Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss, Net of Taxes	Retained Earnings
Balance, beginning of year (in shares) at Oct. 31, 2019		66.6
Balance, beginning of year at Oct. 31, 2019		$ 0.7	$ 708.9	$ (23.9)	$ 856.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued under employee stock purchase and share-based compensation plans (in shares)		0.2
Stock issued under employee stock purchase and share-based compensation plans		$ 0.0	(2.0)
Share-based compensation expense			4.9
Other comprehensive income (loss)				(0.4)
Net income	$ 28.0				28.0
Dividends
Common stock ($0.190 and $0.185 per share)					(12.3)
Stock issued under share-based compensation plans					(0.4)
Balance, end of year (in shares) at Jan. 31, 2020		66.8
Balance, end of year at Jan. 31, 2020	1,559.7	$ 0.7	711.8	(24.3)	871.6
Balance, beginning of year (in shares) at Oct. 31, 2020		66.7
Balance, beginning of year at Oct. 31, 2020	1,500.3	$ 0.7	724.1	(30.8)	806.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued under employee stock purchase and share-based compensation plans (in shares)		0.3
Stock issued under employee stock purchase and share-based compensation plans		$ 0.0	(5.6)
Share-based compensation expense			8.5
Other comprehensive income (loss)				4.9
Net income	74.6				74.6
Dividends
Common stock ($0.190 and $0.185 per share)					(12.7)
Stock issued under share-based compensation plans					(0.9)
Balance, end of year (in shares) at Jan. 31, 2021		67.1
Balance, end of year at Jan. 31, 2021	$ 1,569.1	$ 0.7	$ 726.9	$ (25.9)	$ 867.5