v3.26.3
Pension and Other Postretirement Benefits - Schedule of Components of Net Periodic Pension Expense (Income) (Details) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 1.9 $ 1.7
Interest cost 9.3 9.3
Expected return on plan assets (9.0) (8.6)
Amortization of net loss (gain) 1.2 1.6
Amortization of prior service cost 0.0 0.4
Net pension expense (income) 3.4 4.4
Other Postretirement Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0.3 0.5
Interest cost 2.4 2.4
Expected return on plan assets (2.5) (2.2)
Amortization of net loss (gain) (2.1) (1.5)
Amortization of prior service cost 0.0 0.0
Net pension expense (income) $ (1.9) $ (0.8)