XML 83 R59.htm IDEA: XBRL DOCUMENT v3.20.4
Commitments and Contingencies - Narrative (Details)
Dec. 31, 2020
oz
$ / oz
Forward Contracts | Gold, Ounces  
Guarantor Obligations [Line Items]  
Investment contract weight | oz 24,500
Derivative, average forward price | $ / oz 1,840
Minimum  
Guarantor Obligations [Line Items]  
Operating leases term 3 years
Maximum  
Guarantor Obligations [Line Items]  
Operating leases term 5 years