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Lease - Incremental borrowing rates (Details)
Jun. 30, 2021
Jun. 30, 2020
Minimum | South Africa    
Leases    
Incremental borrowing rates for leases 6.19% 6.25%
Minimum | North America    
Leases    
Incremental borrowing rates for leases 2.15% 2.15%
Minimum | Eurasia    
Leases    
Incremental borrowing rates for leases 0.38% 1.00%
Maximum | South Africa    
Leases    
Incremental borrowing rates for leases 15.35% 16.58%
Maximum | North America    
Leases    
Incremental borrowing rates for leases 5.64% 5.64%
Maximum | Eurasia    
Leases    
Incremental borrowing rates for leases 6.35% 5.00%