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FAIR VALUE MEASUREMENT: (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Short term investment: |  |
Trading securities | $ 1,664.8 | $ 604.5
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) |  |
Short term investment: |  |
Trading securities | 1,664.8 | 604.5
Embedded derivatives-Not classified as hedges: |  |
Total assets, fair value | 3,301.3 | 2,366.2
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper |  |
Embedded derivatives-Not classified as hedges: |  |
Provisionally priced sales | 1,112.9 | 1,297.5
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum |  |
Embedded derivatives-Not classified as hedges: |  |
Provisionally priced sales | 442.6 | 383.8
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Zinc |  |
Embedded derivatives-Not classified as hedges: |  |
Provisionally priced sales | 81.0 | 80.3
Fair value measurements recurring | Significant other observable inputs (Level 2) |  |
Embedded derivatives-Not classified as hedges: |  |
Total assets, fair value | 0.1 | 0.1
Fair value measurements recurring | Significant other observable inputs (Level 2) | Mortgage backed securities |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 0.1 | 0.1
Carrying Value |  |
Liabilities: |  |
Total long-term debt | 7,994.4 | 6,750.7
Carrying Value | Quoted prices in active markets for identical assets (Level 1) |  |
Liabilities: |  |
Total long-term debt | 7,943.3 | 6,699.5
Carrying Value | Significant other observable inputs (Level 2) |  |
Liabilities: |  |
Total long-term debt | 51.2 | 51.2
Fair Value |  |
Liabilities: |  |
Total long-term debt | 8,136.4 | 7,064.6
Fair Value | Quoted prices in active markets for identical assets (Level 1) |  |
Liabilities: |  |
Total long-term debt | 8,083.2 | 7,009.5
Fair Value | Significant other observable inputs (Level 2) |  |
Liabilities: |  |
Total long-term debt | 53.2 | 55.1
Fair Value | Fair value measurements recurring |  |
Short term investment: |  |
Trading securities | 1,664.8 | 604.5
Embedded derivatives-Not classified as hedges: |  |
Total assets, fair value | 3,301.4 | 2,366.3
Fair Value | Fair value measurements recurring | Copper |  |
Embedded derivatives-Not classified as hedges: |  |
Provisionally priced sales | 1,112.9 | 1,297.5
Fair Value | Fair value measurements recurring | Molybdenum |  |
Embedded derivatives-Not classified as hedges: |  |
Provisionally priced sales | 442.6 | 383.8
Fair Value | Fair value measurements recurring | Zinc |  |
Embedded derivatives-Not classified as hedges: |  |
Provisionally priced sales | 81.0 | 80.3
Fair Value | Fair value measurements recurring | Mortgage backed securities |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | $ 0.1 | $ 0.1

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