Business and Summary of Significant Accounting Policies - Accounts Receivable, Net (Details) - USD ($) $ in Millions	Jan. 31, 2021	Jan. 31, 2020
Accounting Policies [Abstract]
Trade accounts receivable	$ 701.3	$ 716.1
Less: Allowance for credit losses	(3.8)	(4.9)
Product returns reserve	(0.7)	(0.5)
Partner programs and other obligations	(53.7)	(58.4)
Accounts receivable, net	$ 643.1	$ 652.3