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Pension and Other Postretirement Benefits
 3 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefits Pension and Other Postretirement Benefits
 
The components of the net periodic pension (income) expense related to the Company's pension and other postretirement benefits for the three months ended September 30, 2021 and 2020 were as follows:
 
Three months ended September 30,Pension PlansOther Postretirement Plans
($ in millions)2021202020212020
Service cost$2.1 $2.4 $0.6 $0.7 
Interest cost9.1 9.9 1.8 1.9 
Expected return on plan assets(14.9)(13.9)(2.0)(1.6)
Amortization of net loss (gain)2.1 4.3 (0.2)0.9 
Amortization of prior service cost (credits)0.6 0.5 (1.0)(1.0)
Net pension (income) expense$(1.0)$3.2 $(0.8)$0.9 

During the three months ended September 30, 2021 and 2020, the Company made $0.2 million and $2.9 million, respectively, of contributions to its qualified defined benefit pension plans. The Company currently does not expect to contribute additional amounts to its U.S. qualified defined benefit pension plans during the remainder of fiscal year 2022.