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Post employment benefits - Expected age at death of an average worker who retires currently at age 65, one who is currently aged 45 and subsequently retires at the age of 65 (Details) - yr
12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
United Kingdom | Retiring currently at age 65 | Male      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 86.8 86.8 87.1
United Kingdom | Retiring currently at age 65 | Female      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 88.4 88.4 88.7
United Kingdom | Currently aged 45, retiring at age 65 | Male      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 88.1 88.1 88.5
United Kingdom | Currently aged 45, retiring at age 65 | Female      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 90.5 90.4 90.7
Ireland | Retiring currently at age 65 | Male      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 87.2 87.2 87.7
Ireland | Retiring currently at age 65 | Female      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 89.7 89.6 90.0
Ireland | Currently aged 45, retiring at age 65 | Male      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 88.8 88.8 89.3
Ireland | Currently aged 45, retiring at age 65 | Female      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 91.4 91.3 91.7
United States | Retiring currently at age 65 | Male      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 85.7 85.6 85.5
United States | Retiring currently at age 65 | Female      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 87.4 87.2 87.2
United States | Currently aged 45, retiring at age 65 | Male      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 87.2 87.1 87.0
United States | Currently aged 45, retiring at age 65 | Female      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 88.9 88.7 88.6