CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss, Net of Taxes	Retained Earnings
Balance, beginning of period (in shares) at Oct. 31, 2021		67,300,000
Balance, beginning of period at Oct. 31, 2021		$ 0.7	$ 750.9	$ (22.5)	$ 880.2
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, net		$ 0.0	(8.1)
Repurchase of common stock (in shares)		(1,000,000.0)
Share-based compensation expense			16.8
Repurchase of common stock		$ 0.0	(43.3)
Other comprehensive income (loss)				(2.6)
Net income	$ 124.8				124.8
Dividends
Common stock ($0.220 and $0.195 per share)					(26.2)
Stock issued under share-based compensation plans					(1.1)
Balance, end of period (in shares) at Apr. 30, 2022		66,800,000
Balance, end of period at Apr. 30, 2022	1,669.6	$ 0.7	716.4	(25.2)	977.7
Balance, beginning of period (in shares) at Jan. 31, 2022		67,400,000
Balance, beginning of period at Jan. 31, 2022		$ 0.7	737.0	(24.6)	942.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued under employee stock purchase and share-based compensation plans (in shares)		0
Stock issued (taxes withheld) under employee stock purchase and share-based compensation plans, net		$ 0.0	1.0
Repurchase of common stock (in shares)		(700,000)
Share-based compensation expense			8.4
Repurchase of common stock		$ 0.0	(30.0)
Other comprehensive income (loss)				(0.6)
Net income	48.8				48.8
Dividends
Common stock ($0.220 and $0.195 per share)					(13.0)
Stock issued under share-based compensation plans					(0.2)
Balance, end of period (in shares) at Apr. 30, 2022		66,800,000
Balance, end of period at Apr. 30, 2022	1,669.6	$ 0.7	716.4	(25.2)	977.7
Balance, beginning of period (in shares) at Oct. 31, 2022		65,600,000
Balance, beginning of period at Oct. 31, 2022	$ 1,717.2	$ 0.7	675.5	(16.2)	1,057.2
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, net		$ 0.0	(10.9)
Repurchase of common stock (in shares)	0	0
Share-based compensation expense			14.6
Repurchase of common stock		$ 0.0	0.0
Other comprehensive income (loss)				1.6
Net income	$ 90.4				90.4
Dividends
Common stock ($0.220 and $0.195 per share)					(29.0)
Stock issued under share-based compensation plans					(1.1)
Balance, end of period (in shares) at Apr. 30, 2023		66,100,000
Balance, end of period at Apr. 30, 2023	$ 1,782.8	$ 0.7	679.2	(14.6)	1,117.5
Balance, beginning of period (in shares) at Jan. 31, 2023		66,100,000
Balance, beginning of period at Jan. 31, 2023		$ 0.7	670.7	(15.1)	1,080.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued under employee stock purchase and share-based compensation plans (in shares)		0
Stock issued (taxes withheld) under employee stock purchase and share-based compensation plans, net		$ 0.0	0.8
Repurchase of common stock (in shares)	0	0
Share-based compensation expense			7.7
Repurchase of common stock		$ 0.0	0.0
Other comprehensive income (loss)				0.5
Net income	$ 51.9				51.9
Dividends
Common stock ($0.220 and $0.195 per share)					(14.5)
Stock issued under share-based compensation plans					(0.2)
Balance, end of period (in shares) at Apr. 30, 2023		66,100,000
Balance, end of period at Apr. 30, 2023	$ 1,782.8	$ 0.7	$ 679.2	$ (14.6)	$ 1,117.5