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Retirement benefit obligations - Assumptions used (Details) - Rentokil Initial Irish Pension Scheme
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Weighted average    
Disclosure of defined benefit plans    
Discount rate (as a percent) 3.50% 3.50%
Future pension increases (as a percent) 2.10% 2.30%
Inflation (as a percent) 2.10% 2.30%
Minimum    
Disclosure of defined benefit plans    
Pension scheme duration 15 years  
Maximum    
Disclosure of defined benefit plans    
Pension scheme duration 16 years