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Equity-Accounted Investees - Summary of Equity-Accounted Investees (Parenthetical) (Detail) - USD ($)
shares in Thousands, $ in Millions
 6 Months Ended 12 Months Ended
Dec. 23, 2016
Mar. 31, 2012
Dec. 31, 2010
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
 [1]
Dec. 31, 2011
Dec. 31, 2010
Disclosure of equity-accounted investees [Line Items]                
Interest on unlisted entity       50.00%        
Profit on disposal       $ 4.0 $ 48.0 [1] $ (0.1)    
Investment in associates - Other       $ 42.7 $ 42.1      
Far Southeast Gold Resources Incorporated [Member]                
Disclosure of equity-accounted investees [Line Items]                
Interest on unlisted entity       40.00% 40.00%      
Option to acquire   40.00% 60.00%          
Non-refundable down payment   $ 110.0 $ 44.0       $ 66.0  
Percentage of ownership   20.00%            
Unlisted shares at cost       $ 230.0 $ 230.0      
Equity contribution       79.3 77.7      
Cumulative impairment       (101.4) (101.4)      
Share of accumulated losses brought forward       (77.7) (75.4)      
Share of loss after taxation       (1.6) (2.3)      
Total investment in joint venture       $ 128.6 $ 128.6      
Option remains exercisable       20.00%        
Option to acquire shares       20.00%        
Marverix Metals Incorporated [Member]                
Disclosure of equity-accounted investees [Line Items]                
Interest on listed entity       28.00% 32.00%      
Common Shares 42,850              
Common shares $ 10.0              
Profit on disposal $ 48.0              
Listed shares at cost       $ 42.1 $ 42.1      
Transaction costs capitalised       0.3 0.0      
Share of profit after taxation       0.3 0.0      
Investment in associates - Other       42.7 42.1      
Fair value of investment       57.2 42.1      
Other [Member]                
Disclosure of equity-accounted investees [Line Items]                
Investment in associates - Other       0.0 0.0      
Bezant Resources PLC [Member]                
Disclosure of equity-accounted investees [Line Items]                
Investment in associates - Other       $ 0.0 $ 0.0      
Bezant Resources PLC [Member] | Top of range [member]                
Disclosure of equity-accounted investees [Line Items]                
Holdings diluted percentage         21.60%      
Bezant Resources PLC [Member] | Bottom of range [member]                
Disclosure of equity-accounted investees [Line Items]                
Holdings diluted percentage         8.80%      
Rusoro Mining Limited [Member]                
Disclosure of equity-accounted investees [Line Items]                
Interest on listed entity       25.70%        
Investment in associates - Other       $ 0.0 $ 0.0      
Lepanto Consolidated Mining Company [Member]                
Disclosure of equity-accounted investees [Line Items]                
Option fees               $ 10.0
Percentage of remaining shares   60.00%            
[1] As Restated - Refer note 40 for further details.