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Related party transactions - Joint ventures and associate entities (Details)
Dec. 31, 2024
Dec. 31, 2023
Nippon Calmic Ltd    
Joint ventures and associate entities    
Ownership interest in associate 49.00% 49.00%
SCI Pierre Brossolette    
Joint ventures and associate entities    
Ownership interest in associate 26.25% 26.25%
Skadedyrkontrollen ost AS    
Joint ventures and associate entities    
Ownership interest in associate 40.00% 40.00%
Boecker Public Safety Services - Qatar W.L.L.    
Joint ventures and associate entities    
Ownership interest in associate 24.50% 24.50%
Boecker Public Health Services Limited    
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% 30.00%
Guangdong Vircon Pest Management Company Limited    
Joint ventures and associate entities    
Ownership interest in associate 30.00% 30.00%
Ningbo Yuying Vector Control Company Limited    
Joint ventures and associate entities    
Ownership interest in associate 30.00% 30.00%
Guangdong New Hope Environmental Technology Co., Ltd.    
Joint ventures and associate entities    
Ownership interest in associate 30.00% 30.00%