REVENUE RECOGNITION - CONTRACT ASSET AND LIABILITY ROLLFORWARD (Details) - USD ($) $ in Millions	12 Months Ended
Jan. 31, 2021	Jan. 31, 2020
Revenue from Contract with Customer [Abstract]
Amount reclassified to Accounts Receivable from beginning balance of Contract Asset	$ 45.6	$ 49.1
Contract Assets recognized in current period	55.1	48.8
Current period revenue recognized from beginning balance of Contract Liabilities	$ 368.8	$ 331.6

Amount of decrease in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time from transfer to receivable due to right to consideration becoming unconditional.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045

Name:	us-gaap_ContractWithCustomerAssetReclassifiedToReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration