Income Tax Income Tax (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended	6 Months Ended
Jul. 31, 2014	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Income Tax Disclosure [Abstract]
Effective tax rate		27.00%	25.00%	24.00%	24.00%
Increase in effective tax rate		2.00%		0.00%
Effective tax rate excluding the impact of discrete tax items		29.00%		29.00%
Federal statutory rate				35.00%
Unrecognized tax benefits		$ 233.5		$ 233.5
Unrecognized tax benefits that would impact effective tax rate		228.4		228.4
Deferred tax assets, net		163.1		163.1
Reduction in deferred tax assets	$ 41.4

Effective Income Tax Rate

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- Definition

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

+ References

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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

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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

-Name Accounting Standards Codification

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-Topic 235

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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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-Section S99

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-Subparagraph (SAB TOPIC 6.I)

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- Definition

The increase (decrease) during the reporting period in the account that represents the temporary difference that results from Income or Loss that is recognized for accounting purposes but not for tax purposes and vice versa.

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-Topic 230

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

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-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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