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INCOME TAXES: - Provision (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
U.S. federal and state:      
Current $ 4.6 $ 0.1  
Uncertain tax positions 0.6    
Provision for income taxes 5.2 0.1  
Foreign (Peru and Mexico):      
Current 1,491.0 1,443.1 $ 2,425.5
Deferred (59.1) 118.6 (126.3)
Uncertain tax position 81.8 34.3  
Provision for income taxes 1,513.7 1,596.0 2,299.2
Total provision for income taxes 1,518.9 1,596.1 2,299.2
Earnings by location:      
U.S. 23.3 0.5 (32.4)
Peru 1,151.3 1,167.8 1,962.8
Mexico 2,781.2 3,079.5 3,766.4
Foreign 3,932.5 4,247.3 5,729.2
Income before income taxes $ 3,955.8 $ 4,247.8 $ 5,696.8