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INCOME TAXES: - Tax assets and liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Assets:      
Inventories $ 78.0 $ 62.4  
Capitalized exploration expenses 12.5 13.0  
U.S. foreign tax credit carryforward, net of FIN 48 liability 1,479.2 974.1  
U.S. tax effect of Peruvian deferred tax liability 75.0 111.2  
Provisions 284.5 169.5  
Property, plant and equipment 9.5    
Deferred workers participation 11.1 37.8  
Accrued salaries, wages and vacations 8.2 8.5  
Sales price adjustment (PUI) 2.6 (5.8)  
Social responsibility expenses 5.1 4.3  
Deferred charges 31.6 41.8  
Valuation allowance on U.S. deferred tax assets, foreign tax credits and U.S. tax effect on Peruvian deferred (1,820.0) (1,343.2)  
Accrued royalty and special mining tax 23.3 18.3  
Other 5.5 1.2  
Total deferred tax assets 206.1 93.1  
Liabilities:      
Property, plant and equipment   (17.2)  
Other (8.2) (5.3)  
Total deferred tax liabilities (8.2) (22.5)  
Total net deferred tax assets $ 197.9 70.6  
Increase in valuation allowance   $ 476.8  
U.S. statutory rate (as a percent) 21.00% 21.00% 21.00%