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Financial Instruments Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Jan. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 9.8		$ 10.0
Derivative Liabilities	10.7		17.5
Foreign exchange contracts \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Amount of gain recognized in accumulated other comprehensive loss on derivatives (effective portion)	6.1	$ 5.1
Amount of gain (loss) reclassified from accumulated other comprehensive loss into income (loss) (effective portion)	(3.9)	1.2
Foreign exchange contracts \| Designated as Hedging Instrument \| Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	6.1		4.7
Foreign exchange contracts \| Designated as Hedging Instrument \| Other accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	6.3		16.5
Foreign exchange contracts \| Derivatives not designated as hedging instruments \| Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	3.7		5.3
Foreign exchange contracts \| Derivatives not designated as hedging instruments \| Other accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	4.4		$ 1.0
Net revenue \| Foreign exchange contracts \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Amount of gain (loss) reclassified from accumulated other comprehensive loss into income (loss) (effective portion)	(5.5)	2.7
Cost of revenue \| Foreign exchange contracts \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Amount of gain (loss) reclassified from accumulated other comprehensive loss into income (loss) (effective portion)	0.3	(0.2)
Operating expenses \| Foreign exchange contracts \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Amount of gain (loss) reclassified from accumulated other comprehensive loss into income (loss) (effective portion)	1.3	(1.3)
Interest and other expense, net \| Foreign exchange contracts \| Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Amount and location of gain (loss) recognized on derivatives in net income	$ 6.9	$ (1.0)