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INCOME TAXES: - Other (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
item
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2019
USD ($)
Income Taxes          
Total cash, cash equivalents and short-term investments $ 2,278.0        
Deferred tax asset 132.5 $ 206.1      
State income tax liability 0.0        
Withholding taxes due to the tax treaty between the United States and Mexico 0.0        
Changes in unrecognized tax benefits          
Unrecognized tax benefits, opening balance   66.1 $ 58.4    
Gross decreases - tax positions in prior period   (10.9)      
Gross increases - tax positions in prior period 130.9        
Gross decreases - current-period tax positions (10.7) (1.1) (7.7)    
Decreases related to settlements with taxing authorities (37.5) (54.1)      
Increase (decrease) in unrecognized tax benefits 82.7 (66.1) 7.7    
Unrecognized tax benefits, ending balance 82.7   66.1    
Amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate $ 65.5        
Number of major tax jurisdictions | item 3        
Foreign subsidiaries          
Income Taxes          
Total cash, cash equivalents and short-term investments $ 903.6        
Deferred tax asset 300.0        
Foreign          
Changes in unrecognized tax benefits          
Unrecognized tax benefits, ending balance $ 17.2        
Peru          
Income Taxes          
Royalty charge assessed as a percentage of net sales 1.00%        
Royalty charges $ 71.4 140.8 60.6    
Provision for royalty tax 35.8 97.8 31.4    
Peruvian special mining tax 56.4 114.0 $ 50.0    
Changes in unrecognized tax benefits          
Unrecognized tax benefits, ending balance 38.8        
Accrued interest and penalties included in liability for uncertain tax positions $ 26.7       $ 26.7
Peru | Forecast          
Changes in unrecognized tax benefits          
Income tax expected to be paid       $ 24.8  
Peru | Minimum          
Income Taxes          
Mining royalty tax (as a percent) 1.00%        
Special mine tax (as a percent) 2.00%        
Peru | Maximum          
Income Taxes          
Mining royalty tax (as a percent) 12.00%        
Special mine tax (as a percent) 8.40%        
Mexico          
Income Taxes          
Mining royalty tax (as a percent) 7.50%        
Additional royalty tax over gross income from sales of gold, silver and platinum (as a percent) 0.50%        
Additional royalty over sales revenue from gold, silver and platinum $ 1.5        
Changes in unrecognized tax benefits          
Unrecognized tax benefits, ending balance 0.0        
United States          
Changes in unrecognized tax benefits          
Accrued interest and penalties included in liability for uncertain tax positions $ 0.0 $ 0.0