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Related party transactions - Joint ventures and associate entities (Details) | Dec. 31, 2022 | Oct. 12, 2022 | Dec. 31, 2021
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Nippon Calmic Ltd |  |  |
Joint ventures and associate entities |  |  |
Ownership interest in associate | 49.00% |  | 49.00%
Boecker Public Safety Services |  |  |
Joint ventures and associate entities |  |  |
Ownership interest in associate | 24.50% |  | 24.50%
Boecker Public Health Services |  |  |
Joint ventures and associate entities |  |  |
Ownership interest in associate | 30.00% |  | 30.00%
Fujian Xunke Pest Control Company Limited |  |  |
Joint ventures and associate entities |  |  |
Ownership interest in associate |  | 30.00% |
Guangdong Vircon Pest Management Company Limited |  |  |
Joint ventures and associate entities |  |  |
Ownership interest in associate |  | 30.00% |
Ningbo Yuying Vector Control Company Limited |  |  |
Joint ventures and associate entities |  |  |
Ownership interest in associate |  | 30.00% |
Guangdong New Hope City Pest Control Company Limited |  |  |
Joint ventures and associate entities |  |  |
Ownership interest in associate |  | 30.00% |

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