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Financial Instruments Fair Value of Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified	Apr. 30, 2012	Jan. 31, 2012
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 19.8	$ 18.1
Derivative Liability, Fair Value, Gross Liability	0.4	2.2
Not Designated as Hedging Instrument [Member] \| Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	11.6	6.2
Foreign Exchange Contract [Member] \| Designated as Hedging Instrument [Member] \| Prepaid expenses and other current assets [member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	8.2	11.9
Foreign Exchange Contract [Member] \| Designated as Hedging Instrument [Member] \| Other Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 0.4	$ 2.2

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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