Amount of lease cost recognized by lessee for lease contract.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971

Name:	us-gaap_LeaseCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Leases - Lease cost (Details) - USD ($) $ in Millions	12 Months Ended
Leases - Lease cost (Details) - USD ($) $ in Millions	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Lease, Cost [Abstract]
Lease costs			$ 98.4
Selling, general and administrative expenses
Lease, Cost [Abstract]
Lease costs	$ 55.7	$ 92.4