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Employee Benefits (Tables)
 6 Months Ended
Apr. 30, 2016
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Schedule of Components of Net Periodic Pension Costs
Our results of operations for the three and six months ended April 30, 2016 and 2015 reflect the following components of net periodic pension costs:
Periods Ended April 30,
Three Months
 
Six Months
(In millions)
2016
 
2015
 
2016
 
2015
Service cost
$
2.3

 
$
2.0

 
$
4.6

 
$
4.1

Interest cost
1.2

 
1.1

 
2.5

 
2.1

Expected return on plan assets
(1.6
)
 
(1.5
)
 
(3.3
)
 
(3.0
)
Amortization of prior service cost
—

 
—

 
—

 
—

Recognized net actuarial loss
0.4

 
0.2

 
0.8

 
0.5

Net periodic pension cost
$
2.3

 
$
1.8

 
$
4.6

 
$
3.7