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FAIR VALUE MEASUREMENT: (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Short term investment:    
Trading securities $ 675.3 $ 245.2
Carrying Value    
Liabilities:    
Total long-term debt 6,748.2 5,758.5
Fair Value    
Liabilities:    
Total long-term debt 6,808.9 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 6,697.1 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 6,755.2 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 53.7 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 investment:    
Trading securities 675.3 245.2
Derivative:    
Total assets, fair value 2,079.8 1,109.3
Fair value measurements recurring | Fair Value | Copper    
Derivative:    
Provisionally priced sales 1,050.2 589.5
Fair value measurements recurring | Fair Value | Molybdenum    
Derivative:    
Provisionally priced sales 354.2 274.5
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 investment:    
Trading securities 675.3 245.2
Derivative:    
Total assets, fair value 2,079.7 1,109.2
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper    
Derivative:    
Provisionally priced sales 1,050.2 589.5
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum    
Derivative:    
Provisionally priced sales 354.2 274.5
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