Auto Loan Receivables (Allowance For Loan Losses) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2013 Allowance For Loan Losses [Member]		Aug. 31, 2013 Allowance For Loan Losses [Member]		Feb. 28, 2013 Allowance For Loan Losses [Member]		Nov. 30, 2012 Allowance For Loan Losses [Member]		Aug. 31, 2012 Allowance For Loan Losses [Member]		Feb. 29, 2012 Allowance For Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance as of beginning of period	$ 65.9	$ 49.5	$ 57.3	$ 43.3
Charge-offs	(36.3)	(28.2)	(94.5)	(73.1)
Recoveries	18.6	14.9	56.1	43.9
Provision for loan losses	(19.7)	(18.1)	(49.0)	(40.2)
Balance as of end of period	$ 67.9	$ 54.3	$ 67.9	$ 54.3
Item as percent of total ending managed receivables					1.00%	[1]	1.00%	[1]	1.00%	[1]	1.00%	[1]	0.90%	[1]	0.90%	[1]

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