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FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Liabilities: |  |
Long-term debt, Carrying Value | $ 6,548.5 | $ 6,547.6
Long-term debt, Fair Value | 7,721.6 | 8,573.2
Short-term investment: |  |
Trading securities | 406.1 | 486.5
Available-for-sale: |  |
Available-for-sale Securities, Current, Total | 0.4 | 0.4
Quoted prices in active markets for identical assets (Level 1) |  |
Liabilities: |  |
Long-term debt, Carrying Value | 6,497.3 | 6,496.4
Long-term debt, Fair Value | 7,657.2 | 8,506.0
Significant other observable inputs (Level 2) |  |
Liabilities: |  |
Long-term debt, Carrying Value | 51.2 | 51.2
Long-term debt, Fair Value | 64.4 | 67.2
Fair value measurements recurring | Fair value as of the end of the period |  |
Short-term investment: |  |
Trading securities | 406.1 | 486.5
Derivative: |  |
Total assets, fair value | 1,625.3 | 1,651.4
Fair value measurements recurring | Fair value as of the end of the period | Copper |  |
Derivative: |  |
Provisionally priced sales | 950.6 | 876.2
Fair value measurements recurring | Fair value as of the end of the period | Molybdenum |  |
Derivative: |  |
Provisionally priced sales | 268.2 | 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 | 0.2 | 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 | 406.1 | 486.5
Derivative: |  |
Total assets, fair value | 1,624.9 | 1,651.0
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper |  |
Derivative: |  |
Provisionally priced sales | 950.6 | 876.2
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum |  |
Derivative: |  |
Provisionally priced sales | 268.2 | 288.3
Fair value measurements recurring | Significant other observable inputs (Level 2) |  |
Available-for-sale: |  |
Available-for-sale Securities, Current, Total | 0.4 | 0.4
Fair value measurements recurring | Significant other observable inputs (Level 2) | Asset backed securities |  |
Available-for-sale: |  |
Available-for-sale debt securities | 0.2 | 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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