XML 55 R46.htm IDEA: XBRL DOCUMENT v3.23.3
Pension and Other Postretirement Benefits - Schedule of Components of the Net Periodic Pension (Income) Expense (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 2.0 $ 2.0
Interest cost 11.8 11.5
Expected return on plan assets (10.1) (11.2)
Amortization of net loss (gain) 2.2 2.4
Amortization of prior service cost (credits) 0.5 0.5
Net pension expense (income) 6.4 5.2
Other Postretirement Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0.4 0.5
Interest cost 2.5 2.4
Expected return on plan assets (1.8) (1.7)
Amortization of net loss (gain) (0.6) (0.4)
Amortization of prior service cost (credits) (1.0) (1.0)
Net pension expense (income) $ (0.5) $ (0.2)