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FAIR VALUE MEASUREMENT: (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Liabilities: |  |
Long-term debt, Carrying Value | $ 6,941.8 | $ 6,940.8
Long-term debt, Fair Value | 7,461.4 | 8,451.4
Short-term investment: |  |
Trading securities | 40.1 | 80.0
Available-for-sale debt securities: |  |
Available-for-sale Securities, Current, Total | 0.6 | 0.7
Quoted prices in active markets for identical assets (Level 1) |  |
Liabilities: |  |
Long-term debt, Carrying Value | 6,191.4 | 6,190.6
Long-term debt, Fair Value | 6,712.2 | 7,675.3
Significant other observable inputs (Level 2) |  |
Liabilities: |  |
Long-term debt, Carrying Value | 750.4 | 750.2
Long-term debt, Fair Value | 749.2 | 776.1
Fair value measurements recurring | Fair value as of the end of the period |  |
Short-term investment: |  |
Trading securities | 40.1 | 80.0
Derivative: |  |
Total assets, fair value | 353.0 | 534.0
Fair value measurements recurring | Fair value as of the end of the period | Copper |  |
Derivative: |  |
Provisionally priced sales | 187.2 | 326.5
Fair value measurements recurring | Fair value as of the end of the period | Molybdenum |  |
Derivative: |  |
Provisionally priced sales | 125.1 | 126.8
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 | 0.4
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 | 0.3 | 0.3
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) |  |
Short-term investment: |  |
Trading securities | 40.1 | 80.0
Derivative: |  |
Total assets, fair value | 352.4 | 533.3
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper |  |
Derivative: |  |
Provisionally priced sales | 187.2 | 326.5
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum |  |
Derivative: |  |
Provisionally priced sales | 125.1 | 126.8
Fair value measurements recurring | Significant other observable inputs (Level 2) |  |
Available-for-sale debt securities: |  |
Available-for-sale Securities, Current, Total | 0.6 | 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 | 0.3 | 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 | $ 0.3 | $ 0.3

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