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Income Taxes - Reconciliation of Total Unrecognized Tax Benefits (Detail) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance $ 85.5 $ 87.6 $ 88.4
Additions for tax positions related to the current year 2.1 1.4 1.7
Reductions for tax positions related to the current year 0.0 0.0 (0.6)
Additions for tax positions related to prior years 0.1 0.0 0.6
Reductions for tax positions related to prior years 0.0 0.0 (0.1)
Reductions for expiration of statute of limitations (5.2) (3.2) (1.5)
Settlements 0.0 (0.3) (0.9)
Ending Balance $ 82.5 $ 85.5 $ 87.6