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LEASES: (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Leases    
Lessee, operating lease, option to extend false  
Lessee, operating lease, option to terminate false  
The weighted average remaining lease term 6 years  
The weighted average discount rate 4.92%  
Total lease expense $ 57.7 $ 48.8
Maturities of lease liabilities    
2025 57.7  
2026 115.1  
2027 114.6  
2028 114.0  
2029 112.9  
After 2029 317.3  
Total lease payments 831.5  
Less: interest on lease liabilities (130.9)  
Present value of lease payments 700.7  
Cost of sales (exclusive of depreciation, amortization and depletion)    
Leases    
Total lease expense 57.6 48.7
Exploration    
Leases    
Total lease expense $ 0.1 0.1
Minimum    
Leases    
Remaining lease terms 1 year  
Maximum    
Leases    
Remaining lease terms 8 years  
Maximum | Selling, general and administrative    
Leases    
Total lease expense $ 0.1 $ 0.1