v3.26.1
Pension and Other Postretirement Benefits - Summary of Amounts Recognized in the Accumulated other Comprehensive Loss (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Jun. 30, 2025
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation $ 639.9 $ 678.6
Fair value of plan assets 547.1 528.4
Other Postretirement Plans    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation 24.3 171.1
Fair value of plan assets $ 0.0 $ 143.3