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INCOME TAXES: - Other (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Income Taxes      
Cash, cash equivalents, restricted cash and short-term investments $ 2,005.8    
Estimated one time transition tax on foreign earnings and profits     $ 8,900.0
U.S. federal income tax 0.0    
State income tax 0.0    
Provisional tax amount     181.1
Reduced tax amount from provisional tax amount   $ 28.0  
Finalized transition tax liability   153.1  
Deferred tax asset 54.0 128.9  
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 214.5 214.5 304.0
Gross increases - tax positions in prior period 7.5   89.5
Gross decreases - current-period tax positions (4.2)    
Decreases related to settlements with taxing authorities 144.4    
Increase (decrease) in unrecognized tax benefits (156.1)   (89.5)
Unrecognized tax benefits, ending balance 58.4 214.5 214.5
Amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate $ 10.5    
Number of major tax jurisdictions | item 3    
Minera Mexico      
Income Taxes      
Earnings available for dividends to United States     555.5
Foreign subsidiaries      
Income Taxes      
Cash, cash equivalents, restricted cash and short-term investments $ 1,106.7    
Deferred tax asset 400.0    
Foreign      
Changes in unrecognized tax benefits      
Unrecognized tax benefits, ending balance $ 58.4    
Peru      
Income Taxes      
Royalty charge assessed as a percentage of net sales 1.00%    
Royalty charges $ 42.3 32.9 23.4
Provision for royalty tax 14.2 9.0 2.5
Peruvian special mining tax 38.1 $ 30.6 23.3
Changes in unrecognized tax benefits      
Accrued interest and penalties included in liability for uncertain tax positions 10.5    
Income tax expected to be paid $ 9.8    
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 on earnings before taxes $ 61.6    
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    
Withholding tax rate on interest 1.04% 0.46%  
Reduction in income tax rate (as a percent)   20.00%  
Reduction in value added tax rate (as a percent)   8.00%  
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   $ 1.9 $ 1.9