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Property, Plant and Equipment - Summary of Property, Plant and Equipment (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 ($)
Dec. 31, 2017
ZAR (R)
Jan. 01, 2018
USD ($)
Disclosure of detailed information about property, plant and equipment [line items]              
Carrying value of asset $ 4,657.1   $ 4,259.2 [1]       $ 4,892.9
Borrowing costs [2] $ 43.4   $ 17.5   $ 22.9    
Average interest capitalisation rate 6.20% 6.20% 5.90% 5.90%      
Write-off of exploration and evaluation assets - continuing operations $ 30.0   $ 37.7 [1]   51.5 [1]    
Exploration expense 84.4   104.2   109.8    
Cost Price Property Plant And Equipment [member]              
Disclosure of detailed information about property, plant and equipment [line items]              
Borrowing costs [3] 31.0   17.5        
Accumulated depreciation and impairment [Member]              
Disclosure of detailed information about property, plant and equipment [line items]              
Impairment and reversal of impairment, net 0.2   411.7        
Impairment 0.2   1.9        
South Deep Mine [member]              
Disclosure of detailed information about property, plant and equipment [line items]              
Impairment 0.0 R 0.0 481.5 R 6,470.9 277.8 R 3,495,000.0  
Damang Mining Fleet and Related Spare [Member]              
Disclosure of detailed information about property, plant and equipment [line items]              
Borrowing costs 20.0   9.9        
Damang Mining Fleet and Related Spare [Member] | Gruyere Mining Company Pty Ltd [member]              
Disclosure of detailed information about property, plant and equipment [line items]              
Borrowing costs 11.0   7.6        
Other impaired assets [member] | South Deep Mine [member]              
Disclosure of detailed information about property, plant and equipment [line items]              
Impairment 0.0 R 0.0 409.8 [4] R 5,507.0 $ 0.0 R 0.0  
Mine development infrastructure and other assets [Member]              
Disclosure of detailed information about property, plant and equipment [line items]              
Carrying value of asset [5] 3,939.4   3,680.7 [6]        
Mine development infrastructure and other assets [Member] | Cost Price Property Plant And Equipment [member]              
Disclosure of detailed information about property, plant and equipment [line items]              
Borrowing costs [5] 31.0   17.5 [6]        
Mine development infrastructure and other assets [Member] | Exploration and evaluation assets [member]              
Disclosure of detailed information about property, plant and equipment [line items]              
Carrying value of asset $ 0.0   $ 12.6        
[1] Refer note 42.
[2] Borrowing costs capitalised of US$43.4 million comprise borrowing costs relating to general borrowings of US$31.0 million and specific borrowings of US$12.4 million. The specific borrowings of US$12.4 million relate to the Gruyere project and are included in additions to property, plant and equipment of US$612.5 million (refer note 13).
[3] General borrowing costs of US$31.0 million (2018: US$17.5 million) arising on group general borrowings were capitalised during the period and comprised US$20.0 million (2018: US9.9 million) borrowings costs related to the Damang reinvestment project and US$11.0 million (2018: US7.6 million) borrowings costs related to the Gruyere project. An average interest capitalisation rate of 6.2% (2018: 5.9%) was applied.
[4] For the year ended 31 December 2019, the Group recognised an impairment of Rnil (US$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).
[5] Included in the cost of mine development, infrastructure and other assets are exploration and evaluation assets amounting to US$nil (2018: US$12.6 million).
[6] The remeasurements relate mainly to leases at the Group’s Australian operations that have variable payments linked to the Austalian consumer price index (“CPI”).