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LEASES: (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Leases    
Lessee, operating lease, option to extend false  
Lessee, operating lease, option to terminate false  
The weighted average remaining lease term 7 years  
The weighted average discount rate 3.92%  
Total lease expense $ 28.5 $ 29.1
Maturities of lease liabilities    
2024 87.3  
2025 105.9  
2026 105.6  
2027 105.2  
2028 104.9  
After 2028 417.2  
Total lease payments 926.1  
Less: interest on lease liabilities (169.0)  
Present value of lease payments 757.1  
Cost of sales (exclusive of depreciation, amortization and depletion)    
Leases    
Total lease expense $ 28.5 $ 29.1
Minimum    
Leases    
Remaining lease terms 1 year  
Maximum    
Leases    
Remaining lease terms 9 years  
Maximum | Exploration    
Leases    
Total lease expense $ 0.1