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Equity-Accounted Investees - Asanko Gold (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of joint operations [line items]        
Investment in joint ventures $ 72.5 $ 173.1    
Acquisition-date fair value of total consideration transferred [abstract]        
Non-current assets 5,535.7 5,927.7    
Non-current liabilities (2,213.2) (2,396.3)    
Current liabilities (785.4) (822.4)    
Investment in joint ventures 72.5 173.1    
Revenue 4,286.7 4,195.2 $ 3,892.1  
Depreciation and amortisation (844.3) (713.2) (661.3)  
Other expenses (15.3) (49.2) (11.5)  
Royalties (110.4) (112.4) (105.0)  
Profit for the year 721.7 829.5 745.4  
Property, plant and equipment 4,815.7 5,079.1    
Cash and cash equivalents 769.4 524.7 $ 886.8 $ 515.0
Asanko Gold        
Acquisition-date fair value of total consideration transferred [abstract]        
Cash and cash equivalents 91.3 49.2    
Asanko Gold        
Disclosure of joint operations [line items]        
Initial investment at cost 86.9 86.9    
Share of accumulated profit brought forward 74.9 51.5    
Share of profit after taxation before impairment 13.0 23.4    
Cumulative impairment (102.3) (102.3)    
Investment in joint ventures 72.5 59.5    
Acquisition-date fair value of total consideration transferred [abstract]        
Non-current assets 262.7 290.5    
Current assets 175.7 170.7    
Non-current liabilities (69.7) (81.0)    
Current liabilities (29.0) (68.5)    
Net assets 339.7 311.7    
Less: Shika redeemable preference shares (186.4) (186.4)    
Net assets attributable to ordinary share holders 153.3 125.3    
Group's share of net assets 72.5 59.5    
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 74.9 51.5    
Share of profit after taxation before impairment 13.0 23.4    
Impairment (102.3) (102.3)    
Investment in joint ventures 72.5 59.5    
Revenue 297.1 382.4    
Production costs (191.7) (247.0)    
Depreciation and amortisation (30.8) (45.3)    
Other expenses (30.8) (19.1)    
Royalties (14.9) (19.1)    
Profit for the year 28.9 51.9    
Group's share of profit before impairment 13.0 23.4    
Groups share of impairment 0.0 (52.8)    
Group's share of total comprehensive income after impairment 13.0 (29.4)    
Property, plant and equipment $ 39.6 39.6    
Asanko Gold | 2020 impairment trigger        
Acquisition-date fair value of total consideration transferred [abstract]        
Impairment loss recognised in joint venture   $ 52.8