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Pensions and Other Postretirement Benefits (Tables)
 3 Months Ended
Jul. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Net periodic benefit cost
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
 
2016
 
2015
 
2016
 
2015
Service cost
$
4.1

 
$
4.7

 
$
0.6

 
$
0.6

Interest cost
6.7

 
7.0

 
0.7

 
0.7

Expected return on plan assets
(7.3
)
 
(8.4
)
 
—

 
—

Recognized net actuarial loss
3.7

 
2.7

 
—

 
—

Prior service cost (credit)
0.3

 
0.2

 
(0.4
)
 
(0.3
)
Curtailment gain
—

 
(3.7
)
 
—

 
—

Settlement loss
0.1

 
—

 
—

 
—

Net periodic benefit cost
$
7.6

 
$
2.5

 
$
0.9

 
$
1.0