Auto Loan Receivables (Ending Managed Receivables By Major Credit Grade) (Details) (USD $)
In Millions, unless otherwise specified
May 31, 2014
Feb. 28, 2014
Financing Receivable, By Major Credit Grade [Line Items]    
Total ending managed receivables $ 7,573.8 [1],[2] $ 7,184.4 [1],[2]
Total ending managed receivables as percentage by major credit grade 100.00% [3] 100.00% [3]
Credit Grade A [Member]
    
Financing Receivable, By Major Credit Grade [Line Items]    
Total ending managed receivables 3,698.6 [2] 3,506.0 [2]
Total ending managed receivables as percentage by major credit grade 48.80% [3] 48.80% [3]
Credit Grade B [Member]
    
Financing Receivable, By Major Credit Grade [Line Items]    
Total ending managed receivables 2,786.9 [2] 2,658.5 [2]
Total ending managed receivables as percentage by major credit grade 36.80% [3] 37.00% [3]
Credit Grade C And Other [Member]
    
Financing Receivable, By Major Credit Grade [Line Items]    
Total ending managed receivables $ 1,088.3 [2] $ 1,019.9 [2]
Total ending managed receivables as percentage by major credit grade 14.40% [3] 14.20% [3]
[1] Other receivables includes receivables not funded through the warehouse facilities or term securitizations.
[2] Classified based on credit grade assigned when customers were initially approved for financing.
[3] Percentage of total ending managed receivables.