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Summary of accounting policies - Foreign currency translation (Details) | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Algeria | Algerian Dinar (DZD) |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Average Rate | 131.67 | 134.15 | 135.98
Period-end Rate | 129.51 | 135.73 | 134.32
Cameroon | CFA Franc BEAC (XAF) |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Average Rate | 581.48 | 606.41 | 606.62
Period-end Rate | 558.73 | 631.50 | 594.31
China | Yuan Renminbi (CNY) |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Average Rate | 7.19 | 7.19 | 7.07
Period-end Rate | 7.00 | 7.30 | 7.08
Ivory Coast | CFA Franc BCEAO (XOF) |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Average Rate | 581.48 | 606.41 | 606.62
Period-end Rate | 558.73 | 631.50 | 594.31
Egypt | Egyptian Pound (EGP) |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Average Rate | 49.26 | 45.34 | 30.67
Period-end Rate | 47.69 | 50.84 | 30.93
Ghana | Cedi (Ghana) (GHS) |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Average Rate | 12.58 | 14.48 | 11.69
Period-end Rate | 10.52 | 14.72 | 11.97
Kenya | Kenyan Shilling (KES) |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Average Rate | 129.29 | 134.89 | 139.98
Period-end Rate | 129.09 | 129.37 | 157.01
Morocco | Moroccan Dirham (MAD) |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Average Rate | 9.35 | 9.94 | 10.13
Period-end Rate | 9.12 | 10.11 | 9.88
Nigeria | Naira (NGN) |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Average Rate | 1,520.69 | 1,480.98 | 636.97
Period-end Rate | 1,448.06 | 1,546.43 | 896.64
Portugal | Euro (EUR) |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Average Rate | 0.89 | 0.92 | 0.92
Period-end Rate | 0.85 | 0.96 | 0.91
Rwanda | Rwanda Franc (RWF) |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Average Rate | 1,431.28 | 1,318.18 | 1,159.04
Period-end Rate | 1,457.54 | 1,388.02 | 1,259.53
Senegal | CFA Franc BCEAO (XOF) |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Average Rate | 581.48 | 606.41 | 606.62
Period-end Rate | 558.73 | 631.50 | 594.31
South Africa | Rand (ZAR) |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Average Rate | 17.88 | 18.33 | 18.45
Period-end Rate | 16.58 | 18.83 | 18.30
Tunisia | Tunisian Dinar (TND) |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Average Rate | 2.99 | 3.11 | 3.10
Period-end Rate | 2.90 | 3.18 | 3.07
United Republic Of Tanzania | Tanzanian Shilling (TZS) |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Average Rate | 2,561.08 | 2,615.41 | 2,422.54
Period-end Rate | 2,469.64 | 2,429.68 | 2,512.42
Uganda | Uganda Shilling (UGX) |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Average Rate | 3,602.02 | 3,756.75 | 3,725.37
Period-end Rate | 3,621.06 | 3,680.02 | 3,780.17
United Arab Emirates | UAE Dirham (AED) |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Average Rate | 3.67 | 3.67 | 3.67
Period-end Rate | 3.67 | 3.67 | 3.67

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