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Retirement benefits
 3 Months Ended
Sep. 30, 2020
Retirement Benefits [Abstract]  
Retirement benefits Retirement benefits
Net pension benefit expense recognized included the following components:
 
Three Months Ended
 
September 30,
 
2020
 
2019
Service cost
$
22,810

 
$
19,549

Interest cost
25,417

 
33,993

Expected return on plan assets
(66,402
)
 
(63,895
)
Amortization of prior service cost
843

 
1,509

Amortization of net actuarial loss
52,331

 
39,561

Amortization of initial net obligation
5

 
4

Net pension benefit expense
$
35,004

 
$
30,721


During the three months ended September 30, 2020 and 2019, we recognized $385 and $457, respectively, in expense related to other postretirement benefits. Components of retirement benefits expense, other than service cost, are included in other (income), net in the Consolidated Statement of Income.