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INCOME TAXES: - Other (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2021
USD ($)
Income Taxes        
Total cash, cash equivalents and short-term investments $ 2,594.4      
Deferred tax asset 93.1 $ 54.0    
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 58.4 214.5    
Gross increases - tax positions in prior period   7.5    
Gross increases - current-period tax positions 7.7      
Gross decreases - current-period tax positions   (4.2)    
Decreases related to settlements with taxing authorities   144.4    
Increase (decrease) in unrecognized tax benefits 7.7 (156.1)    
Unrecognized tax benefits, ending balance 66.1 58.4 $ 214.5  
Amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate $ 0.0      
Number of major tax jurisdictions | item 3      
Income tax expected to be paid       $ 0.6
Foreign subsidiaries        
Income Taxes        
Total cash, cash equivalents and short-term investments $ 1,297.3      
Deferred tax asset 200.0      
Foreign        
Changes in unrecognized tax benefits        
Unrecognized tax benefits, ending balance $ 66.1      
Peru        
Income Taxes        
Royalty charge assessed as a percentage of net sales 1.00%      
Royalty charges $ 60.6 42.3 32.9  
Provision for royalty tax 31.4 14.2 9.0  
Peruvian special mining tax $ 50.0 38.1 30.6  
Changes in unrecognized tax benefits        
Accrued interest and penalties included in liability for uncertain tax positions   $ 10.5 $ 1.9  
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 on earnings before taxes $ 60.1      
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 $ 0.9      
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