107.4
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 | 0.4 | 0.4
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 | 0.3
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) |  |
Short-term investment: |  |
Trading securities | 118.0 | 213.1
Derivative: |  |
Total assets, fair value | 617.4 | 594.8
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper |  |
Derivative: |  |
Provisionally priced sales | 335.5 | 274.3
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum |  |
Derivative: |  |
Provisionally priced sales | 163.9 | 107.4
Fair value measurements recurring | Significant other observable inputs (Level 2) |  |
Available-for-sale debt securities: |  |
Available-for-sale Securities, Current, Total | 0.8 | 0.7
Fair value measurements recurring | Significant other observable inputs (Level 2) | Asset backed securities |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 0.4 | 0.4
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 | $ 0.3

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