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	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment
Dividends
Cumulative effect adjustment for adoption of Accounting Standards Update 2014-09		$ 0.7	$ 691.8	$ (9.0)	$ 771.2
Balance, beginning of year (in shares) at Oct. 31, 2018		66.0
Balance, beginning of year at Oct. 31, 2018		$ 0.7	691.8	(9.0)	771.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued under employee stock purchase and share-based compensation plans (in shares)		0.3
Stock issued (taxes withheld) under employee stock purchase and share-based compensation plans, net		$ 0.0	0.0
Repurchase of common stock (in shares)		0.0
Repurchase of common stock		$ 0.0	0.0
Share-based compensation (reversal) expense			8.8
Other comprehensive loss				(6.7)
Net income	$ 42.7				42.7
Dividends
Common stock ($0.185, $0.180, $0.370, and $0.360 per share)					(23.8)
Stock issued under share-based compensation plans					(0.7)
Cumulative effect adjustment for adoption of Accounting Standards Update 2014-09	1,481.4	$ 0.7	700.6	(15.7)	795.9	$ 6.5
Balance, end of year (in shares) at Apr. 30, 2019		66.3
Balance, end of year at Apr. 30, 2019	1,481.4	$ 0.7	700.6	(15.7)	795.9	6.5
Dividends
Cumulative effect adjustment for adoption of Accounting Standards Update 2014-09		$ 0.7	694.1	(12.2)	778.6
Balance, beginning of year (in shares) at Jan. 31, 2019		66.2
Balance, beginning of year at Jan. 31, 2019		$ 0.7	694.1	(12.2)	778.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued under employee stock purchase and share-based compensation plans (in shares)		0.1
Stock issued (taxes withheld) under employee stock purchase and share-based compensation plans, net		$ 0.0	2.2
Repurchase of common stock (in shares)		0.0
Repurchase of common stock		$ 0.0	0.0
Share-based compensation (reversal) expense			4.3
Other comprehensive loss				(3.4)
Net income	29.7				29.7
Dividends
Common stock ($0.185, $0.180, $0.370, and $0.360 per share)					(11.9)
Stock issued under share-based compensation plans					(0.5)
Cumulative effect adjustment for adoption of Accounting Standards Update 2014-09	1,481.4	$ 0.7	700.6	(15.7)	795.9	6.5
Balance, end of year (in shares) at Apr. 30, 2019		66.3
Balance, end of year at Apr. 30, 2019	1,481.4	$ 0.7	700.6	(15.7)	795.9	6.5
Dividends
Cumulative effect adjustment for adoption of Accounting Standards Update 2014-09	1,481.4	0.7	700.6	(15.7)	795.9	$ 6.5
Cumulative effect adjustment for adoption of Accounting Standards Update 2014-09	1,542.0	$ 0.7	708.9	(23.9)	856.3
Balance, beginning of year (in shares) at Oct. 31, 2019		66.6
Balance, beginning of year at Oct. 31, 2019	$ 1,542.0	$ 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 (taxes withheld) under employee stock purchase and share-based compensation plans, net		$ 0.0	(0.9)
Repurchase of common stock (in shares)	(0.2)	(0.2)
Repurchase of common stock	$ (5.1)	$ 0.0	(5.1)
Share-based compensation (reversal) expense			4.2
Other comprehensive loss				(11.0)
Net income	(108.8)				(108.8)
Dividends
Common stock ($0.185, $0.180, $0.370, and $0.360 per share)					(24.6)
Stock issued under share-based compensation plans					(0.5)
Cumulative effect adjustment for adoption of Accounting Standards Update 2014-09	1,542.0	$ 0.7	707.1	(34.9)	722.3
Balance, end of year (in shares) at Apr. 30, 2020		66.6
Balance, end of year at Apr. 30, 2020	1,395.2	$ 0.7	707.1	(34.9)	722.3
Dividends
Cumulative effect adjustment for adoption of Accounting Standards Update 2014-09		$ 0.7	711.8	(24.3)	871.6
Balance, beginning of year (in shares) at Jan. 31, 2020		66.8
Balance, beginning of year at Jan. 31, 2020		$ 0.7	711.8	(24.3)	871.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued under employee stock purchase and share-based compensation plans (in shares)		0.0
Stock issued (taxes withheld) under employee stock purchase and share-based compensation plans, net		$ 0.0	1.1
Repurchase of common stock (in shares)		(0.2)
Repurchase of common stock		$ 0.0	(5.1)
Share-based compensation (reversal) expense			(0.7)
Other comprehensive loss				(10.5)
Net income	(136.8)				(136.8)
Dividends
Common stock ($0.185, $0.180, $0.370, and $0.360 per share)					(12.3)
Stock issued under share-based compensation plans					(0.1)
Cumulative effect adjustment for adoption of Accounting Standards Update 2014-09	1,395.2	$ 0.7	707.1	(34.9)	722.3
Balance, end of year (in shares) at Apr. 30, 2020		66.6
Balance, end of year at Apr. 30, 2020	1,395.2	$ 0.7	707.1	(34.9)	722.3
Dividends
Cumulative effect adjustment for adoption of Accounting Standards Update 2014-09	$ 1,395.2	$ 0.7	$ 707.1	$ (34.9)	$ 722.3