Auto Loan Receivables (Past Due Receivables) (Details) - USD ($)
$ in Millions
May. 31, 2015
Feb. 28, 2015
Financing Receivable, Past Due [Line Items]    
Total ending managed receivables [1],[2] $ 8,862.6 $ 8,458.7
31-60 days past due 161.1 152.1
61-90 days past due 56.1 52.5
Greater than 90 days past due 17.2 16.8
Total past due $ 234.4 $ 221.4
Past due receivables as a percentage of total ending managed receivables [3] 2.60% 2.60%
Managed Receivables [Member]    
Financing Receivable, Past Due [Line Items]    
Item as percent of total ending managed receivables [3] 100.00% 100.00%
31-60 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Past due receivables as a percentage of total ending managed receivables [3] 1.80% 1.80%
61-90 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Past due receivables as a percentage of total ending managed receivables [3] 0.60% 0.60%
Greater Than 90 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Past due receivables as a percentage of total ending managed receivables [3] 0.20% 0.20%
[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] (1) Percent of total ending managed receivables.