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Impairments - Narrative (Details)
shares in Millions, R in Millions
6 Months Ended 12 Months Ended
Nov. 22, 2017
lb
oz
shares
Dec. 31, 2018
ZAR (R)
Dec. 31, 2017
ZAR (R)
Jun. 30, 2017
ZAR (R)
Dec. 31, 2019
ZAR (R)
Dec. 31, 2018
ZAR (R)
Dec. 31, 2017
ZAR (R)
IMPAIRMENTS              
Impairments         R 86.0 R 3,041.4 R 4,411.0
Probable gold reserves | oz 2,400,000            
Probable uranium reserves | lb 54,260,000            
DRDGOLD Limited              
IMPAIRMENTS              
Number of shares acquired | shares 265            
Property, plant and equipment member              
IMPAIRMENTS              
Impairments         5.1 2,603.3 4,303.4
Property, plant and equipment member | Driefontein Assets [Member]              
IMPAIRMENTS              
Impairments   R 2,171.8          
Property, plant and equipment member | Beatrix Assets [Member]              
IMPAIRMENTS              
Impairments   166.9   R 603.7      
Property, plant and equipment member | Burnstone Assets [Member]              
IMPAIRMENTS              
Impairments           193.6  
Property, plant and equipment member | Cooke Assets [Member]              
IMPAIRMENTS              
Impairments       R 2,187.8      
Property, plant and equipment member | WRTRP Assets [Member]              
IMPAIRMENTS              
Impairments     R 1,245.1        
Property, plant and equipment member | De Bron Merriespruit Assets [Member]              
IMPAIRMENTS              
Impairments           227.1  
Goodwill              
IMPAIRMENTS              
Impairments         54.3 436.3 99.1
Goodwill | Driefontein Assets [Member]              
IMPAIRMENTS              
Impairments   166.9          
Goodwill | Kloof Assets [Member]              
IMPAIRMENTS              
Impairments   165.5          
Goodwill | Beatrix Assets [Member]              
IMPAIRMENTS              
Impairments   R 103.9          
Goodwill | WRTRP Assets [Member]              
IMPAIRMENTS              
Impairments     R 99.1        
Loan to equity-accounted investee              
IMPAIRMENTS              
Impairments         14.3 R 1.8 R 8.5
Investment in equity-accounted investee              
IMPAIRMENTS              
Impairments         R 12.3