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Impairment, Net of Reversal of Impairment of Investments and Assets - Summary of Impairment, Net of Reversal of Impairment of Investments and Assets (Parenthetical) (Detail)
oz in Millions, R in Millions, $ in Millions
 12 Months Ended
Jun. 30, 2015
USD ($)
Dec. 31, 2017
USD ($)
$ / oz
R / kg
Exchange_Rate
oz
Dec. 31, 2017
ZAR (R)
Exchange_Rate
oz
Dec. 31, 2016
USD ($)
$ / oz
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Disclosures of impairment of investments and assets [Line Items]              
Investments   $ 3.7   $ 0.1 $ 117.4    
Carrying value   4,892.9   4,524.6 [1] 4,295.6 [1]    
Reversal of impairment and impairment of property, plant and equipment - other, net   42.3   (76.4) (42.5)    
South Deep goodwill   $ 277.8   $ 0.0 0.0    
Resource price | $ / oz   17.0   60.0      
Nominal discount rate   13.50% 13.50% 13.50%      
South Deep Mine [member]              
Disclosures of impairment of investments and assets [Line Items]              
South Deep goodwill   $ 277.8 R 3,495.0        
Gold price | R / kg   525,000          
Resource price | $ / oz   17          
Rand/Dollar exchange rate | Exchange_Rate   12.58 12.58        
Resource ounces | oz   29 29        
Life time of mine   78 years 78 years        
Nominal discount rate   13.50% 13.50%        
Other Property, Pant and Equipment [Member]              
Disclosures of impairment of investments and assets [Line Items]              
Reversal of impairment and impairment of property, plant and equipment - other, net   $ 53.4   $ (66.4) 0.0    
Other Property, Pant and Equipment [Member] | Redundant Assets at Cerro Corona [Member]              
Disclosures of impairment of investments and assets [Line Items]              
Impairment loss       (66.4)      
Total impairment of property, plant and equipment - other   (0.8)   0.0 (6.7)    
Other Property, Pant and Equipment [Member] | Damang Asset Held For Sale [member]              
Disclosures of impairment of investments and assets [Line Items]              
Impairment loss   0.0   (7.6) 0.0    
Other Property, Pant and Equipment [Member] | Assets Specific Impairment At Tarkwa [member]              
Disclosures of impairment of investments and assets [Line Items]              
Impairment loss   (6.8)   0.0 0.0    
Other Property, Pant and Equipment [Member] | Assets Specific Impairment At Damang [Member]              
Disclosures of impairment of investments and assets [Line Items]              
Impairment loss   (3.5)   (2.4) (35.8)    
APP [Member]              
Disclosures of impairment of investments and assets [Line Items]              
Carrying value       1.0 1.0 $ 40.0  
Purchase offer, cash   $ 40.0          
Impairment loss         (39.0) $ (3.2) $ (89.7)
Purchase offer, refiner royalty offered percentage   2.00% 2.00%        
Hummingbird Resources Plc [Member]              
Disclosures of impairment of investments and assets [Line Items]              
Investments $ 7.5 $ 0.0 [2]   0.0 [2] 7.5 [2]    
Far Southeast Gold Resources Incorporated [Member]              
Disclosures of impairment of investments and assets [Line Items]              
Investments [3]   $ 0.0   $ 0.0 $ 101.4    
Percentage shareholder of FSE         60.00%    
[1] As Restated - Refer note 40 for further details.
[2] Following the identification of impairment indicators at 30 June 2015, the investment in Hummingbird was valued at its recoverable amount, which resulted in an impairment of US$7.5 million. The recoverable amount was based on the investment's fair value at the time, being its quoted market price (level 1 of the fair value hierarchy). The impairment is included in the "Corporate and other" segment.
[3] Following the identification of impairment indicators at 31 December 2015, FSE was valued at its recoverable amount which resulted in an impairment of US$101.4 million. The recoverable amount was based on the fair value less cost of disposal ("FVLCOD") of the investment (level 2 of the fair value hierarchy). FVLCOD was indirectly derived from the market value of Lepanto Consolidated Mining Company, being the 60% shareholder of FSE. The impairment is included in the "Corporate and other" segment.