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Commitments (Details)
t in Millions, lb in Millions
 12 Months Ended
Dec. 31, 2018
$ / oz
USD ($)
lb
oz
t
Jul. 01, 2018
$ / oz
Antamina    
Commitments    
Attributable payable production of gold to be purchased (as a percent) 0.00%  
Attributable payable production of silver to be purchased (as a percent) 22.50%  
Attributable payable production of platinum group metals to be purchased (as a percent) 0.00%  
Payment for each ounce of silver (as a percent) 5.00%  
Term of agreement 40 years  
Fixed silver payability (as a percent) 90.00%  
Percentage of reduction in spot price after maximum ounces of silver have been delivered under the stream agreement 15.00%  
Maximum ounces of silver on which on-going price of spot price is payable 86,000,000  
Purchase price per ounce of silver as a percent of average or spot price upon initial delivery 5.00%  
Antapaccay    
Commitments    
Attributable payable production of platinum group metals to be purchased (as a percent) 0.00%  
Payment for each ounce of gold (as a percent) 20.00%  
Payment for each ounce of silver (as a percent) 20.00%  
Term of agreement 40 years  
Percentage of reduction in spot price after maximum ounces of silver have been delivered under the stream agreement 30.00%  
Purchase price per ounce of silver as a percent of average or spot price upon initial delivery 20.00%  
Maximum ounces of silver on which on-going price of spot price is payable 12,800,000  
Ounces of gold receivable for each 1,000 tonnes of copper 300  
Copper for 300 ounces of gold 1,000  
Quantity of delivered gold ounces before payable production to be purchased decreases to next threshold from initial threshold 630,000  
Percentage of gold receivable after initial threshold is achieved 30.00%  
Ounces of silver receivable for each 1,l000 tonnes of copper 4,700  
Copper for 4,700 ounces of silver 1,000  
Maximum ounces of silver receivable 10,000,000  
Percentage of spot price of gold on which on-going price is paid 20.00%  
Maximum ounces of gold on which on-going price of spot price is payable 750,000  
Percentage of spot price of gold on which on-going price is paid after maximum ounces have been delivered 30.00%  
Percentage of spot price of silver on which on-going price is paid after maximum ounces have been delivered 30.00%  
Candelaria    
Commitments    
Attributable payable production of gold to be purchased (as a percent) 68.00%  
Attributable payable production of silver to be purchased (as a percent) 68.00%  
Attributable payable production of platinum group metals to be purchased (as a percent) 0.00%  
Payment for each ounce of gold (in dollars per ounce) | $ / oz 400  
Payment for each ounce of silver (in dollars per ounce) | $ / oz 4.00  
Term of agreement 40 years  
Percentage of reduction in spot price after maximum ounces of silver have been delivered under the stream agreement 40.00%  
Maximum ounces of silver on which on-going price of spot price is payable 12,000,000  
Maximum ounces of gold on which on-going price of spot price is payable 720,000  
Cobre Panama Fixed Payment Stream    
Commitments    
Attributable payable production of platinum group metals to be purchased (as a percent) 0.00%  
Payment for each ounce of gold (in dollars per ounce) | $ / oz 418  
Payment for each ounce of silver (in dollars per ounce) | $ / oz 6.27  
Term of agreement 40 years  
Percentage of reduction in spot price after maximum ounces of silver have been delivered under the stream agreement 62.10%  
Percentage of reduction in spot price after maximum ounces of gold have been delivered under the stream agreement 63.40%  
Maximum ounces of silver on which on-going price of spot price is payable 9,842,000  
Maximum ounces of silver on which on-going price of spot price is payable 21,510,000  
Quantity of delivered gold ounces before payable production to be purchased decreases to next threshold from initial threshold 808,000  
Purchase price per ounce of gold per ounce upon delivery initial | $ 406  
Purchase price per ounce of gold per ounce upon delivery initial post inflation adjustment | $ 418.27  
The mill thoughput number of consecutive days of commensurate 30 days  
The annual capacity of tonnes per annum reached by period end. | t 58  
Annual rate of return on upfront payments until the mill throughput is achieved 5.00%  
The reduction of applicable fixed gold price per ounce (in dollar per ounce) | $ / oz 100  
Quantity of delivered gold ounces before purchase decreases to next threshold from initial threshold 1,341,000  
Silver price per ounce of silver per ounce upon delivery initial | $ 6.09  
Purchase price per ounce of silver per ounce upon delivery initial post inflation adjustment | $ 6.27  
Percentage of spot price of gold on which on-going price is paid after maximum ounces have been delivered 50.00%  
Percentage of spot price of silver on which on-going price is paid after maximum ounces have been delivered 50.00%  
Ounces of gold receivable per every 1 million pounds of copper produced 120  
Copper for stated ounces of gold | lb 1  
Copper pounds per gold ounces to purchase threshold 2 81  
Ounces of gold receivable per every 1 million pounds of copper produced | lb 1  
Maximum ounces of gold receivable for second threshold 1,716,188  
Ounces of silver receivable per every 1 million pounds of copper produced 1,376  
Copper for stated ounces of silver | lb 1  
