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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, 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)
Disclosure of detailed information about property, plant and equipment [line items]            
Carrying value of asset $ 4,259.2   $ 4,892.9      
Borrowing costs $ 17.5   $ 22.9   $ 15.1  
Average interest capitalisation rate 5.90% 5.90% 5.30% 5.30%    
Write-off of exploration and evaluation assets - continuing operations $ 37.7   $ 51.5   41.4  
Exploration expense 104.2   109.8   86.1  
Accumulated depreciation and impairment [Member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Impairment and reversal of impairment, net 411.7   (81.3)      
Impairment 1.9   11.1      
South Deep Mine [member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Impairment 481.5 R 6,470,900.0 277.8 R 3,495,000.0 0.0 R 0.0
Cerro corona [member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Reversal of impairment 53.4          
Senior secured revolving credit facility [Member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Assets pledged as security 100.0          
Damang Mining Fleet and Related Spare [Member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Borrowing costs 9.9   2.1      
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 7.6   1.4      
Damang Mining Fleet and Related Spare [Member] | South Deep Mine [member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Borrowing costs 0.0   19.4      
Other impaired assets [member] | South Deep Mine [member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Impairment 409.8 [1] R 5,507.0 0.0 [1] R 0.0 0.0 [1]  
Fleet assets [member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Carrying value of asset 0.0   183.6      
Mine development infrastructure and other assets [Member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Carrying value of asset 3,680.7   4,253.3      
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 12.6   10.8      
Arctic Platinum Project [Member]            
Disclosure of detailed information about property, plant and equipment [line items]            
Reversal of impairment [2] $ 0.0   $ 39.0   $ 0.0  
[1] 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.
[2] Refer note 12.2 for further details. The reversal of impairment was included in the "Corporate and other" segment.