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Post Retirement Benefit Plans (Tables)
 6 Months Ended
Apr. 30, 2017
Postemployment Benefits [Abstract]  
Components of Net Periodic Pension Cost
The components of net periodic pension cost include the following:
 
Three Months Ended
April 30,
 
Six Months Ended
April 30,
(in millions)
2017
 
2016
 
2017
 
2016
Service cost
$
3.3

 
$
3.1

 
$
6.6

 
$
6.2

Interest cost
4.6

 
5.6

 
9.2

 
11.2

Expected return on plan assets
(7.1
)
 
(8.3
)
 
(14.2
)
 
(16.6
)
Amortization of prior service cost and net actuarial gain
2.8

 
2.9

 
5.6

 
5.8

Net periodic pension costs
$
3.6

 
$
3.3

 
$
7.2

 
$
6.6
Components of Net Periodic Cost for Postretirement Benefits
The components of net periodic cost for postretirement benefits include the following:
 
Three Months Ended
April 30,
 
Six Months Ended
April 30,
(in millions)
2017
 
2016
 
2017
 
2016
Service cost
$
—

 
$
—

 
$
—

 
$
—

Interest cost
0.1

 
0.1

 
0.2

 
0.2

Amortization of prior service cost and net actuarial gain
(0.4
)
 
(0.4
)
 
(0.7
)
 
(0.8
)
Net periodic benefit for postretirement benefits
$
(0.3
)
 
$
(0.3
)
 
$
(0.5
)
 
$
(0.6
)