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Equity-Accounted Investees - Asanko Gold (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of joint operations [line items]        
Assets held for sale $ 153.3 $ 0.0    
Investment in joint ventures 538.6 72.5    
Statement of financial position – Asanko        
Non-current assets 6,338.6 5,535.7    
Non-current liabilities (2,100.7) (2,213.2)    
Current liabilities (1,505.8) (785.4)    
Investment in joint ventures 538.6 72.5    
Revenue 4,500.7 4,286.7 $ 4,195.2  
Depreciation and amortisation (795.3) (844.3) (713.2)  
Other expenses (48.8) (15.3) (49.2)  
Royalties (116.4) (110.4) (112.4)  
Profit (loss) 726.3 721.7 829.5  
Property, plant and equipment 5,074.4 4,815.7    
Cash and cash equivalents 648.7 769.4 524.7 $ 886.8
Asanko Gold        
Statement of financial position – Asanko        
Cash and cash equivalents 138.6 91.3    
Asanko Gold        
Disclosure of joint operations [line items]        
Initial investment at cost 86.9 86.9    
Share of accumulated profit brought forward 87.9 74.9    
Share of profit after taxation before impairment 28.0 13.0    
Cumulative impairment (149.2) (102.3)    
Assets held for sale 53.6 0.0    
Investment in joint ventures 53.6 72.5    
Statement of financial position – Asanko        
Non-current assets 218.0 262.7    
Current assets 202.8 175.7    
Non-current liabilities (82.6) (69.7)    
Current liabilities (37.7) (29.0)    
Net assets 300.5 339.7    
Less: Shika redeemable preference shares (186.4) (186.4)    
Net assets attributable to ordinary shareholders 114.1 153.3    
Group's share of net assets 53.6 72.5    
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 87.9 74.9    
Share of profit after taxation before impairment 28.0 13.0    
Impairment (149.2) (102.3)    
Investment in joint ventures 53.6 72.5    
Revenue 256.5 297.1    
Production costs (155.6) (191.7)    
Depreciation and amortisation (13.7) (30.8)    
Other expenses (10.4) (30.8)    
Royalties (14.6) (14.9)    
Profit (loss) 62.2 28.9    
Group's share of profit before impairment 28.0 13.0    
Groups share of impairment 46.9 0.0    
Group's share of total comprehensive income after impairment (18.9) 13.0    
Property, plant and equipment 39.6 $ 39.6    
Asanko Gold | Non-current assets held for sale        
Disclosure of joint operations [line items]        
Investment in joint ventures 0.0      
Statement of financial position – Asanko        
Investment in joint ventures $ 0.0      
Asanko Gold | 2020 impairment trigger        
Statement of financial position – Asanko        
Impairment loss recognised in joint venture     $ 52.8