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Financial Instruments And Fair Value Measurements - Estimated Fair Value Compared to the Carrying Amount for the Company's Senior Notes and the Assets Held by Special Purpose Entities (Detail) (USD $)
In Millions, unless otherwise specified
Apr. 30, 2014
Oct. 31, 2013
Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments [Line Items]    
Carrying amount $ 1,315.8 $ 1,217.2
Senior Notes Due 2017 [Member]
    
Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments [Line Items]    
Estimated fair value 336.7 334.5
Carrying amount 301.5 301.8
Senior Notes Due 2019 [Member]
    
Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments [Line Items]    
Estimated fair value 288.1 289.9
Carrying amount 244.7 244.4
Senior Notes Due 2021 [Member]
    
Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments [Line Items]    
Estimated fair value 329.1 317.9
Carrying amount 274.1 272.9
Assets held by special purpose entities [Member]
    
Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments [Line Items]    
Estimated fair value 50.5 50.1
Carrying amount $ 50.9 $ 50.9