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Equity-Accounted Investees - Summary of Equity-Accounted Investees (Detail) - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2016
Disclosure of equity-accounted investees [line items]        
Non-current assets $ 5,713.0 $ 5,460.2    
Current assets 1,730.4 1,069.9    
Non-current liabilities (2,728.1) (2,284.8)    
Current liabilities (916.5) (1,367.8)    
Consideration paid for equity portion     $ 165.0  
Gain on acquisition 0.0 0.0 51.8  
Carrying amount of interest in joint venture 233.3 172.0    
Revenue 3,892.1 2,967.1 2,577.8  
Total equity-accounted investees 233.3 172.0    
Total share of results of equity-accounted investees after taxation (2.6) 3.1 (13.1)  
Depreciation and amortisation (661.3) (610.0) (668.4)  
Other expenses (11.5) (67.6) (44.8)  
Royalties (105.0) (73.7) (62.5)  
Profit for the year before impairment 745.4 174.7 (344.8)  
Profit on disposal (0.2) 1.2 $ (51.6)  
FSE [member]        
Disclosure of equity-accounted investees [line items]        
Share of accumulated losses brought forward (93.6) (92.2)    
Carrying amount of interest in joint venture $ 144.4 $ 82.1    
Interest on joint venture 40.00% 40.00% 40.00%  
Total share of results of equity-accounted investees after taxation $ (1.6) $ (1.4) $ (12.9)  
Asanko Gold [member]        
Disclosure of equity-accounted investees [line items]        
Non-current assets 392.9 474.6    
Initial investment at cost 86.9 86.9    
Current assets 170.6 120.0    
Non-current liabilities (71.8) (79.4)    
Current liabilities (109.7) (62.2)    
Net assets 382.0 453.0    
Less: Shika redeemable preference shares (196.4) (271.4)    
Net assets attributable to owners of the parent 185.6 181.6    
Group's share of net assets 88.9 89.9    
Cash consideration paid 165.0 165.0    
Less: consideration allocated to the redeemable preference shares (129.9) (129.9)    
Consideration paid for equity portion 35.1 35.1    
Gain on acquisition 51.8 51.8    
Share of accumulated losses brought forward 3.0 (1.1)    
Share of profit after taxation before impairment 48.5 4.1    
Impairment (49.5)      
Carrying amount of interest in joint venture 88.9 89.9    
Revenue 418.1 341.0    
Production costs (222.5) (199.2)    
Asanko Gold - earnings 48.5 4.1 (1.1)  
Asanko Gold - impairment (49.5)      
Depreciation and amortisation (50.9) (95.4)    
Other expenses (16.0) (20.1)    
Royalties (20.9) (17.2)    
Profit for the year before impairment 107.8 9.1    
Group share of profit before impairment 48.5 4.1    
Group's share of total comprehensive income after impairment (1.0) 4.1    
Groups share of impairment $ (49.5)      
Marverix Metals Incorporated [member]        
Disclosure of equity-accounted investees [line items]        
Total share of results of equity-accounted investees after taxation   0.4 0.9  
The sale of the shares raised   66.8    
Profit on disposal   $ 14.6 $ 4.0 $ 48.0
Common shares 4,125 4,125   10,000
Percentage of ownership on diluted basis   3.68%