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FAIR VALUE MEASUREMENT: (Details) $ in Millions | 5 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2022 item | Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
Liabilities: |  |  |
Long-term debt, Carrying Value |  | $ 6,253.8 | $ 6,251.2
Long-term debt, Fair Value |  | 5,947.0 | 6,426.8
Short-term investment: |  |  |
Trading securities |  | 246.8 | 208.0
Available-for-sale: |  |  |
Available-for-sale Securities, Current, Total |  | 0.3 | 0.3
Derivative: |  |  |
Number of derivative contracts entered | item | 2 |  |
Quoted prices in active markets for identical assets (Level 1) |  |  |
Liabilities: |  |  |
Long-term debt, Carrying Value |  | 6,202.6 | 6,200.0
Long-term debt, Fair Value |  | 5,892.7 | 6,372.6
Significant other observable inputs (Level 2) |  |  |
Liabilities: |  |  |
Long-term debt, Carrying Value |  | 51.2 | 51.2
Long-term debt, Fair Value |  | 54.3 | 54.2
Fair value measurements recurring | Fair value as of the end of the period |  |  |
Short-term investment: |  |  |
Trading securities |  | 246.8 | 208.0
Derivative: |  |  |
Total assets, fair value |  | 1,380.1 | 1,717.2
Fair value measurements recurring | Fair value as of the end of the period | Copper |  |  |
Derivative: |  |  |
Provisionally priced sales |  | 776.6 | 1,052.0
Fair value measurements recurring | Fair value as of the end of the period | Molybdenum |  |  |
Derivative: |  |  |
Provisionally priced sales |  | 356.4 | 456.9
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 |  | 0.2 | 0.2
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) |  |  |
Short-term investment: |  |  |
Trading securities |  | 246.8 | 208.0
Derivative: |  |  |
Total assets, fair value |  | 1,379.8 | 1,716.9
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper |  |  |
Derivative: |  |  |
Provisionally priced sales |  | 776.6 | 1,052.0
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum |  |  |
Derivative: |  |  |
Provisionally priced sales |  | 356.4 | 456.9
Fair value measurements recurring | Significant other observable inputs (Level 2) |  |  |
Available-for-sale: |  |  |
Available-for-sale Securities, Current, Total |  | 0.3 | 0.3
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 |  | $ 0.2 | $ 0.2

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