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Other Financial Assets and Liabilities - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
bbl
Dec. 31, 2022
USD ($)
Other financial assets and liabilities [line items]    
Hedging instrument, assets $ 29.3  
Gain (loss) on hedge ineffectiveness recognised in profit or loss $ 15.0 $ 72.0
Oil Swaps [Member]    
Other financial assets and liabilities [line items]    
Oil and gas sale price | bbl 75.7  
Payments for hedge collateral $ 506.0  
Embedded Derivatives [Member] | Financial liabilities at fair value through profit or loss, category [member] | Long Term Sale And Gas Purchase Contract With Perdman [Member]    
Other financial assets and liabilities [line items]    
Gain loss on financial liabilities at fair value through profit or loss 35.0  
Derivative financial liabilities $ 35.0 $ 0.0
Discount rate, measurement input [member] | Top of range [member] | Embedded Derivatives [Member] | Financial liabilities at fair value through profit or loss, category [member] | Long Term Sale And Gas Purchase Contract With Perdman [Member]    
Other financial assets and liabilities [line items]    
Discount rate pre tax 7.12  
Discount rate, measurement input [member] | Bottom of range [member] | Embedded Derivatives [Member] | Financial liabilities at fair value through profit or loss, category [member] | Long Term Sale And Gas Purchase Contract With Perdman [Member]    
Other financial assets and liabilities [line items]    
Discount rate pre tax 5.39  
Inflation Rate [Member] | Embedded Derivatives [Member] | Financial liabilities at fair value through profit or loss, category [member] | Long Term Sale And Gas Purchase Contract With Perdman [Member]    
Other financial assets and liabilities [line items]    
Discount rate pre tax 2.5