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INCOME TAXES: - Other (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Income Taxes      
Total cash, cash equivalents and short-term investments $ 3,488.9    
Deferred tax asset 206.1 $ 93.1  
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 $ 214.5
Gross decreases - tax positions in prior period (10.9)   (7.5)
Gross increases - current-period tax positions   7.7  
Gross decreases - current-period tax positions (1.1)   (4.2)
Decreases related to settlements with taxing authorities 54.1   144.4
Increase (decrease) in unrecognized tax benefits (66.1) 7.7 (156.1)
Unrecognized tax benefits, ending balance   66.1 58.4
Amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate $ 0.0    
Number of major tax jurisdictions | item 3    
Foreign subsidiaries      
Income Taxes      
Total cash, cash equivalents and short-term investments $ 1,054.8    
Deferred tax asset 200.0    
Foreign      
Changes in unrecognized tax benefits      
Unrecognized tax benefits, ending balance $ 14.2    
Peru      
Income Taxes      
Royalty charge assessed as a percentage of net sales 1.00%    
Royalty charges $ 140.8 60.6 42.3
Provision for royalty tax 97.8 31.4 14.2
Peruvian special mining tax $ 114.0 50.0 38.1
Changes in unrecognized tax benefits      
Accrued interest and penalties included in liability for uncertain tax positions     $ 10.5
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 $ 75.3    
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