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Employee benefit expense - Emoluments of the Directors of Rentokil Initial plc (Details) - GBP (£)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Highest paid director      
Disclosure of defined benefit plans      
Aggregate emoluments excluding share options £ 2,698,700 £ 2,661,200 £ 867,300
Aggregate gains made by Directors on exercise of share options   916,300  
Aggregate amount receivable under long-term incentive schemes 831,900 3,340,000.0 3,187,900
Directors' remuneration expense 3,530,600 6,917,500 4,055,200
Other directors      
Disclosure of defined benefit plans      
Aggregate emoluments excluding share options 1,557,500 1,444,000.0 575,600
Aggregate gains made by Directors on exercise of share options 233,800 370,600  
Aggregate amount receivable under long-term incentive schemes 380,300 145,900 1,325,600
Directors' remuneration expense £ 2,171,600 £ 1,960,500 £ 1,901,200