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Commitments And Contingencies (Narrative) (Details) - 3 months ended Mar. 31, 2022 - Nedbank [Member] - Guarantee [Member]
R in Millions, $ in Millions
USD ($)
ZAR (R)
Guarantor Obligations [Line Items]    
Guarantee amount $ 10.7 R 155.1
Maximum payment amount under guarantee $ 10.7 R 155.1
Minimum [Member]    
Guarantor Obligations [Line Items]    
Guarantees commission fee percent per annum 0.40%  
Maximum [Member]    
Guarantor Obligations [Line Items]    
Guarantees commission fee percent per annum 1.82%