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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]        
- Borrowings $ 1,526.9 $ 1,845.8    
- Trade and other payables 452.0 385.3    
- Lease liabilities 429.0 332.9 $ 88.6  
- Environmental trust funds 79.3 69.5 60.8  
- Trade and other receivables 240.1 136.0    
- Investments 147.9 155.1    
- Cash and cash equivalents 886.8 515.0 $ 219.7 $ 393.8
- Warrants 12.9 11.7    
Fair Value [member] | Financial liabilities at fair value [member]        
Disclosure of detailed information about financial instruments [line items]        
- Gold and foreign exchange derivative contracts   127.6    
- Copper and oil derivative contracts 29.1      
Total 29.1 127.6    
Fair Value [member] | Financial liabilities not measured at fair value [member]        
Disclosure of detailed information about financial instruments [line items]        
- Borrowings 1,689.8 1,952.4    
- Trade and other payables 452.0 385.3    
- Lease liabilities 429.0 332.9    
Total 2,570.8 2,670.6    
Fair Value [member] | Financial assets at fair value [member]        
Disclosure of detailed information about financial instruments [line items]        
- Gold and foreign exchange derivative contracts 113.3      
- Environmental trust funds 7.4 7.2    
- Trade and other receivables 23.7 22.8    
- Investments 42.4 47.9    
Asanko redeemable preference shares 92.6 95.5    
- Warrants 12.9 11.7    
- Oil derivative contracts   1.1    
Total 292.3 186.2    
Fair Value [member] | Financial assets not measured at fair value [member]        
Disclosure of detailed information about financial instruments [line items]        
- Environmental trust funds 71.9 62.3    
- Loan advanced - contractor 68.4      
- Trade and other receivables 29.5 51.4    
- Cash and cash equivalents 886.8 515.0    
Total 1,056.6 628.7    
Carrying amount [member] | Financial liabilities at fair value [member]        
Disclosure of detailed information about financial instruments [line items]        
- Gold and foreign exchange derivative contracts   127.6    
- Copper and oil derivative contracts 29.1      
Total 29.1 127.6    
Carrying amount [member] | Financial liabilities at fair value [member] | Fair value through profit or loss [member]        
Disclosure of detailed information about financial instruments [line items]        
- Gold and foreign exchange derivative contracts   127.6    
- Copper and oil derivative contracts 29.1      
Total 29.1 127.6    
Carrying amount [member] | Financial liabilities not measured at fair value [member]        
Disclosure of detailed information about financial instruments [line items]        
- Borrowings 1,526.9 1,845.8    
- Trade and other payables 452.0 385.3    
- Lease liabilities 429.0 332.9    
Total 2,407.9 2,564.0    
Carrying amount [member] | Financial liabilities not measured at fair value [member] | Other financial liabilities measured at amortised cost, category [member]        
Disclosure of detailed information about financial instruments [line items]        
- Borrowings 1,526.9 1,845.8    
- Trade and other payables 452.0 385.3    
- Lease liabilities 429.0 332.9    
Total 2,407.9 2,564.0    
Carrying amount [member] | Financial assets at fair value [member]        
Disclosure of detailed information about financial instruments [line items]        
- Gold and foreign exchange derivative contracts 113.3      
- Environmental trust funds 7.4 7.2    
- Trade and other receivables 23.7 22.8    
- Investments 42.4 47.9    
Asanko redeemable preference shares 92.6 95.5    
- Warrants 12.9 11.7    
- Oil derivative contracts   1.1    
Total 292.3 186.2    
Carrying amount [member] | Financial assets at fair value [member] | Fair value through profit or loss [member]        
Disclosure of detailed information about financial instruments [line items]        
- Gold and foreign exchange derivative contracts 113.3      
- Environmental trust funds 7.4 7.2    
- Trade and other receivables 23.7 22.8    
- Warrants 12.9 11.7    
- Oil derivative contracts   1.1    
Total 157.3 42.8    
Carrying amount [member] | Financial assets at fair value [member] | FVOCI [member]        
Disclosure of detailed information about financial instruments [line items]        
- Investments 42.4 47.9    
Asanko redeemable preference shares 92.6 95.5    
Total 135.0 143.4    
Carrying amount [member] | Financial assets not measured at fair value [member]        
Disclosure of detailed information about financial instruments [line items]        
- Environmental trust funds 71.9 62.3    
- Loan advanced - contractor 68.4      
- Trade and other receivables 29.5 51.4    
- Cash and cash equivalents 886.8 515.0    
Total 1,056.6 628.7    
Carrying amount [member] | Financial assets not measured at fair value [member] | Amortised cost [member]        
Disclosure of detailed information about financial instruments [line items]        
- Environmental trust funds 71.9 62.3    
- Trade and other receivables 29.5 51.4    
- Cash and cash equivalents 886.8 515.0    
Total 1,056.6 $ 628.7    
Carrying amount [member] | Financial assets at amortised cost, class [member] | Financial liabilities not measured at fair value [member]        
Disclosure of detailed information about financial instruments [line items]        
- Loan advanced - contractor $ 68.4