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Equity-Accounted Investees - Asanko Gold (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of joint operations [line items]        
Investment in joint ventures $ 173.1 $ 233.3    
Acquisition-date fair value of total consideration transferred [abstract]        
Non-current assets 5,927.7 5,713.0    
Non-current liabilities (2,396.3) (2,728.1)    
Current liabilities (822.4) (916.5)    
Investment in joint ventures 173.1 233.3    
Revenue 4,195.2 3,892.1 $ 2,967.1  
Depreciation and amortisation (713.2) (661.3) (610.0)  
Other expenses (49.2) (11.5) (67.6)  
Royalties (112.4) (105.0) (73.7)  
Profit for the year 829.5 745.4 174.7  
Property, plant and equipment 5,079.1 4,771.2    
Cash and cash equivalents 524.7 886.8 $ 515.0 $ 219.7
Asanko Gold        
Acquisition-date fair value of total consideration transferred [abstract]        
Cash and cash equivalents 49.2 64.3    
Asanko Gold        
Disclosure of joint operations [line items]        
Initial investment at cost 86.9 86.9    
Share of accumulated profit brought forward 51.5 3.0    
Share of profit after taxation before impairment 23.4 48.5    
Cumulative impairment (102.3) (49.5)    
Investment in joint ventures 59.5 88.9    
Acquisition-date fair value of total consideration transferred [abstract]        
Non-current assets 290.5 392.9    
Current assets 170.7 170.6    
Non-current liabilities (81.0) (71.8)    
Current liabilities (68.5) (109.7)    
Net assets 311.7 382.0    
Less: Shika redeemable preference shares (186.4) (196.4)    
Net assets attributable to ordinary share holders 125.3 185.6    
Group's share of net assets 59.5 88.9    
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 51.5 3.0    
Share of profit after taxation before impairment 23.4 48.5    
Impairment (102.3) (49.5)    
Investment in joint ventures 59.5 88.9    
Revenue 382.4 418.1    
Production costs (247.0) (222.5)    
Depreciation and amortisation (45.3) (50.9)    
Other expenses (19.1) (16.0)    
Royalties (19.1) (20.9)    
Profit for the year 51.9 107.8    
Group's share of profit before impairment 23.4 48.5    
Groups share of impairment (52.8) (49.5)    
Group's share of total comprehensive income after impairment (29.4) (1.0)    
Property, plant and equipment 39.6      
Asanko Gold | 2020 impairment trigger        
Acquisition-date fair value of total consideration transferred [abstract]        
Impairment loss recognised in joint venture $ 52.8 $ 49.5