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Pension and Other Postretirement Benefits
 6 Months Ended
Dec. 31, 2024
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefits Pension and Other Postretirement Benefits
 
The components of the net periodic pension expense (income) related to the Company's pension and other postretirement benefits for the three and six months ended December 31, 2024 and 2023 were as follows:
 
Three Months Ended December 31,
2024202320242023
($ in millions)Pension PlansOther Postretirement Plans
Service cost$1.9 $2.0 $0.4 $0.4 
Interest cost9.7 11.8 2.5 2.5 
Expected return on plan assets(7.5)(10.1)(2.1)(1.8)
Amortization of net loss (gain)1.9 2.2 (1.4)(0.6)
Amortization of prior service cost (credits)0.5 0.5 0.3 (1.0)
    Net pension expense (income)$6.5 $6.4 $(0.3)$(0.5)
Six Months Ended December 31,
2024202320242023
($ in millions)Pension PlansOther Postretirement Plans
Service cost$3.8 $4.2 $0.8 $0.7 
Interest cost19.4 23.6 5.0 5.0 
Expected return on plan assets(15.0)(20.2)(4.2)(3.7)
Amortization of net loss (gain)3.8 4.4 (2.8)(1.2)
Amortization of prior service cost (credits)1.0 1.0 0.6 (2.0)
    Net pension expense (income)$13.0 $13.0 $(0.6)$(1.2)

During the six months ended December 31, 2024 and 2023, the Company made $15.1 million and $4.8 million, respectively, of contributions to its qualified defined benefit pension plans. The Company currently expects to make $11.5 million of required cash pension contributions to its qualified defined benefit pension plans during the remainder of fiscal year 2025.