Income Taxes (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2011
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance as of March 1	$ 92.0	$ 154.4	$ 124.0
Increases as a result of tax positions taken during a prior period	1.3	11.0	9.5
Decreases as a result of tax positions taken during a prior period	(9.5)	(37.0)	(1.8)
Increases as a result of tax positions taken during the current period	19.5	29.4	59.5
Decreases related to settlements with tax authorities	(0.3)	(59.5)	(36.0)
Decreases related to lapse of applicable statute of limitations	(2.4)	(6.3)	(0.8)
Balance as of last day of February	$ 100.6	$ 92.0	$ 154.4

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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