Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive (Loss) Income, Net of Taxes	Retained Earnings
Balance, beginning of year (in shares) at Oct. 31, 2017		65.5
Balance, beginning of year at Oct. 31, 2017		$ 0.7	$ 675.2	$ (20.3)	$ 720.1
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, net		$ 0.0	0.2
Share-based compensation expense			13.1
Other comprehensive (loss) income				14.6
Net income	$ 88.1				88.1
Dividends
Common stock ($0.180, $0.175, $0.540, and $0.525 per share)					(34.5)
Stock issued under share-based compensation plans					(0.5)
Balance, end of year (in shares) at Jul. 31, 2018		65.8
Balance, end of year at Jul. 31, 2018	1,456.4	$ 0.7	688.3	(5.7)	773.2
Balance, beginning of year (in shares) at Apr. 30, 2018		65.7
Balance, beginning of year at Apr. 30, 2018		$ 0.7	683.1	1.6	751.2
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	0.5
Share-based compensation expense			4.8
Other comprehensive (loss) income				(7.4)
Net income	33.6				33.6
Dividends
Common stock ($0.180, $0.175, $0.540, and $0.525 per share)					(11.5)
Stock issued under share-based compensation plans					(0.1)
Balance, end of year (in shares) at Jul. 31, 2018		65.8
Balance, end of year at Jul. 31, 2018	1,456.4	$ 0.7	688.3	(5.7)	773.2
Balance, beginning of year (in shares) at Oct. 31, 2018		66.0
Balance, beginning of year at Oct. 31, 2018	1,454.6	$ 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
Other comprehensive (loss) income				(15.4)
Net income	79.4				79.4
Dividends
Common stock ($0.180, $0.175, $0.540, and $0.525 per share)					(35.8)
Stock issued under share-based compensation plans					(0.8)
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
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
Other comprehensive (loss) income				(8.7)
Net income	36.8				36.8
Dividends
Common stock ($0.180, $0.175, $0.540, and $0.525 per share)					(11.9)
Stock issued under share-based compensation plans					(0.1)
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