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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)
R in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
ZAR (R)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
ZAR (R)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
ZAR (R)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Disclosures of impairment of investments and assets [line items]                    
Investments $ 9.6   $ 36.9   $ 3.7       $ 3.2 $ 89.7
Impairment amounts disclosed relate to a specific impairment for South Deep Goodwill 0.0   71.7   277.8          
Far Southeast Gold Resources Incorporated [member]                    
Disclosures of impairment of investments and assets [line items]                    
Investments [1] $ 9.6   36.9   0.0          
Equity method investment ownership percentage 60.00% 60.00%                
South Deep Mine [member]                    
Disclosures of impairment of investments and assets [line items]                    
Impairment loss $ 0.0 R 0.0 481.5 R 6,470.9 277.8 R 3,495,000.0        
Other impaired assets [member] | South Deep Mine [member]                    
Disclosures of impairment of investments and assets [line items]                    
Impairment loss 0.0 0.0 409.8 [2] 5,507.0 0.0 0.0        
Goodwill [member] | South Deep Mine [member]                    
Disclosures of impairment of investments and assets [line items]                    
Impairment amounts disclosed relate to a specific impairment for South Deep Goodwill 0.0 [2] R 0.0 71.7 R 963.9 277.8 [2] R 3,495,000.0        
CUG at Cerro Corona [member]                    
Disclosures of impairment of investments and assets [line items]                    
(Impairment)/reversal of impairment of property, plant and equipment - other             $ (66.4)      
CUG at Cerro Corona [member] | Redundant Assets at Cerro Corona [Member]                    
Disclosures of impairment of investments and assets [line items]                    
- Redundant assets at Cerro Corona (0.2)   (1.9)   (0.8)          
CUG at Cerro Corona [member] | Assets Specific Impairment At Tarkwa [member]                    
Disclosures of impairment of investments and assets [line items]                    
Impairment loss recognised 0.0   0.0   (6.8)          
CUG at Cerro Corona [member] | Assets Specific Impairment At Damang [member]                    
Disclosures of impairment of investments and assets [line items]                    
Impairment loss recognised 0.0   0.0   (3.5)          
CUG at Cerro Corona [member] | CGU at Cerro Corona [Member]                    
Disclosures of impairment of investments and assets [line items]                    
(Impairment)/reversal of impairment of property, plant and equipment - other 0.0   0.0   53.4          
Property, plant and equipment [member]                    
Disclosures of impairment of investments and assets [line items]                    
Assets held for sale of reclassified recoverable amount             $ 1.0      
Other [member]                    
Disclosures of impairment of investments and assets [line items]                    
(Impairment)/reversal of impairment of property, plant and equipment - other $ (0.2)   $ (1.9)   $ 42.3          
Arctic platinum [member]                    
Disclosures of impairment of investments and assets [line items]                    
Impairment loss                 40.0  
Carrying value of impairment               $ 39.0 $ 1.0  
[1] Following the identification of impairment indicators during 2018 and 2019, FSE was valued at its recoverable amount which resulted in a net impairment of US$36.9 million and US$9.6 million, respectively. The recoverable amount was based on the fair value less cost of disposal (“FVLCOD”) of the investment (level 2 in the fair value hierarchy). The FVLCOD was indirectly derived from the market value of Lepanto Consolidated Mining Company, being the 60% shareholder of FSE. The net impairment is included in the “Corporate and other” segment.
[2] For the year ended 31 December 2019, the Group recognised an impairment of Rnil (US$nil) (2018: R6,470.9 million (US$481.5 million) and 2017: R3,495.0 billion (US$277.8 million)) in respect of the South Deep cash-generating unit due to the deferral of production. Rnil (US$nil) (2018: R963.9 million (US$71.7 million) and 2017: R3,495.0 billion (US$277.8 million)) of the total impairment was firstly allocated against goodwill and the remainder of Rnil (US$nil) (2018: R5,507.0 million (US$409.8 million) and 2017: Rnil (US$nil)) against other assets. The recoverable amount was based on its FVLCOD calculated using a combination of the market and the income approach (level 3 of the fair value hierarchy).