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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, 2023
Dec. 31, 2022
Disclosure Of Credit Risk Exposure For Trade Receivables [line items]    
Total trade receivables $ 61.0 $ 48.3
Ghana    
Disclosure Of Credit Risk Exposure For Trade Receivables [line items]    
Total trade receivables 1.5 18.7
Australia    
Disclosure Of Credit Risk Exposure For Trade Receivables [line items]    
Total trade receivables 41.3 0.0
Peru    
Disclosure Of Credit Risk Exposure For Trade Receivables [line items]    
Total trade receivables $ 18.2 $ 29.6