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v3.25.3

FAIR VALUE MEASUREMENT: (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Short term investments: |  |
Trading securities | $ 575.8 | $ 245.2
Carrying Value |  |
Liabilities: |  |
Total long-term debt | 6,749.4 | 5,758.5
Fair Value |  |
Liabilities: |  |
Total long-term debt | 6,906.1 | 5,706.7
Quoted prices in active markets for identical assets (Level 1) | Carrying Value |  |
Liabilities: |  |
Current portion of long term debt |  | 499.8
Total long-term debt | 6,698.3 | 5,707.3
Quoted prices in active markets for identical assets (Level 1) | Fair Value |  |
Liabilities: |  |
Current portion of long term debt |  | 498.4
Total long-term debt | 6,825.4 | 5,653.6
Significant other observable inputs (Level 2) | Carrying Value |  |
Liabilities: |  |
Total long-term debt | 51.2 | 51.2
Significant other observable inputs (Level 2) | Fair Value |  |
Liabilities: |  |
Total long-term debt | 80.7 | 53.1
Fair value measurements recurring | Maximum |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities | 0.1 |
Fair value measurements recurring | Fair Value |  |
Short term investments: |  |
Trading securities | 575.8 | 245.2
Derivative: |  |
Total assets, fair value | 2,296.0 | 1,109.3
Fair value measurements recurring | Fair Value | Copper |  |
Derivative: |  |
Provisionally priced sales | 1,248.2 | 589.5
Fair value measurements recurring | Fair Value | Molybdenum |  |
Derivative: |  |
Provisionally priced sales | 425.4 | 274.5
Fair value measurements recurring | Fair Value | Zinc |  |
Derivative: |  |
Provisionally priced sales | 46.5 |
Fair value measurements recurring | Mortgage backed securities | Fair Value |  |
Available-for-sale debt securities: |  |
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 investments: |  |
Trading securities | 575.8 | 245.2
Derivative: |  |
Total assets, fair value | 2,295.9 | 1,109.2
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper |  |
Derivative: |  |
Provisionally priced sales | 1,248.2 | 589.5
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum |  |
Derivative: |  |
Provisionally priced sales | 425.4 | 274.5
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Zinc |  |
Derivative: |  |
Provisionally priced sales | 46.5 |
Fair value measurements recurring | Significant other observable inputs (Level 2) |  |
Derivative: |  |
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

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