Financial Instruments- Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions	12 Months Ended
Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 10.0	$ 9.4
Derivative Liabilities	17.5	4.7
Foreign currency contracts \| Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Amount of (loss) gain recognized in accumulated other comprehensive loss on derivatives (effective portion)	(28.1)	3.0	$ 19.6
Amount and location of (loss) gain reclassified from accumulated other comprehensive loss into income (loss) (effective portion)	4.4	9.6	(12.1)
Foreign currency contracts \| Designated as hedging instrument \| Net revenue
Derivatives, Fair Value [Line Items]
Amount and location of (loss) gain reclassified from accumulated other comprehensive loss into income (loss) (effective portion)	(0.3)	17.6	(8.5)
Foreign currency contracts \| Designated as hedging instrument \| Cost of other revenue
Derivatives, Fair Value [Line Items]
Amount and location of (loss) gain reclassified from accumulated other comprehensive loss into income (loss) (effective portion)	0.6	(0.9)	0.0
Foreign currency contracts \| Designated as hedging instrument \| Operating expenses
Derivatives, Fair Value [Line Items]
Amount and location of (loss) gain reclassified from accumulated other comprehensive loss into income (loss) (effective portion)	4.1	(7.1)	(3.6)
Foreign currency contracts \| Not Designated as Hedging Instrument \| Interest and other expense, net
Derivatives, Fair Value [Line Items]
Amount and location of (loss) gain recognized on derivatives in net income (loss)	(0.8)	6.0	$ 6.6
Prepaid expenses and other current assets \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Assets	5.3	8.4
Prepaid expenses and other current assets \| Foreign currency contracts \| Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivative Assets	4.7	1.0
Other accrued liabilities \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Liabilities	1.0	1.9
Other accrued liabilities \| Foreign currency contracts \| Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivative Liabilities	$ 16.5	$ 2.8

Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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