Auto Loan Receivables (Ending Managed Receivables By Major Credit Grade) (Details) - USD ($)
$ in Millions
May. 31, 2015
Feb. 28, 2015
Financing Receivable, By Major Credit Grade [Line Items]    
Total ending managed receivables [1],[2] $ 8,862.6 $ 8,458.7
Total ending managed receivables as percentage by major credit grade [3] 100.00% 100.00%
Credit Grade A [Member]    
Financing Receivable, By Major Credit Grade [Line Items]    
Total ending managed receivables [1] $ 4,301.7 $ 4,135.6
Total ending managed receivables as percentage by major credit grade [3] 48.50% 48.90%
Credit Grade B [Member]    
Financing Receivable, By Major Credit Grade [Line Items]    
Total ending managed receivables [1] $ 3,201.2 $ 3,055.3
Total ending managed receivables as percentage by major credit grade [3] 36.10% 36.10%
Credit Grade C And Other [Member]    
Financing Receivable, By Major Credit Grade [Line Items]    
Total ending managed receivables [1] $ 1,359.7 $ 1,267.8
Total ending managed receivables as percentage by major credit grade [3] 15.40% 15.00%
[1] Classified based on credit grade assigned when customers were initially approved for financing.
[2] Other receivables includes receivables not funded through the warehouse facilities or term securitizations.
[3] Percent of total ending managed receivables.