Income Taxes Unrecognized Tax Benefits Reconciliation, Table (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross unrecognized tax benefits at the beginning of the fiscal year	$ 212.7	$ 201.1	$ 188.4
Increases for tax positions of prior years	1.8	0.4	0.4
Decreases for tax positions of prior years	(0.3)	(0.4)	(0.4)
Increases for tax positions related to the current year	15.3	17.8	14.3
Decreases for lapse of statute of limitations/audit settlements	(7.4)	(6.2)	(1.6)
Gross unrecognized tax benefits at the end of the fiscal year	$ 222.1	$ 212.7	$ 201.1

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

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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