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INCOME TAXES: (Details 5)
PEN in Millions, $ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2015
USD ($)
Dec. 31, 2015
PEN
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
PEN
Dec. 31, 2014
USD ($)
Dec. 31, 2013
PEN
Dec. 31, 2013
USD ($)
Income Taxes              
Cash, cash equivalents, restricted cash and short-term investments     $ 882.2        
Income tax rate ( as a percent)   35.00% 35.00% 35.00% 35.00% 35.00% 35.00%
Changes in unrecognized tax benefits              
Unrecognized tax benefits, opening balance     $ 319.4   $ 221.2   $ 221.2
Gross increases tax positions in prior period     36.3   55.1    
Gross increases current-period tax positions     44.3   43.1    
Increase (decrease) in unrecognized tax benefits     80.6   98.2    
Unrecognized tax benefits, ending balance     400.0   319.4   $ 221.2
Amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate     400.0   319.4    
Accrued interest and penalties included in liability for uncertain tax positions     $ 1.9   $ 0.0    
Number of major tax jurisdictions | item     3        
Foreign subsidiaries              
Income Taxes              
Cash, cash equivalents, restricted cash and short-term investments     $ 22.6        
Income tax rate ( as a percent)   10.00% 10.00%        
Foreign              
Changes in unrecognized tax benefits              
Unrecognized tax benefits, ending balance     $ 393.3        
Peru              
Income Taxes              
Income tax rate ( as a percent)   28.00% 28.00% 30.00% 30.00% 30.00% 30.00%
Increase in special mining tax rate for each 5% increase up to 85% increase in operating income margin (as a percent)   0.40% 0.40%        
Peruvian special mining tax     $ 18.1   $ 35.3   $ 25.5
Dividend tax rate       4.10% 4.10%    
Royalty charge assessed as a percentage of net sales   1.00% 1.00%        
Increase in royalty tax rate for each 5% increase up to 12% increase in operating income margin (as a percent)   0.75% 0.75%        
Royalty charges | PEN   PEN 22.9   PEN 32.4   PEN 34.8  
Provision for royalty tax     $ 2.7   $ 7.5    
Changes in unrecognized tax benefits              
Amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate     $ 0.0        
Peru | 2015 - 2016              
Income Taxes              
Income tax rate ( as a percent)   28.00% 28.00%        
Dividend tax rate   6.80% 6.80%        
Peru | 2017 - 2018              
Income Taxes              
Income tax rate ( as a percent)   27.00% 27.00%        
Dividend tax rate   8.00% 8.00%        
Peru | 2019 and later              
Income Taxes              
Income tax rate ( as a percent)   26.00% 26.00%        
Dividend tax rate   9.30% 9.30%        
Peru | Minimum              
Income Taxes              
Special mine tax (as a percent)   2.00% 2.00%        
Operating income margin (as a percent)   2.00% 2.00%        
Increment in operating income margin (as a percent)   5.00% 5.00%        
Mining royalty tax (as a percent)   1.00% 1.00%        
Increment in operating income margin for royalty tax (as a percent)   5.00% 5.00%        
Peru | Maximum              
Income Taxes              
Special mine tax (as a percent)   8.40% 8.40%        
Operating income margin (as a percent)   10.00% 10.00%        
Increment in operating income margin (as a percent)   85.00% 85.00%        
Mining royalty tax (as a percent)   12.00% 12.00%        
Increment in operating income margin for royalty tax (as a percent)   10.00% 10.00%        
United States | Minimum | Minera Mexico              
Income Taxes              
Excess of financial reporting over tax basis for stock in subsidiary     $ 5,900.0        
Mexico              
Income Taxes              
Income tax rate ( as a percent)   30.00% 30.00% 30.00% 30.00% 30.00% 30.00%
Mining royalty tax (as a percent)   7.50% 7.50%        
Additional royalty tax over gross income from sales of gold, silver and platinum (as a percent)   0.50% 0.50%        
Mining royalty amount on earnings before taxes     $ 49.5        
Additional royalty over sales revenue from gold, silver and platinum     0.8        
Amount paid for cancellation of the consolidation regime $ 0.5            
Income tax payable due to tax consolidation     5.6        
Changes in unrecognized tax benefits              
Unrecognized tax benefits, ending balance     $ 0.0