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Retirement benefits
 3 Months Ended
Sep. 30, 2022
Retirement Benefits [Abstract]  
Retirement benefits Retirement benefits
Net pension benefit expense recognized included the following components:
Three Months Ended
 September 30,
 20222021
Service cost$14,253 $20,662 
Interest cost46,351 27,429 
Expected return on plan assets(66,345)(67,328)
Amortization of prior service cost210 934 
Amortization of net actuarial loss6,443 37,531 
Amortization of initial net obligation — 2 
Net pension benefit expense$912 $19,230 
We recognized $0.2 million and $0.3 million in expense related to other postretirement benefits during the three months ended September 30, 2022 and 2021, respectively. Components of retirement benefits expense, other than service cost, are included in other (income) expense, net in the Consolidated Statement of Income.