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Risk Management Activities - Summary of the Exposure to Credit Risk for Trade Receivables by Geographic Region (Detail) - Credit risk - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Credit Risk Exposure For Trade Receivables [line items]    
Total trade receivables $ 48.3 $ 69.9
Ghana    
Disclosure Of Credit Risk Exposure For Trade Receivables [line items]    
Total trade receivables 18.7 15.4
Australia    
Disclosure Of Credit Risk Exposure For Trade Receivables [line items]    
Total trade receivables 0.0 28.7
Peru    
Disclosure Of Credit Risk Exposure For Trade Receivables [line items]    
Total trade receivables $ 29.6 $ 25.8