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Retirement benefit obligations - Assumptions used (Details) - Rentokil Initial Irish Pension Scheme
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Weighted average    
Disclosure of defined benefit plans    
Discount rate (as a percent) 3.50% 4.20%
Future pension increases (as a percent) 2.30% 2.60%
Inflation (as a percent) 2.30% 2.60%
Minimum    
Disclosure of defined benefit plans    
Pension scheme duration 16 years  
Maximum    
Disclosure of defined benefit plans    
Pension scheme duration 17 years