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Post Retirement Benefit Plans - Plan's Change in Benefit Obligation, Change in Plan Assets and Amounts Recognized in Consolidated Financial Statements (Detail) (Other Postretirement Benefit Plans, Defined Benefit [Member], USD $)
In Millions, unless otherwise specified
 12 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2010
Other Postretirement Benefit Plans, Defined Benefit [Member]
      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Benefit obligation at beginning of year $ 20.8 $ 21.6  
Service cost         
Interest cost 1.1 1.2 1.6
Actuarial loss 0.2 0.8 0.1
Foreign currency effect (0.3) (0.5)  
Plan amendments        
Benefits paid (2.4) (2.3)  
Benefit obligation at end of year 19.3 20.8 21.6
Funded status (19.3) (20.8)  
Unrecognized net actuarial loss (0.9) (1.1)  
Unrecognized prior service credit (10.7) (12.4)  
Net amount recognized $ (30.9) $ (34.3)