Business and Summary of Significant Accounting Policies - Changes In the Carrying Amount of Goodwill (Details) - USD ($)	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Accounting Policies [Abstract]
Impairment of goodwill	$ 0	$ 0	$ 0
Goodwill [Roll Forward]
Goodwill, beginning of period, gross		2,855,700,000	2,594,200,000
Less: accumulated impairment losses, beginning of the year		(149,200,000)	$ (149,200,000)
Additions arising from acquisitions during the year	936,200,000	220,800,000
Effect of foreign currency translation, measurement period adjustments and other	(38,900,000)	40,700,000
Goodwill, end of period, net	$ 3,603,800,000	$ 2,706,500,000