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Provisions - Schedule of Provisions (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Provisions [Line Items]          
Environmental rehabilitation costs $ 283.1 $ 275.4 $ 275.4 $ 281.5 $ 283.1
South Deep dividend       6.4 6.4
Silicosis settlement costs 31.9 0.0      
Other       1.5 2.2
Total provisions       $ 321.3 $ 291.7 [1]
Environmental rehabilitation costs Balance at beginning of the year 283.1 275.4      
Changes in estimates - Continuing operations (5.4) 4.9      
Changes in estimates - discontinued operations 0.0 0.1      
Interest expense - Continuing operations 12.1 10.7 [1] 11.7 [1]    
Interest expense - discontinued operations 0.2 0.2      
Payments (8.1) (7.4)      
Disposal of subsidiary (12.9) 0.0      
Translation adjustment 12.5 (0.8)      
Environmental rehabilitation costs balance at end of the year 281.5 283.1 $ 275.4    
Total gross closure cost estimates 381.0 380.8      
South Africa [member]          
Disclosure of Provisions [Line Items]          
Total gross closure cost estimates 41.8 37.1      
Ghana [member]          
Disclosure of Provisions [Line Items]          
Total gross closure cost estimates 98.1 105.3      
Australia [member]          
Disclosure of Provisions [Line Items]          
Total gross closure cost estimates 179.2 181.8      
Peru [member]          
Disclosure of Provisions [Line Items]          
Total gross closure cost estimates $ 61.9 $ 56.6      
[1] As Restated - Refer note 40 for further details.