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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 (Detail)
R in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
ZAR (R)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
ZAR (R)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
ZAR (R)
Disclosures of impairment of investments and assets [line items]            
Investments $ (36.9)   $ (3.7)   $ (0.1)  
Property, plant and equipment (411.7)   81.3   (76.4)  
Goodwill (71.7)   (277.8)   0.0  
Impairment, net of reversal of impairment of investments and assets (520.3)   (200.2)   (76.5)  
Other [member]            
Disclosures of impairment of investments and assets [line items]            
(Impairment)/reversal of impairment of property, plant and equipment [1] (1.9)   42.3   (76.4)  
Arctic Platinum Project [Member]            
Disclosures of impairment of investments and assets [line items]            
(Impairment)/reversal of impairment of property, plant and equipment [2] 0.0   39.0   0.0  
South Deep Mine [member]            
Disclosures of impairment of investments and assets [line items]            
South Deep cash-generating unit (481.5) R (6,470,900.0) (277.8) R (3,495,000.0) 0.0 R 0.0
South Deep Mine [member] | Other impaired assets [member]            
Disclosures of impairment of investments and assets [line items]            
South Deep cash-generating unit (409.8) [3] (5,507.0) 0.0 [3] 0.0 0.0 [3]  
South Deep Mine [member] | Goodwill [member]            
Disclosures of impairment of investments and assets [line items]            
Goodwill (71.7) [3] R (963.9) (277.8) [3] R (3,495.0) 0.0 [3]  
Far Southeast Gold Resources Incorporated [member]            
Disclosures of impairment of investments and assets [line items]            
Investments [4] (36.9)   0.0   0.0  
Investments - listed [member]            
Disclosures of impairment of investments and assets [line items]            
Investments 0.0   (0.5)   (0.1)  
Investments - unlisted [member]            
Disclosures of impairment of investments and assets [line items]            
Investments $ 0.0   $ (3.2)   $ 0.0  
[1] (Impairment)/reversal of impairment of property, plant and equipment - other is made up as follows:
[2] Refer note 12.2 for further details. The reversal of impairment was included in the "Corporate and other" segment.
[3] 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.
[4] 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.