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Employee Benefit Plans (Tables)
 6 Months Ended
Jan. 31, 2019
Retirement Benefits, Description [Abstract]  
Components of net periodic pension costs
Net periodic benefit costs for the Company’s pension plans include the following components (in millions):
 
Three Months Ended
January 31,
 
Six Months Ended
January 31,
 
2019

 
2018

 
2019

 
2018

Net periodic benefit costs:
 

 
 

 
 

 
 

Service cost
$
1.5

 
$
2.1

 
$
3.0

 
$
4.1

Interest cost
4.1

 
3.7

 
8.2

 
7.4

Expected return on assets
(6.7
)
 
(6.6
)
 
(13.3
)
 
(13.1
)
Prior service cost amortization
0.2

 
0.2

 
0.3

 
0.3

Actuarial loss amortization
1.1

 
1.1

 
2.2

 
2.3

Net periodic benefit costs
$
0.2

 
$
0.5

 
$
0.4

 
$
1.0