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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]        
– Environmental trust funds $ 88.1 $ 79.3 $ 69.5  
– Trade and other receivables 263.7 240.1    
– Investments 138.6 147.9    
Cash and cash equivalents 524.7 886.8 515.0 $ 219.7
– Warrants 0.0 12.9    
– Borrowings 1,078.1 1,526.9    
– Trade and other payables 480.5 452.0    
– Lease liabilities 415.5 429.0 $ 332.9  
Carrying amount | Financial liabilities measured at fair value        
Disclosure of detailed information about financial instruments [line items]        
- Gold and foreign exchange derivative contracts 6.8 29.1    
Total 6.8 29.1    
Carrying amount | Financial liabilities measured at fair value | Fair value through profit or loss        
Disclosure of detailed information about financial instruments [line items]        
- Gold and foreign exchange derivative contracts 6.8 29.1    
Carrying amount | Financial liabilities not measured at fair value        
Disclosure of detailed information about financial instruments [line items]        
– Borrowings 1,078.1 1,526.9    
– Trade and other payables 480.5 452.0    
– Lease liabilities 415.5 429.0    
Total 1,974.1 2,407.9    
Carrying amount | Financial liabilities not measured at fair value | Other financial liabilities measured at amortised cost        
Disclosure of detailed information about financial instruments [line items]        
– Borrowings 1,078.1 1,526.9    
– Trade and other payables 480.5 452.0    
– Lease liabilities 415.5 429.0    
Total 1,974.1 2,407.9    
Carrying amount | Financial assets measured at fair value        
Disclosure of detailed information about financial instruments [line items]        
– Environmental trust funds 2.9 7.4    
– Trade and other receivables 25.8 23.7    
– Investments 30.9 42.4    
– Asanko redeemable preference shares 94.5 92.6    
– Oil derivatives contracts 5.1 113.3    
Total 159.2 292.3    
– Warrants   12.9    
Carrying amount | Financial assets measured at fair value | Fair value through profit or loss        
Disclosure of detailed information about financial instruments [line items]        
– Environmental trust funds 2.9 7.4    
– Trade and other receivables 25.8 23.7    
– Oil derivatives contracts 5.1 113.3    
Total 33.8 157.3    
– Warrants   12.9    
Carrying amount | Financial assets measured at fair value | Fair value through OCI        
Disclosure of detailed information about financial instruments [line items]        
– Investments 30.9 42.4    
– Asanko redeemable preference shares 94.5 92.6    
Total 125.4 135.0    
Carrying amount | Financial assets not measured at fair value        
Disclosure of detailed information about financial instruments [line items]        
– Environmental trust funds 85.2 71.9    
– Trade and other receivables 56.5 29.5    
– Loan advanced - contractor 27.3 68.4    
Cash and cash equivalents 524.7 886.8    
Total 693.7 1,056.6    
Carrying amount | Financial assets not measured at fair value | Financial assets measured at amortised cost        
Disclosure of detailed information about financial instruments [line items]        
– Environmental trust funds 85.2 71.9    
– Trade and other receivables 56.5 29.5    
– Loan advanced - contractor 27.3 68.4    
Cash and cash equivalents 524.7 886.8    
Total 693.7 1,056.6    
Fair value | Financial liabilities measured at fair value        
Disclosure of detailed information about financial instruments [line items]        
- Gold and foreign exchange derivative contracts 6.8 29.1    
Total 6.8 29.1    
Fair value | Financial liabilities not measured at fair value        
Disclosure of detailed information about financial instruments [line items]        
– Borrowings 1,191.6 1,689.8    
– Trade and other payables 480.5 452.0    
– Lease liabilities 415.5 429.0    
Total 2,087.6 2,570.8    
Fair value | Financial assets measured at fair value        
Disclosure of detailed information about financial instruments [line items]        
– Environmental trust funds 2.9 7.4    
– Trade and other receivables 25.8 23.7    
– Investments 30.9 42.4    
– Asanko redeemable preference shares 94.5 92.6    
– Oil derivatives contracts 5.1 113.3    
Total 159.2 292.3    
– Warrants   12.9    
Fair value | Financial assets not measured at fair value        
Disclosure of detailed information about financial instruments [line items]        
– Environmental trust funds 85.2 71.9    
– Trade and other receivables 56.5 29.5    
– Loan advanced - contractor 27.3 68.4    
Cash and cash equivalents 524.7 886.8    
Total $ 693.7 $ 1,056.6