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Pensions and Other Postretirement Benefits
3 Months Ended
Jul. 31, 2019
Retirement Benefits [Abstract]  
Pensions and Other Postretirement Benefits
The components of our net periodic benefit cost for defined benefit pension and other postretirement benefit plans are shown below.
 
Three Months Ended July 31,
 
Defined Benefit Pension Plans
 
Other Postretirement Benefits
 
2019
 
2018
 
2019
 
2018
Service cost
$
0.4

 
$
0.6

 
$
0.5

 
$
0.4

Interest cost
5.2

 
5.9

 
0.6

 
0.6

Expected return on plan assets
(6.0
)
 
(6.8
)
 

 

Amortization of net actuarial loss (gain)
2.0

 
2.0

 
(0.1
)
 
(0.1
)
Amortization of prior service cost (credit)
0.2

 
0.2

 
(0.3
)
 
(0.3
)
Net periodic benefit cost
$
1.8

 
$
1.9

 
$
0.7

 
$
0.6