Number of payable Silver ounces to be purchased per quantity of pounds of copper 1,776  
Ounces of silver receivable per every 1 million pounds of copper produced | lb 1  
Ounces Of Silver Delivered Under Threshold 2 Before Committed Quantities Reduces 29,731,000  
Cobre Panama Floating Payment Stream    
Commitments    
Attributable payable production of platinum group metals to be purchased (as a percent) 0.00%  
Payment for each ounce of gold (as a percent) 20.00%  
Payment for each ounce of silver (as a percent) 20.00%  
Term of agreement 40 years  
Percentage of reduction in spot price after maximum ounces of silver have been delivered under the stream agreement 15.53%  
Percentage of reduction in spot price after maximum ounces of gold have been delivered under the stream agreement 15.85%  
Maximum ounces of silver on which on-going price of spot price is payable 2,460,500  
Purchase price per ounce of silver as a percent of average or spot price upon initial delivery 20.00%  
Maximum ounces of silver on which on-going price of spot price is payable 9,618,000  
Quantity of delivered gold ounces before payable production to be purchased decreases to next threshold from initial threshold 202,000  
The mill thoughput number of consecutive days of commensurate 30 days  
The annual capacity of tonnes per annum reached by period end. | t 58  
Annual rate of return on upfront payments until the mill throughput is achieved 5.00%  
The reduction of applicable fixed gold price per ounce (in dollar per ounce) | $ / oz 100  
Percentage of spot price of gold on which on-going price is paid 20.00%  
Maximum ounces of gold on which on-going price of spot price is payable 604,000  
Percentage of spot price of gold on which on-going price is paid after maximum ounces have been delivered 50.00%  
Percentage of spot price of silver on which on-going price is paid after maximum ounces have been delivered 50.00%  
Ounces of gold receivable per every 1 million pounds of copper produced 30  
Copper for stated ounces of gold | lb 1  
Copper pounds per gold ounces to purchase threshold 2 20.25  
Ounces of gold receivable per every 1 million pounds of copper produced | lb 1  
Maximum ounces of gold receivable for second threshold 429,047  
Ounces of silver receivable per every 1 million pounds of copper produced 344  
Copper for stated ounces of silver | lb 1  
Number of payable Silver ounces to be purchased per quantity of pounds of copper 444  
Ounces of silver receivable per every 1 million pounds of copper produced | lb 1  
Ounces Of Silver Delivered Under Threshold 2 Before Committed Quantities Reduces 7,432,750  
Karma    
Commitments    
Attributable payable production of gold to be purchased (as a percent) 4.875%  
Attributable payable production of silver to be purchased (as a percent) 0.00%  
Attributable payable production of platinum group metals to be purchased (as a percent) 0.00%  
Payment for each ounce of gold (as a percent) 20.00%  
Term of agreement 40 years  
Percentage of gold receivable after initial threshold is achieved 4.875%  
Percentage of spot price of gold on which on-going price is paid 20.00%  
Maximum ounces of gold receivable (per annum) 15,000  
Guadalupe-Palmarejo    
Commitments    
Attributable payable production of gold to be purchased (as a percent) 50.00%  
Attributable payable production of silver to be purchased (as a percent) 0.00%  
Attributable payable production of platinum group metals to be purchased (as a percent) 0.00%  
Payment for each ounce of gold (in dollars per ounce) | $ / oz 800  
Term of agreement 40 years  
Sabodala    
Commitments    
Attributable payable production of gold to be purchased (as a percent) 6.00%  
Attributable payable production of silver to be purchased (as a percent) 0.00%  
Attributable payable production of platinum group metals to be purchased (as a percent) 0.00%  
Payment for each ounce of gold (as a percent) 20.00%  
Term of agreement 40 years  
Percentage of gold receivable after initial threshold is achieved 6.00%  
Percentage of spot price of gold on which on-going price is paid 20.00%  
Maximum ounces of gold receivable (per month) 1,875  
MWS    
Commitments    
Attributable payable production of gold to be purchased (as a percent) 25.00%  
Attributable payable production of silver to be purchased (as a percent) 0.00%  
Attributable payable production of platinum group metals to be purchased (as a percent) 0.00%  
Payment for each ounce of gold (in dollars per ounce) | $ / oz 400  
Term of agreement 40 years  
Ounces of gold capped under agreement 312,500  
Cooke 4    
Commitments    
Attributable payable production of gold to be purchased (as a percent) 7.00%  
Attributable payable production of silver to be purchased (as a percent) 0.00%  
Attributable payable production of platinum group metals to be purchased (as a percent) 0.00%  
Payment for each ounce of gold (in dollars per ounce) | $ / oz 400  
Term of agreement 40 years  
Sudbury    
Commitments    
Attributable payable production of gold to be purchased (as a percent) 50.00%  
Attributable payable production of silver to be purchased (as a percent) 0.00%  
Attributable payable production of platinum group metals to be purchased (as a percent) 50.00%  
Payment for each ounce of gold (in dollars per ounce) | $ / oz 400 800
Payment for each ounce of PGM (in dollars per ounce) | $ 400  
Term of agreement 40 years  
Percentage of purchase commitment 50.00%