Net (Loss) Income Per Common Share - Calculations of Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Schedule of Earnings Per Share, Basic and Diluted, by Common Class
Income from continuing operations	$ 16.1	$ 13.6
Net (loss) income from discontinued operations	(72.9)	0.4
Net (loss) income	$ (56.8)	$ 14.0
Weighted-average common and common equivalent shares outstanding-Basic (in shares)	56.0	56.6
Effect of dilutive securities
Weighted-average common and common equivalent shares outstanding-Diluted (in shares)	56.6	57.1
Net (loss) income per common share — Basic
Income from continuing operations (in dollars per share)	$ 0.29	$ 0.24
(Loss) income from discontinued operations (in dollars per share)	(1.30)	0.01
Net (loss) income (in dollars per share)	(1.01)	0.25
Net (loss) income per common share — Diluted
Income from continuing operations (in dollars per share)	0.28	0.24
Loss from discontinued operations (in dollars per share)	(1.28)	0.00
Net (loss) income (in dollars per share)	$ (1.00)	$ 0.24
Restricted stock units
Effect of dilutive securities
Effect of dilutive securities (in shares)	0.3	0.2
Stock options
Effect of dilutive securities
Effect of dilutive securities (in shares)	0.2	0.2
Performance shares
Effect of dilutive securities
Effect of dilutive securities (in shares)	0.1	0.1