Share-based Compensation Plans - Classification of Share-based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation	$ 26.2	$ 25.4	$ 26.6
Technology
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation	5.5	5.9	4.2
Marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation	0.2	0.5	1.0
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation	$ 20.5	$ 19.0	$ 21.4

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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