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Retirement benefits
 3 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Retirement benefits Retirement benefits
Net pension benefit expense recognized included the following components:
 
Three Months Ended
 
September 30,
 
2019
 
2018
Service cost
$
19,549

 
$
20,509

Interest cost
33,993

 
39,866

Expected return on plan assets
(63,895
)
 
(62,877
)
Amortization of prior service cost
1,509

 
1,648

Amortization of net actuarial loss
39,561

 
29,293

Amortization of initial net obligation
4

 
4

Net pension benefit expense
$
30,721

 
$
28,443


During the three months ended September 30, 2019 and 2018, we recognized $457 and $650, 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.