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)		0.4
Stock issued under employee stock purchase and share-based compensation plans, net		$ 0.0	1.5
Share-based compensation expense			13.6
Repurchase of common stock (in shares)		0.0
Repurchase of common stock		$ 0.0	0.0
Other comprehensive income (loss)				(15.4)
Net income (loss)	$ 79.4				79.4
Dividends
Common stock ($0.185, $0.180, $0.555, and $0.540 per share)					(35.8)
Stock issued under share-based compensation plans					(0.8)
Cumulative effect adjustment for adoption of Accounting Standards Update 2014-09	1,503.6	$ 0.7	706.9	(24.4)	820.5	$ 6.5
Balance, end of year (in shares) at Jul. 31, 2019		66.4
Balance, end of year at Jul. 31, 2019	1,503.6	$ 0.7	706.9	(24.4)	820.5	6.5
Dividends
Cumulative effect adjustment for adoption of Accounting Standards Update 2014-09		$ 0.7	700.6	(15.7)	795.9
Balance, beginning of year (in shares) at Apr. 30, 2019		66.3
Balance, beginning of year at Apr. 30, 2019		$ 0.7	700.6	(15.7)	795.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued under employee stock purchase and share-based compensation plans (in shares)		0.1
Stock issued under employee stock purchase and share-based compensation plans, net		$ 0.0	1.5
Share-based compensation expense			4.8
Repurchase of common stock (in shares)		0.0
Repurchase of common stock		$ 0.0	0.0
Other comprehensive income (loss)				(8.7)
Net income (loss)	36.8				36.8
Dividends
Common stock ($0.185, $0.180, $0.555, and $0.540 per share)					(11.9)
Stock issued under share-based compensation plans					(0.1)
Cumulative effect adjustment for adoption of Accounting Standards Update 2014-09	1,503.6	$ 0.7	706.9	(24.4)	820.5	6.5
Balance, end of year (in shares) at Jul. 31, 2019		66.4
Balance, end of year at Jul. 31, 2019	1,503.6	$ 0.7	706.9	(24.4)	820.5	6.5
Dividends
Cumulative effect adjustment for adoption of Accounting Standards Update 2014-09	1,503.6	0.7	706.9	(24.4)	820.5	$ 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 under employee stock purchase and share-based compensation plans, net		$ 0.0	0.0
Share-based compensation expense			11.1
Repurchase of common stock (in shares)	(0.2)	(0.2)
Repurchase of common stock	$ (5.1)	$ 0.0	(5.1)
Other comprehensive income (loss)				(6.2)
Net income (loss)	(52.8)				(52.8)
Dividends
Common stock ($0.185, $0.180, $0.555, and $0.540 per share)					(37.0)
Stock issued under share-based compensation plans					(0.6)
Cumulative effect adjustment for adoption of Accounting Standards Update 2014-09	1,542.0	$ 0.7	714.9	(30.1)	765.9
Balance, end of year (in shares) at Jul. 31, 2020		66.7
Balance, end of year at Jul. 31, 2020	1,451.3	$ 0.7	714.9	(30.1)	765.9
Dividends
Cumulative effect adjustment for adoption of Accounting Standards Update 2014-09		$ 0.7	707.1	(34.9)	722.3
Balance, beginning of year (in shares) at Apr. 30, 2020		66.6
Balance, beginning of year at Apr. 30, 2020		$ 0.7	707.1	(34.9)	722.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued under employee stock purchase and share-based compensation plans (in shares)		0.0
Stock issued under employee stock purchase and share-based compensation plans, net		$ 0.0	0.9
Share-based compensation expense			6.9
Repurchase of common stock (in shares)		0.0
Repurchase of common stock		$ 0.0	0.0
Other comprehensive income (loss)				4.8
Net income (loss)	56.0				56.0
Dividends
Common stock ($0.185, $0.180, $0.555, and $0.540 per share)					(12.3)
Stock issued under share-based compensation plans					(0.1)
Cumulative effect adjustment for adoption of Accounting Standards Update 2014-09	1,451.3	$ 0.7	714.9	(30.1)	765.9
Balance, end of year (in shares) at Jul. 31, 2020		66.7
Balance, end of year at Jul. 31, 2020	1,451.3	$ 0.7	714.9	(30.1)	765.9
Dividends
Cumulative effect adjustment for adoption of Accounting Standards Update 2014-09	$ 1,451.3	$ 0.7	$ 714.9	$ (30.1)	$ 765.9