Auto Loan Receivables (Ending Managed Receivables By Major Credit Grade) (Details) (USD $) In Millions, unless otherwise specified	Feb. 28, 2014		Feb. 28, 2013
Financing Receivable, By Major Credit Grade [Line Items]
Total ending managed receivables	$ 7,184.4	[1]	$ 5,933.3	[1]
Total ending managed receivables as percentage by major credit grade	100.00%	[2]	100.00%	[2]
Credit Grade A [Member]
Financing Receivable, By Major Credit Grade [Line Items]
Total ending managed receivables	3,506.0	[1]	2,841.4	[1]
Total ending managed receivables as percentage by major credit grade	48.80%	[2]	47.90%	[2]
Credit Grade B [Member]
Financing Receivable, By Major Credit Grade [Line Items]
Total ending managed receivables	2,658.5	[1]	2,265.6	[1]
Total ending managed receivables as percentage by major credit grade	37.00%	[2]	38.20%	[2]
Credit Grade C And Other [Member]
Financing Receivable, By Major Credit Grade [Line Items]
Total ending managed receivables	$ 1,019.9	[1]	$ 826.3	[1]
Total ending managed receivables as percentage by major credit grade	14.20%	[2]	13.90%	[2]

[1] Classified based on credit grade assigned when customers were initially approved for financing.

[2] Percent of total ending managed receivables.