Retirement Benefits - Schedule of Weighted-Average Allocation of Majority of Assets Related to Defined Benefit Plans (Details)	Jun. 30, 2025	Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items]
Weighted-average allocation of assets related to defined benefit plans (as percent)	100.00%	100.00%
Equities
Defined Benefit Plan Disclosure [Line Items]
Weighted-average allocation of assets related to defined benefit plans (as percent)	20.00%	26.00%
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Weighted-average allocation of assets related to defined benefit plans (as percent)	46.00%	45.00%
Other investments
Defined Benefit Plan Disclosure [Line Items]
Weighted-average allocation of assets related to defined benefit plans (as percent)	34.00%	29.00%