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INCOME TAXES: - Tax assets and liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Assets:      
Inventories $ 28.5 $ 78.0  
Capitalized exploration expenses 12.4 12.5  
U.S. foreign tax credit carryforward, net of Uncertain Tax Positions 1,653.5 1,479.2  
U.S. tax effect of Peruvian deferred tax liability 112.5 75.0  
U.S. tax effect of Peruvian Uncertain Tax Positions 45.1    
Reserves 249.6 284.5  
Property, plant and equipment   9.5  
Deferred workers participation 15.9 11.1  
Accrued salaries, wages and vacations 7.4 8.2  
Sales price adjustment (PUI)   2.6  
Social responsibility expenses   5.1  
Deferred charges 28.6 31.6  
Valuation allowance on U.S. deferred tax assets, foreign tax credits and U.S. tax effect of Peruvian deferred (2,053.7) (1,820.0)  
Accrued royalty and special mining tax 10.8 23.3  
Other 21.9 5.5  
Total deferred tax assets 132.5 206.1  
Liabilities:      
Property, plant and equipment (19.7)    
Social responsibility expenses (7.7)    
Sales price adjustment (PUI) (29.0)    
Other   (8.2)  
Total deferred tax liabilities (56.4) (8.2)  
Total net deferred tax assets 76.1 $ 197.9  
Increase in valuation allowance $ 233.7    
U.S. statutory rate (as a percent) 21.00% 21.00% 21.00%