Retirement Benefits - Assumptions used to measure periodic benefit cost (Details) - Pension Plan	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
United States
Assumptions used to measure net periodic benefit cost
Discount rate	4.36%	2.55%	2.36%
Average increase in compensation	3.35%	3.05%	2.98%
Expected return on plan assets	6.50%	6.50%	6.75%
Minimum | Foreign Plan
Assumptions used to measure net periodic benefit cost
Discount rate	0.60%	0.25%	0.20%
Average increase in compensation	1.75%	1.75%	1.75%
Expected return on plan assets	1.00%	1.00%	1.00%
Maximum | Foreign Plan
Assumptions used to measure net periodic benefit cost
Discount rate	5.06%	2.95%	3.03%
Average increase in compensation	4.00%	4.50%	4.50%
Expected return on plan assets	5.10%	4.50%	5.40%