Income Taxes (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 29, 2012
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance as of March 1	$ 100.6	$ 92.0	$ 154.4
Increases as a result of tax positions taken during a prior period	2.3	1.3	11.0
Decreases as a result of tax positions taken during a prior period	(3.3)	(9.5)	(37.0)
Increases as a result of tax positions taken during the current period	11.1	19.5	29.4
Decreases related to settlements with tax authorities	(6.7)	(0.3)	(59.5)
Decreases related to lapse of applicable statute of limitations	(2.5)	(2.4)	(6.3)
Balance as of last day of February	$ 101.5	$ 100.6	$ 92.0