Revenue from Contracts with Customers - Deferred Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Revenue from External Customer [Line Items]
Deferred revenue	$ 388.6
Subscription
Revenue from External Customer [Line Items]
Revenue recognized included in deferred revenue	216.6	$ 155.2	$ 93.0
Deferred revenue	383.1
Professional services
Revenue from External Customer [Line Items]
Revenue recognized included in deferred revenue	4.8	$ 3.4	$ 2.1
Deferred revenue	$ 5.5