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Equity-Accounted Investees - Summary of Equity-Accounted Investees (Detail) - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Mar. 29, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Disclosure of equity-accounted investees [line items]            
Non-current assets   $ 5,460.2 $ 5,183.2 [1]     $ 5,505.7
Current assets   1,069.9 726.5 [1]     959.1
Non-current liabilities   (2,284.8) (2,670.9) [1]     (2,363.1)
Current liabilities   (1,367.8) (531.9) [1]     $ (738.7)
Consideration paid for equity portion     165.0      
Gain on acquisition   0.0 51.8 [1] $ 0.0 [1]    
Carrying amount of interest in joint venture   172.0 177.5      
Revenue   2,967.1 2,577.8 2,761.8    
Total equity-accounted investees   172.0 225.1      
Total share of results of equity-accounted investees after taxation   3.1 (13.1) (1.3)    
Depreciation and amortisation   (610.0) (668.4) (748.1)    
Other expenses   (67.6) (44.8) (19.0)    
Royalties [1]   (73.7) (62.5) (62.0)    
Income tax expense   (175.6) 65.9 [1] (173.2) [1]    
Profit/(loss) for the year   174.7 (344.8) (7.7)    
Other comprehensive income   54.3 (330.0) 279.2    
Total comprehensive income   229.0 (674.8) 271.5    
Profit on disposal   1.2 (51.6) 4.0    
Asanko Gold Ghana Limited [member]            
Disclosure of equity-accounted investees [line items]            
Interest on joint venture 45.00%          
Total share of results of equity-accounted investees after taxation   4.1 (1.1) $ 0.0    
Shika Group Finance Limited [member]            
Disclosure of equity-accounted investees [line items]            
Interest on joint venture 50.00%          
Adansi Gold Company Ghana Limited [member]            
Disclosure of equity-accounted investees [line items]            
Interest on joint venture 50.00%          
Far Southeast Gold Resources Incorporated [member]            
Disclosure of equity-accounted investees [line items]            
Initial investment at cost   82.1 91.7      
Share of accumulated losses brought forward   (92.2) (79.3)      
Share of loss after taxation   (1.4) (12.9)      
Carrying amount of interest in joint venture   $ 82.1 $ 91.7      
Interest on joint venture   40.00% 40.00% 40.00%    
Total share of results of equity-accounted investees after taxation   $ (1.4) $ (12.9) $ (1.6)    
Asanko Gold [member]            
Disclosure of equity-accounted investees [line items]            
Non-current assets   474.6 441.6      
Initial investment at cost   86.9 86.9      
Current assets   120.0 109.3      
Non-current liabilities   (79.4) (34.2)      
Current liabilities   (62.2) (52.7)      
Net assets   453.0 464.0      
Less: Shika redeemable preference shares   (271.4) (291.4)      
Net assets attributable to ordinary shareholders   181.6 172.6      
Group's share of net assets   89.9 85.8      
Cash consideration paid   165.0 165.0      
Less: consideration allocated to the redeemable preference shares (note 17)   (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   0.0 0.0      
Share of loss after taxation   4.1 (1.1)      
Carrying amount of interest in joint venture   89.9 85.8      
Revenue   341.0 122.0      
Production costs   (199.2) (79.0)      
Depreciation and amortisation   (95.4) (34.3)      
Other expenses   (20.1) (4.9)      
Royalties   (17.2) (6.2)      
Income tax expense   0.0 0.0      
Profit/(loss) for the year   9.1 (2.4)      
Other comprehensive income   0.0 0.0      
Total comprehensive income   9.1 (2.4)      
Group's share of total comprehensive income   4.1 (1.1)      
Asanko Gold [member] | Asanko Gold Ghana Limited [member]            
Disclosure of equity-accounted investees [line items]            
Carrying amount of interest in joint venture   $ 9.5 5.4      
Interest on joint venture   45.00%        
Asanko Gold [member] | Shika Group Finance Limited [member]            
Disclosure of equity-accounted investees [line items]            
Carrying amount of interest in joint venture   $ 80.4 80.4      
Interest on joint venture   50.00%        
Asanko Gold [member] | Adansi Gold Company Ghana Limited [member]            
Disclosure of equity-accounted investees [line items]            
Carrying amount of interest in joint venture   $ 0.0 0.0      
Interest on joint venture   50.00%        
Investment in associates [member]            
Disclosure of equity-accounted investees [line items]            
Total equity-accounted investees   $ 0.0 47.6      
Marverix Metals Incorporated [Member]            
Disclosure of equity-accounted investees [line items]            
Total equity-accounted investees   0.0 47.6      
Total share of results of equity-accounted investees after taxation   0.4 0.9 0.3    
The sale of the shares raised   66.8        
Profit on disposal   $ 14.6 $ 4.0   $ 48.0  
Common shares   4,125 10,000   10,000  
Percentage of ownership on diluted basis   3.68%        
Other [Member]            
Disclosure of equity-accounted investees [line items]            
Total equity-accounted investees   $ 0.0 $ 0.0      
Total share of results of equity-accounted investees after taxation   $ 0.0 $ 0.0 $ 0.0    
[1] Refer note 42.