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Post Retirement Benefit Plans (Tables)
 9 Months Ended
Jul. 31, 2017
Postemployment Benefits [Abstract]  
Components of Net Periodic Pension Cost
The components of net periodic pension cost include the following:
 
Three Months Ended
July 31,
 
Nine Months Ended
July 31,
(in millions)
2017
 
2016
 
2017
 
2016
Service cost
$
3.5

 
$
3.2

 
$
10.1

 
$
9.4

Interest cost
4.6

 
5.7

 
13.8

 
16.9

Expected return on plan assets
(7.0
)
 
(8.3
)
 
(21.2
)
 
(24.9
)
Amortization of prior service cost and net actuarial gain
2.6

 
2.8

 
8.2

 
8.6

Net periodic pension costs
$
3.7

 
$
3.4

 
$
10.9

 
$
10.0
Components of Net Periodic Cost for Postretirement Benefits
The components of net periodic cost for post retirement benefits include the following:
 
Three Months Ended
July 31,
 
Nine Months Ended
July 31,
(in millions)
2017
 
2016
 
2017
 
2016
Service cost
$
—

 
$
—

 
$
—

 
$
—

Interest cost
0.1

 
0.2

 
0.3

 
0.4

Amortization of prior service cost and net actuarial gain
(0.5
)
 
(0.4
)
 
(1.2
)
 
(1.2
)
Net periodic benefit for post retirement benefits
$
(0.4
)
 
$
(0.2
)
 
$
(0.9
)
 
$
(0.8
)