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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
Dec. 31, 2018
USD ($)
$ / oz
R / kg
Exchange_Rate
oz
Dec. 31, 2018
ZAR (R)
Exchange_Rate
oz
Dec. 31, 2017
USD ($)
Dec. 31, 2017
ZAR (R)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
ZAR (R)
Dec. 31, 2020
R / kg
Dec. 31, 2019
R / kg
Dec. 31, 2018
ZAR (R)
$ / oz
R / kg
Disclosures of impairment of investments and assets [line items]                  
Investments $ 36.9   $ 3.7   $ 0.1        
Group impairment recognised $ 71.7   $ 277.8   0.0        
Nominal discount rate 13.50% 13.50% 13.50% 13.50%          
Far Southeast Gold Resources Incorporated [member]                  
Disclosures of impairment of investments and assets [line items]                  
Investments [1] $ 36.9   $ 0.0   0.0        
Equity method investment ownership percentage 60.00% 60.00%              
South Deep Mine [member]                  
Disclosures of impairment of investments and assets [line items]                  
Group impairment recognised $ 481.5 R 6,470,900.0 277.8 R 3,495,000.0 0.0 R 0.0      
Resource price | $ / oz 17               17
Rand/Dollar exchange rate | Exchange_Rate 14.63 14.63              
Resource ounces | oz 24.5 24.5              
Life time of mine 75 years 75 years              
Nominal discount rate 13.50% 13.50%              
Gold price | R / kg 525,000           550,000 525,000 525,000
Impairment recoverable amount $ 1,400.0               R 21,200.0
South Deep Mine [member] | Thereafter [member]                  
Disclosures of impairment of investments and assets [line items]                  
Gold price | R / kg 550,000               550,000
Other impaired assets [member] | South Deep Mine [member]                  
Disclosures of impairment of investments and assets [line items]                  
Group impairment recognised $ 409.8 [2] R 5,507.0 0.0 [2] 0.0 0.0 [2]        
Goodwill [member] | South Deep Mine [member]                  
Disclosures of impairment of investments and assets [line items]                  
Group impairment recognised 71.7 [2] R 963.9 277.8 [2] R 3,495.0 0.0 [2]        
Other Property, Pant and Equipment [Member]                  
Disclosures of impairment of investments and assets [line items]                  
(Impairment)/reversal of impairment of property, plant and equipment - other 0.0   53.4   (66.4)        
Other Property, Pant and Equipment [Member] | Redundant Assets at Cerro Corona [Member]                  
Disclosures of impairment of investments and assets [line items]                  
- Redundant assets at Cerro Corona (1.9)   (0.8)   0.0        
Other Property, Pant and Equipment [Member] | Damang Asset Held For Sale [member]                  
Disclosures of impairment of investments and assets [line items]                  
Impairment loss recognised 0.0   0.0   (7.6)        
Other Property, Pant and Equipment [Member] | Assets Specific Impairment At Tarkwa [member]                  
Disclosures of impairment of investments and assets [line items]                  
Impairment loss recognised 0.0   (6.8)   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 recognised 0.0   (3.5)   (2.4)        
Other [member]                  
Disclosures of impairment of investments and assets [line items]                  
(Impairment)/reversal of impairment of property, plant and equipment - other [3] $ (1.9)   $ 42.3   $ (76.4)        
[1] Following the identification of impairment indicators at 31 December 2018, FSE was valued at its recoverable amount which resulted in an impairment of US$36.9 million. The recoverable amount was based on the fair value less cost of disposal ("FVLCOD") of the investment (level 2 in the fair value hierarchy). The 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.
[2] For the year ended 31 December 2018, the Group recognised an impairment of R6,470.9 million (US$481.5 million) (2017: R3,495.0 billion (US$277.8 million) and 2016: Rnil (US$nil)) in respect of the South Deep cash-generating unit due to the deferral of production.
[3] (Impairment)/reversal of impairment of property, plant and equipment - other is made up as follows: