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Post Retirement Benefits Plans - Components of Net Periodic Cost for Postretirement Benefits (Detail) (Other Postretirement Benefit Plans, Defined Benefit [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2011
Other Postretirement Benefit Plans, Defined Benefit [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Service cost       
Interest cost 0.8 1.1 1.2
Amortization of prior service cost (1.5) (1.6) (1.6)
Recognized net actuarial gain     (0.1)
Net periodic (income) cost $ (0.7) $ (0.5) $ (0.5)