Income Taxes Income Tax (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012
Income Tax Disclosure [Abstract]
Effective Income Tax Rate, Continuing Operations	25.00%	30.00%	24.00%	24.00%
Effective Tax Rate - Increase/Decrease in the effective tax rate	5.00%
Effective tax rate excluding the impact of discrete tax items	23.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%
Unrecognized Tax Benefits (in usd)	$ 219.6		$ 219.6
Unrecognized Tax Benefits that Would Impact Effective Tax Rate (in usd)	210.2		210.2
Deferred Tax Assets, Net (in usd)	$ 176.9		$ 176.9

Effective Income Tax Rate

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- Definition

Effective Tax Rate - Increase/Decrease in the effective tax rate

+ References

No definition available.

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- Definition

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB

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-Name Accounting Standards Codification

-Topic 235

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-Section S99

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-Subparagraph (SX 210.4-08.(h)(2))

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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-Subparagraph (SAB TOPIC 6.I)

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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