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Equity-Accounted Investees - Summary of Equity-Accounted Investees (Detail) - USD ($)
$ in Millions
 12 Months Ended
Mar. 29, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of equity-accounted investees [line items]        
Non-current assets   $ 5,183.2 $ 5,505.7  
Current assets   921.1 1,114.4  
Non-current liabilities   (2,781.9) (2,363.1)  
Current liabilities   (615.5) (854.0)  
Less: Shika redeemable preference shares   (132.9)    
Cash consideration paid   216.8    
Consideration paid for equity portion   165.0    
Gain on acquisition   51.8 0.0 $ 0.0
Carrying amount of interest in joint venture   177.5 128.6 0.0
Revenue   2,577.8 2,761.8 2,666.4
Total equity-accounted investees   225.1 171.3 0.0
Total share of results of equity-accounted investees after taxation   (13.1) (1.3) (2.3)
Depreciation and amortisation   (668.4) (748.1) (671.4)
Other expenses   (44.8) (19.0) (16.8)
Royalties   (62.5) (62.0) (78.4)
Income tax expense   65.9 (173.2) (189.5)
(Loss)/profit for the year   (344.8) (7.7) 169.1
Other comprehensive income   (330.0) 279.2 121.4
Total comprehensive income   (674.8) 271.5 290.5
Asanko Gold Ghana Limited [member]        
Disclosure of equity-accounted investees [line items]        
Interest on joint venture 45.00%      
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   91.7 128.6  
Share of loss after taxation   12.9 1.6  
Carrying amount of interest in joint venture   $ 91.7 $ 128.6 $ 0.0
Interest on joint venture   40.00% 40.00% 40.00%
Total share of results of equity-accounted investees after taxation   $ (12.9) $ (1.6) $ (2.3)
Asanko Gold [member]        
Disclosure of equity-accounted investees [line items]        
Non-current assets   481.2    
Initial investment at cost   86.9    
Current assets   109.3    
Non-current liabilities   (34.2)    
Current liabilities   (52.7)    
Net assets   503.6    
Less: Provisional purchase price allocation - fair value adjustment   (39.6)    
Less: Shika redeemable preference shares   (291.4)    
Net assets attributable to ordinary shareholders   172.6    
Group's share of net assets   85.8    
Cash consideration paid   165.0    
Less: consideration allocated to the redeemable preference shares (note 17)   (129.9)    
Consideration paid for equity portion   35.1    
Gain on acquisition   51.8    
Share of loss after taxation   (1.1)    
Carrying amount of interest in joint venture   85.8 0.0 0.0
Revenue   122.0    
Production costs   (79.0)    
Depreciation and amortisation   (34.3)    
Other expenses   (4.9)    
Royalties   (6.2)    
Income tax expense   0.0    
(Loss)/profit for the year   (2.4)    
Other comprehensive income   0.0    
Total comprehensive income   (2.4)    
Group's share of total comprehensive income   (1.1)    
Asanko Gold [member] | Asanko Gold Ghana Limited [member]        
Disclosure of equity-accounted investees [line items]        
Carrying amount of interest in joint venture   $ 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    
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    
Interest on joint venture   50.00%    
Investment in associates [member]        
Disclosure of equity-accounted investees [line items]        
Total equity-accounted investees   $ 47.6 42.7 0.0
Marverix Metals Incorporated [Member]        
Disclosure of equity-accounted investees [line items]        
Total equity-accounted investees   47.6 42.7 0.0
Total share of results of equity-accounted investees after taxation   0.9 0.3 0.0
Other [Member]        
Disclosure of equity-accounted investees [line items]        
Total equity-accounted investees   0.0 0.0 0.0
Total share of results of equity-accounted investees after taxation   0.0 0.0 0.0
Asanko Gold Ghana Limited [member]        
Disclosure of equity-accounted investees [line items]        
Total share of results of equity-accounted investees after taxation   $ (1.1) $ 0.0 $ 0.0