v3.26.1
Pension Plans and Other Postretirement Benefit Plans - Weighted-Average Asset Allocation (Details)
Jun. 30, 2026
Jun. 30, 2025
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, actual allocation, percentage 100.00% 100.00%
Fixed income securities    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, actual allocation, percentage 82.00% 82.00%
Defined benefit plan, plan assets, target allocation, percentage 85.00%  
Equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, actual allocation, percentage 15.00% 15.00%
Defined benefit plan, plan assets, target allocation, percentage 15.00%  
Cash equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, actual allocation, percentage 3.00% 3.00%
Union Plans    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, target allocation, percentage 100.00%