FINANCIAL STATEMENT SCHEDULE II (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Partner Program reserves
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the Beginning of Year	$ 60.4	$ 51.7	$ 36.5
Additions Charged to Costs and Expenses or Revenues	491.9	453.7	294.7
Deductions and Write-Offs	488.3	445.0	279.5
Balance at End of Year	64.0	60.4	51.7
Restructuring and other facility exit costs
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the Beginning of Year	$ 0.0	2.1	57.2
Additions Charged to Costs and Expenses or Revenues		0.3	41.9
Deductions and Write-Offs		2.4	97.0
Balance at End of Year		$ 0.0	$ 2.1