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FAIR VALUE MEASUREMENT: (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 item | Dec. 31, 2022 USD ($) item | Dec. 31, 2021 USD ($)
Liabilities: |  |  |
Long-term debt, Carrying Value |  | $ 6,251.2 | $ 6,547.6
Long-term debt, Fair Value |  | 6,426.8 | 8,573.2
Short-term investment: |  |  |
Trading securities |  | 208.0 | 486.5
Available-for-sale: |  |  |
Available-for-sale debt securities |  | 0.3 | 0.4
Available-for-sale Securities, Current, Total |  | $ 0.3 | 0.4
Derivative: |  |  |
Number of derivative contracts entered | item | 2 | 2 |
Quoted prices in active markets for identical assets (Level 1) |  |  |
Liabilities: |  |  |
Long-term debt, Carrying Value |  | $ 6,200.0 | 6,496.4
Long-term debt, Fair Value |  | 6,372.6 | 8,506.0
Significant other observable inputs (Level 2) |  |  |
Liabilities: |  |  |
Long-term debt, Carrying Value |  | 51.2 | 51.2
Long-term debt, Fair Value |  | 54.2 | 67.2
Fair value measurements recurring | Fair value as of the end of the period |  |  |
Short-term investment: |  |  |
Trading securities |  | 208.0 | 486.5
Derivative: |  |  |
Total assets, fair value |  | 1,717.2 | 1,651.4
Fair value measurements recurring | Fair value as of the end of the period | Copper |  |  |
Derivative: |  |  |
Provisionally priced sales |  | 1,052.0 | 876.2
Fair value measurements recurring | Fair value as of the end of the period | Molybdenum |  |  |
Derivative: |  |  |
Provisionally priced sales |  | 456.9 | 288.3
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 | 0.2
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 |  | 208.0 | 486.5
Derivative: |  |  |
Total assets, fair value |  | 1,716.9 | 1,651.0
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper |  |  |
Derivative: |  |  |
Provisionally priced sales |  | 1,052.0 | 876.2
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum |  |  |
Derivative: |  |  |
Provisionally priced sales |  | 456.9 | 288.3
Fair value measurements recurring | Significant other observable inputs (Level 2) |  |  |
Available-for-sale: |  |  |
Available-for-sale Securities, Current, Total |  | 0.3 | 0.4
Fair value measurements recurring | Significant other observable inputs (Level 2) | Asset backed securities |  |  |
Available-for-sale: |  |  |
Available-for-sale debt securities |  | 0.1 | 0.2
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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