Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at November 1	$ 29.7	$ 29.6	$ 34.3
Increases in tax positions for prior years	2.1	5.7	8.5
Decreases in tax positions for prior years	(1.8)	(10.5)	(2.2)
Increases in tax positions for current years	6.7	6.9	6.2
Settlements with taxing authorities	(7.4)	0.0	(5.7)
Lapse in statute of limitations	(4.6)	(2.6)	(6.2)
Currency translation	2.1	0.6	(5.3)
Balance at October 31	$ 26.8	$ 29.7	$ 29.6