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POST RETIREMENT BENEFIT PLANS (Tables)
 9 Months Ended
Jul. 31, 2018
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)
2018
 
2017
 
2018
 
2017
Service cost
$
3.1

 
$
3.5

 
$
9.7

 
$
10.1

Interest cost
4.7

 
4.6

 
13.9

 
13.8

Expected return on plan assets
(6.4
)
 
(7.0
)
 
(18.6
)
 
(21.2
)
Amortization of prior service cost and net actuarial gain
3.4

 
2.6

 
10.6

 
8.2

Net periodic pension costs
$
4.8

 
$
3.7

 
$
15.6

 
$
10.9
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)
2018
 
2017
 
2018
 
2017
Interest cost
$
0.1

 
$
0.1

 
$
0.3

 
$
0.3

Amortization of prior service cost and net actuarial gain
(0.4
)
 
(0.5
)
 
(1.2
)
 
(1.2
)
Net periodic benefit for post-retirement benefits
$
(0.3
)
 
$
(0.4
)
 
$
(0.9
)
 
$
(0.9
)