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Financial Instruments - Summary of Carrying Amounts and Fair Values of Financial Assets and Financial Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of changes in fair value measurement, liabilities [abstract]        
– Environmental trust funds $ 109.6 $ 98.8 $ 88.1  
– Trade and other receivables 251.4 198.0    
– Investments 205.9 112.1    
Cash and cash equivalents 648.7 769.4 524.7 $ 886.8
Windfall Project – contingent and exploration considerations 245.4 0.0    
Trade and other payables 643.9 600.7    
– Borrowings 1,236.5 1,079.3    
– Lease liabilities 436.4 394.2 $ 415.5  
Financial liabilities measured at fair value | C$300.0 million contingent consideration – initial fair value        
Reconciliation of changes in fair value measurement, liabilities [abstract]        
Windfall Project – contingent and exploration considerations 202.5 0.0    
Financial liabilities not measured at fair value        
Reconciliation of changes in fair value measurement, liabilities [abstract]        
– Borrowings 1,249.9 1,089.6    
Carrying amount | Financial liabilities measured at fair value        
Reconciliation of changes in fair value measurement, liabilities [abstract]        
Total 202.5      
Carrying amount | Financial liabilities measured at fair value | C$300.0 million contingent consideration – initial fair value        
Reconciliation of changes in fair value measurement, liabilities [abstract]        
Windfall Project – contingent and exploration considerations 202.5      
Carrying amount | Financial liabilities measured at fair value | C$75.0 million exploration consideration – initial present value        
Reconciliation of changes in fair value measurement, liabilities [abstract]        
Windfall Project – contingent and exploration considerations 42.9      
Carrying amount | Financial liabilities measured at fair value | Fair value through profit or loss        
Reconciliation of changes in fair value measurement, liabilities [abstract]        
Total 202.5      
Carrying amount | Financial liabilities measured at fair value | Fair value through profit or loss | C$300.0 million contingent consideration – initial fair value        
Reconciliation of changes in fair value measurement, liabilities [abstract]        
Windfall Project – contingent and exploration considerations 202.5      
Carrying amount | Financial liabilities measured at fair value | Other financial liabilities measured at amortised cost | C$75.0 million exploration consideration – initial present value        
Reconciliation of changes in fair value measurement, liabilities [abstract]        
Windfall Project – contingent and exploration considerations 42.9      
Carrying amount | Financial liabilities not measured at fair value        
Reconciliation of changes in fair value measurement, liabilities [abstract]        
Trade and other payables 532.4      
– Borrowings 1,236.5      
– Lease liabilities 436.4      
Total 2,248.2      
Carrying amount | Financial liabilities not measured at fair value | Other financial liabilities measured at amortised cost        
Reconciliation of changes in fair value measurement, liabilities [abstract]        
Trade and other payables 532.4 501.2    
– Borrowings 1,236.5 1,079.3    
– Lease liabilities 436.4 394.2    
Total 2,248.2 1,974.7    
Carrying amount | Financial assets measured at fair value        
Reconciliation of changes in fair value measurement, liabilities [abstract]        
– Environmental trust funds   2.9    
– Trade and other receivables 18.2 29.6    
– Investments 65.7 34.5    
– Asanko redeemable preference shares 99.7 60.3    
Total 183.6 127.3    
Carrying amount | Financial assets measured at fair value | Fair value through profit or loss        
Reconciliation of changes in fair value measurement, liabilities [abstract]        
– Environmental trust funds   2.9    
– Trade and other receivables 18.2 29.6    
Total 18.2 32.5    
Carrying amount | Financial assets measured at fair value | Fair value through OCI        
Reconciliation of changes in fair value measurement, liabilities [abstract]        
– Investments 65.7 34.5    
– Asanko redeemable preference shares 99.7 60.3    
Total 165.4 94.8    
Carrying amount | Financial assets not measured at fair value        
Reconciliation of changes in fair value measurement, liabilities [abstract]        
– Environmental trust funds 109.6 95.9    
– Trade and other receivables 73.3 42.2    
Loan advanced – contractor   23.4    
Cash and cash equivalents 648.7 769.4    
Total 831.6 930.9    
Carrying amount | Financial assets not measured at fair value | Financial assets measured at amortised cost        
Reconciliation of changes in fair value measurement, liabilities [abstract]        
– Environmental trust funds 109.6 95.9    
– Trade and other receivables 73.3 42.2    
Loan advanced – contractor   23.4    
Cash and cash equivalents 648.7 769.4    
Total 831.6 930.9    
Fair value | Financial liabilities measured at fair value        
Reconciliation of changes in fair value measurement, liabilities [abstract]        
Total 202.5      
Fair value | Financial liabilities measured at fair value | C$300.0 million contingent consideration – initial fair value        
Reconciliation of changes in fair value measurement, liabilities [abstract]        
Windfall Project – contingent and exploration considerations 202.5      
Fair value | Financial liabilities measured at fair value | C$75.0 million exploration consideration – initial present value        
Reconciliation of changes in fair value measurement, liabilities [abstract]        
Windfall Project – contingent and exploration considerations 42.9      
Fair value | Financial liabilities not measured at fair value        
Reconciliation of changes in fair value measurement, liabilities [abstract]        
Trade and other payables 532.4      
– Borrowings 1,249.9      
– Lease liabilities 436.4      
Total 2,261.6      
Fair value | Financial liabilities not measured at fair value | Other financial liabilities measured at amortised cost        
Reconciliation of changes in fair value measurement, liabilities [abstract]        
Trade and other payables   501.2    
– Borrowings   1,089.6    
– Lease liabilities   394.2    
Total   1,985.0    
Fair value | Financial assets measured at fair value        
Reconciliation of changes in fair value measurement, liabilities [abstract]        
– Environmental trust funds   2.9    
– Trade and other receivables 18.2 29.6    
– Investments 65.7 34.5    
– Asanko redeemable preference shares 99.7 60.3    
Total 183.6 127.3    
Fair value | Financial assets not measured at fair value        
Reconciliation of changes in fair value measurement, liabilities [abstract]        
– Environmental trust funds 109.6 95.9    
– Trade and other receivables 73.3 42.2    
Loan advanced – contractor   23.4    
Cash and cash equivalents 648.7 769.4    
Total $ 831.6 $ 930.9