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Post Retirement Benefit Plans - Components of Net Periodic Cost for Postretirement Benefits (Detail) - USD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 15.5 $ 15.7 $ 16.7
Interest cost 27.6 29.6 27.6
Amortization of prior service cost 0.1 0.2 0.6
Net periodic pension (benefit) cost 25.3 22.0 29.2
Other Postretirement Benefit Plans, Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.0 0.0 0.0
Interest cost 0.7 0.8 0.8
Amortization of prior service cost (1.5) (1.6) (1.5)
Recognized net actuarial gain (0.1)    
Net periodic pension (benefit) cost $ (0.9) $ (0.8) $ (0.7)