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INCOME TAXES: - Other (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
item
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2024
USD ($)
INCOME TAXES        
Total cash, cash equivalents and short-term investments $ 1,750.8      
Deferred tax asset 204.6 $ 132.5    
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 56.0   $ 66.1  
Gross decreases - tax positions in prior period     (10.9)  
Gross increases - tax positions in prior period 50.2 104.2    
Gross increases - current-period tax positions 8.6      
Gross decreases - current-period tax positions   (10.7) (1.1)  
Decreases related to settlements with taxing authorities (15.7) (37.5) (54.1)  
Lapse in statute of Limitations 10.8      
Foreign Currency Effects 1.1      
Increase (decrease) in unrecognized tax benefits 55.0 56.0 (66.1)  
Unrecognized tax benefits, ending balance 111.0 56.0    
Amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate $ 99.3      
New taxes or tax rate increases | item 0      
Number of major tax jurisdictions | item 3      
Unrecognized Tax Benefits $ 111.0 56.0    
Foreign subsidiaries        
INCOME TAXES        
Total cash, cash equivalents and short-term investments 512.2      
Deferred tax asset 100.0      
Foreign        
Changes in unrecognized tax benefits        
Unrecognized tax benefits, ending balance 11.7      
Unrecognized Tax Benefits $ 11.7      
Peru        
INCOME TAXES        
Royalty charge assessed as a percentage of net sales 1.00%      
Royalty charges $ 84.8 71.4 140.8  
Provision for royalty tax 44.6 35.8 97.8  
Peruvian special mining tax 71.7 56.4 $ 114.0  
Changes in unrecognized tax benefits        
Unrecognized tax benefits, ending balance 46.4      
Accrued interest and penalties included in liability for uncertain tax positions 19.7 26.7    
Unrecognized Tax Benefits $ 46.4      
Peru | Forecast        
Changes in unrecognized tax benefits        
Income tax expected to be paid       $ 67.8
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%      
Mining royalty amount $ 142.8      
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      
Accrued interest and penalties included in liability for uncertain tax positions 0.0 $ 0.0    
Unrecognized Tax Benefits 0.0      
United States        
Changes in unrecognized tax benefits        
Unrecognized tax benefits, ending balance 0.2      
Accrued interest and penalties included in liability for uncertain tax positions 0.2      
Unrecognized Tax Benefits $ 0.2