Auto Loan Receivables (Past Due Receivables) (Details) (USD $) In Millions, unless otherwise specified	Feb. 28, 2014		Feb. 28, 2013
Financing Receivable, Past Due [Line Items]
Total ending managed receivables	$ 7,184.4	[1]	$ 5,933.3	[1]
31-60 days past due	126.6		109.5
61-90 days past due	42.6		32.7
Greater than 90 days past due	16.0		12.0
Total past due	$ 185.2		$ 154.2
Past due receivables as a percentage of total ending managed receivables	2.60%	[2]	2.60%	[2]
Managed Receivables [Member]
Financing Receivable, Past Due [Line Items]
Item as percent of total ending managed receivables	100.00%	[2]	100.00%	[2]
31-60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past due receivables as a percentage of total ending managed receivables	1.80%	[2]	1.80%	[2]
61-90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past due receivables as a percentage of total ending managed receivables	0.60%	[2]	0.60%	[2]
Greater Than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past due receivables as a percentage of total ending managed receivables	0.20%	[2]	0.20%	[2]

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

[2] Percent of total ending managed receivables.