Summary of Significant Accounting Policies - Deferred Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020	Jan. 31, 2021
Accounting Policies [Abstract]
Contract with customer liability	$ 121.2		$ 121.2		$ 89.8
Contract with customer liability, revenue recognized	$ 9.2	$ 7.5	$ 31.8	$ 24.9