Auto Loan Receivables (Allowance For Loan Losses) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2012 Allowance For Loan Losses [Member]		May 31, 2012 Allowance For Loan Losses [Member]		Feb. 29, 2012 Allowance For Loan Losses [Member]		Aug. 31, 2011 Allowance For Loan Losses [Member]		May 31, 2011 Allowance For Loan Losses [Member]		Feb. 28, 2011 Allowance For Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance as of beginning of period	$ 46.6	$ 34.3	$ 43.3	$ 38.9
Charge-offs	(24.3)	(23.2)	(44.9)	(42.5)
Recoveries	14.3	14.3	29.0	30.0
Provision for loan losses	12.9	10.8	22.1	9.8
Balance as of end of period	$ 49.5	$ 36.2	$ 49.5	$ 36.2
Item as percent of total ending managed receivables					0.90%	[1]	0.90%	[1]	0.90%	[1]	0.80%	[1]	0.80%	[1]	0.90%	[1]

[1] Percent of total ending managed receivables as of the corresponding reporting date.