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Auto Loan Receivables (Past Due Receivables) (Details) - USD ($)
$ in Millions
Feb. 28, 2021
Feb. 29, 2020
Financing Receivable, Past Due [Line Items]    
Total ending managed receivables $ 13,847.2 $ 13,617.8
Total past due $ 392.5 $ 468.9
Past due receivables as a percentage of total ending managed receivables 2.83% 3.44%
Financing Receivable, before Allowance for Credit Loss, Current $ 13,454.7  
Credit Grade A [Member]    
Financing Receivable, Past Due [Line Items]    
Total ending managed receivables 6,874.1 $ 6,915.9
Total past due 26.9  
Financing Receivable, before Allowance for Credit Loss, Current 6,847.2  
Credit Grade B    
Financing Receivable, Past Due [Line Items]    
Total ending managed receivables 5,008.9 4,841.2
Total past due 168.6  
Financing Receivable, before Allowance for Credit Loss, Current 4,840.3  
Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Total ending managed receivables 1,964.2 $ 1,860.7
Total past due 197.0  
Financing Receivable, before Allowance for Credit Loss, Current $ 1,767.2  
Managed Receivables    
Financing Receivable, Past Due [Line Items]    
Item as percent of total ending managed receivables 100.00% 100.00%
Thirty One To Sixty Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Total past due $ 246.2 $ 296.4
Past due receivables as a percentage of total ending managed receivables 1.78% 2.18%
Thirty One To Sixty Days Past Due [Member] | Credit Grade A [Member]    
Financing Receivable, Past Due [Line Items]    
Total past due $ 17.3  
Thirty One To Sixty Days Past Due [Member] | Credit Grade B    
Financing Receivable, Past Due [Line Items]    
Total past due 108.9  
Thirty One To Sixty Days Past Due [Member] | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Total past due 120.0  
Sixty One To Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Total past due $ 119.9 $ 138.3
Past due receivables as a percentage of total ending managed receivables 0.86% 1.01%
Sixty One To Ninety Days Past Due [Member] | Credit Grade A [Member]    
Financing Receivable, Past Due [Line Items]    
Total past due $ 7.0  
Sixty One To Ninety Days Past Due [Member] | Credit Grade B    
Financing Receivable, Past Due [Line Items]    
Total past due 48.4  
Sixty One To Ninety Days Past Due [Member] | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Total past due 64.5  
Greater Than Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Total past due $ 26.4 $ 34.2
Past due receivables as a percentage of total ending managed receivables 0.19% 0.25%
Greater Than Ninety Days Past Due [Member] | Credit Grade A [Member]    
Financing Receivable, Past Due [Line Items]    
Total past due $ 2.6  
Greater Than Ninety Days Past Due [Member] | Credit Grade B    
Financing Receivable, Past Due [Line Items]    
Total past due 11.3  
Greater Than Ninety Days Past Due [Member] | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Total past due $ 12.5  
Financial Asset, 1 to 29 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due receivables as a percentage of total ending managed receivables 97.17%