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Risk Management Activities - Summary of the Exposure to Credit Risk for Trade Receivables by Geographic Region (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Credit Risk Exposure For Trade Receivables [line items]    
Total trade receivables $ 69.9 $ 40.7
Credit risk    
Disclosure Of Credit Risk Exposure For Trade Receivables [line items]    
Total trade receivables 69.9 40.7
Credit risk | Ghana    
Disclosure Of Credit Risk Exposure For Trade Receivables [line items]    
Total trade receivables 15.4 14.3
Credit risk | Australia    
Disclosure Of Credit Risk Exposure For Trade Receivables [line items]    
Total trade receivables 28.7 2.7
Credit risk | Peru    
Disclosure Of Credit Risk Exposure For Trade Receivables [line items]    
Total trade receivables $ 25.8 $ 23.7