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Integration and Restructuring Costs (Tables)
 12 Months Ended
Apr. 30, 2018
Restructuring and Related Activities [Abstract]  
Integration Costs [Table Text Block]
The following table summarizes the one-time costs incurred in relation to the Big Heart acquisition.
  
2018

 
2017

 
2016

Total Costs
Incurred to Date
at April 30, 2018
 
Employee-related costs
$
8.5

 
$
16.3

 
$
52.4

 
$
90.6

Outside service and consulting costs
11.6

 
33.9

 
56.0

 
117.6

Other costs
6.5

 
13.9

 
36.8

 
63.7

Total one-time costs
$
26.6

 
$
64.1

 
$
145.2

 
$
271.9
Restructuring and Related Costs [Table Text Block]
The following table summarizes our one-time costs incurred in relation to the organization optimization program.
  
2018

 
2017

 
2016

Total Costs
Incurred to Date
at April 30, 2018
 
Employee-related costs
$
10.1

 
$
12.4

 
$
1.3

 
$
23.8

Outside service and consulting costs
0.4

 
1.8

 
—

 
2.2

Other costs
12.2

 
4.4

 
—

 
16.6

Total one-time costs
$
22.7

 
$
18.6

 
$
1.3

 
$
42.6