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Pension and Other Postretirement Benefits
 3 Months Ended
Sep. 30, 2025
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 months ended September 30, 2025 and 2024 were as follows:
Three Months Ended September 30,
2025202420252024
($ in millions)Pension PlansOther Postretirement Plans
Service cost$1.7 $1.9 $0.5 $0.4 
Interest cost9.3 9.7 2.4 2.5 
Expected return on plan assets(8.6)(7.5)(2.2)(2.1)
Amortization of net loss (gain)1.6 1.9 (1.5)(1.4)
Amortization of prior service cost0.4 0.5 — 0.3 
    Net pension expense (income)$4.4 $6.5 $(0.8)$(0.3)

During the three months ended September 30, 2025 and 2024, the Company made $5.9 million and $9.6 million, respectively, of cash contributions to its qualified defined benefit pension plans. The Company currently expects to make $17.6 million of required cash pension contributions to its domestic qualified defined benefit pension plans during the remainder of fiscal year 2026.