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FAIR VALUE MEASUREMENT: (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Liabilities: |  |
Long-term debt, Carrying Value | $ 6,255.5 | $ 6,254.6
Long-term debt, Fair Value | 6,374.6 | 6,485.9
Short-term investment: |  |
Trading securities | 329.1 | 599.1
Available-for-sale: |  |
Available-for-sale Securities, Current, Total | 0.2 | 0.2
Quoted prices in active markets for identical assets (Level 1) |  |
Liabilities: |  |
Long-term debt, Carrying Value | 6,204.3 | 6,203.4
Long-term debt, Fair Value | 6,319.4 | 6,431.9
Significant other observable inputs (Level 2) |  |
Liabilities: |  |
Long-term debt, Carrying Value | 51.2 | 51.2
Long-term debt, Fair Value | 55.1 | 54.0
Fair value measurements recurring | Fair value as of the end of the period |  |
Short-term investment: |  |
Trading securities | 329.1 | 599.1
Derivative: |  |
Total assets, fair value | 712.7 | 1,521.7
Fair value measurements recurring | Fair value as of the end of the period | Copper |  |
Derivative: |  |
Provisionally priced sales | 273.4 | 657.5
Fair value measurements recurring | Fair value as of the end of the period | Molybdenum |  |
Derivative: |  |
Provisionally priced sales | 110.0 | 264.9
Fair value measurements recurring | Asset backed securities | Fair value as of the end of the period |  |
Available-for-sale: |  |
Available-for-sale debt securities | 0.1 | 0.1
Fair value measurements recurring | Mortgage backed securities | Fair value as of the end of the period |  |
Available-for-sale: |  |
Available-for-sale debt securities | 0.1 | 0.1
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) |  |
Short-term investment: |  |
Trading securities | 329.1 | 599.1
Derivative: |  |
Total assets, fair value | 712.5 | 1,521.5
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper |  |
Derivative: |  |
Provisionally priced sales | 273.4 | 657.5
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum |  |
Derivative: |  |
Provisionally priced sales | 110.0 | 264.9
Fair value measurements recurring | Significant other observable inputs (Level 2) |  |
Available-for-sale: |  |
Available-for-sale Securities, Current, Total | 0.2 | 0.2
Fair value measurements recurring | Significant other observable inputs (Level 2) | Asset backed securities |  |
Available-for-sale: |  |
Available-for-sale debt securities | 0.1 | 0.1
Fair value measurements recurring | Significant other observable inputs (Level 2) | Mortgage backed securities |  |
Available-for-sale: |  |
Available-for-sale debt securities | $ 0.1 | $ 0.1

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