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Related party transactions - Joint ventures and associate entities (Details)
Dec. 31, 2022
Oct. 12, 2022
Dec. 31, 2021
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%