Consolidated Statements of Stockholders' Equity - USD ($) $ 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, 2016		55,600,000
Balance, beginning of year at Oct. 31, 2016		$ 0.6	$ 248.6	$ (31.6)	$ 756.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued under employee stock purchase and share-based compensation plans (in shares)		700,000
Stock issued (taxes withheld) under employee stock purchase and share-based compensation plans		$ 0.0	(0.1)
Share-based compensation expense			13.3
Stock issued in GCA acquisition, net of shares withheld for taxes (in shares)		9,400,000
Stock issued in GCA acquisition, net of shares withheld for taxes		$ 0.1	421.3
Repurchase of common stock (in shares)	(200,000)	(200,000)
Repurchase of common stock	$ (7.9)	$ 0.0	(7.9)
Other comprehensive (loss) income				11.3
Net income	$ 3.8				3.8
Dividends
Common stock ($0.720, $0.700, and $0.680 per share)					(39.5)
Common stock, dividends (usd per share)	$ 0.680
Stock issued under share-based compensation plans					(0.6)
Balance, end of year (in shares) at Oct. 31, 2017		65,500,000
Balance, end of year at Oct. 31, 2017	$ 1,375.7	$ 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)		500,000
Stock issued (taxes withheld) under employee stock purchase and share-based compensation plans		$ 0.0	(0.4)
Share-based compensation expense			17.0
Stock issued in GCA acquisition, net of shares withheld for taxes (in shares)		0
Stock issued in GCA acquisition, net of shares withheld for taxes		$ 0.0	0.0
Repurchase of common stock (in shares)	0	0
Repurchase of common stock		$ 0.0	0.0
Other comprehensive (loss) income				11.3
Net income	$ 97.8				97.8
Dividends
Common stock ($0.720, $0.700, and $0.680 per share)					(46.0)
Common stock, dividends (usd per share)	$ 0.700
Stock issued under share-based compensation plans					(0.6)
Balance, end of year (in shares) at Oct. 31, 2018		66,000,000.0
Balance, end 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)		600,000
Stock issued (taxes withheld) under employee stock purchase and share-based compensation plans		$ 0.0	(0.3)
Share-based compensation expense			17.5
Stock issued in GCA acquisition, net of shares withheld for taxes (in shares)		0
Stock issued in GCA acquisition, net of shares withheld for taxes		$ 0.0	0.0
Repurchase of common stock (in shares)	0	0
Repurchase of common stock		$ 0.0	0.0
Other comprehensive (loss) income				(14.9)
Net income	$ 127.4				127.4
Dividends
Common stock ($0.720, $0.700, and $0.680 per share)					(47.7)
Common stock, dividends (usd per share)	$ 0.720
Stock issued under share-based compensation plans					(1.0)
Balance, end of year (in shares) at Oct. 31, 2019		66,600,000
Balance, end of year at Oct. 31, 2019	$ 1,542.0	$ 0.7	$ 708.9	$ (23.9)	$ 856.3