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FAIR VALUE MEASUREMENT: (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Short-term investment:    
Trading securities $ 318.6 $ 599.1
Available-for-sale:    
Available-for-sale Securities, Current, Total 0.2 0.2
Carrying Value    
Liabilities:    
Long-term debt, Carrying Value 5,757.8  
Long-term debt, Fair Value   6,254.6
Fair Value    
Liabilities:    
Long-term debt, Fair Value 6,076.6 6,485.9
Quoted prices in active markets for identical assets (Level 1) | Carrying Value    
Liabilities:    
Current portion of long term debt 499.6  
Non current portion of long term debt 5,706.6 6,203.4
Quoted prices in active markets for identical assets (Level 1) | Fair Value    
Liabilities:    
Current portion of long term debt 497.6  
Non current portion of long term debt 6,021.0 6,431.9
Significant other observable inputs (Level 2) | Carrying Value    
Liabilities:    
Non current portion of long term debt 51.2 51.2
Significant other observable inputs (Level 2) | Fair Value    
Liabilities:    
Non current portion of long term debt 55.6 54.0
Fair value measurements recurring    
Short-term investment:    
Trading securities 318.6  
Derivative:    
Total assets, fair value 1,373.4  
Fair value measurements recurring | Copper    
Derivative:    
Provisionally priced sales 681.8  
Fair value measurements recurring | Molybdenum    
Derivative:    
Provisionally priced sales 372.9  
Fair value measurements recurring | Fair Value    
Short-term investment:    
Trading securities   599.1
Derivative:    
Total assets, fair value   1,521.7
Fair value measurements recurring | Fair Value | Copper    
Derivative:    
Provisionally priced sales   657.5
Fair value measurements recurring | Fair Value | Molybdenum    
Derivative:    
Provisionally priced sales   264.9
Fair value measurements recurring | Asset backed securities | Fair Value    
Available-for-sale:    
Available-for-sale debt securities   0.1
Fair value measurements recurring | Asset backed securities | Fair Value | Maximum    
Available-for-sale:    
Available-for-sale debt securities 0.1  
Fair value measurements recurring | Mortgage backed securities    
Available-for-sale:    
Available-for-sale debt securities 0.1  
Fair value measurements recurring | Mortgage backed securities | Fair Value    
Available-for-sale:    
Available-for-sale debt securities   0.1
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1)    
Short-term investment:    
Trading securities 318.6 599.1
Derivative:    
Total assets, fair value 1,373.3 1,521.5
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper    
Derivative:    
Provisionally priced sales 681.8 657.5
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum    
Derivative:    
Provisionally priced sales 372.9 264.9
Fair value measurements recurring | Significant other observable inputs (Level 2)    
Available-for-sale:    
Available-for-sale Securities, Current, Total 0.2 0.2
Fair value measurements recurring | Significant other observable inputs (Level 2) | Asset backed securities    
Available-for-sale:    
Available-for-sale debt securities   0.1
Fair value measurements recurring | Significant other observable inputs (Level 2) | Asset backed securities | Maximum    
Available-for-sale:    
Available-for-sale debt securities 0.1  
Fair value measurements recurring | Significant other observable inputs (Level 2) | Mortgage backed securities    
Available-for-sale:    
Available-for-sale debt securities $ 0.1 $ 0.1