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Consolidated Valuation and Qualifying Accounts and Reserves (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2010
Allowance for doubtful accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 13.8 $ 13.3 $ 12.5
Charged to Costs and Expenses 3.6 1.0 1.1
Charged to Other Accounts (0.3) (0.5) (0.2)
Deductions     (0.1)
Balance at End of Period 17.1 13.8 13.3
Environmental reserves [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 29.3 26.2 33.4
Charged to Costs and Expenses 1.3 4.5 0.4
Charged to Other Accounts (2.4) (1.3) (1.5)
Deductions (0.7) (0.1) (6.1)
Balance at End of Period $ 27.5 $ 29.3 $ 26.2