v3.26.1
Auto Loan Receivables (Past Due Receivables) (Details) - USD ($)
$ in Millions
Feb. 28, 2026
Feb. 28, 2025
Financing Receivable, Past Due [Line Items]    
Auto loans held for investment $ 16,271.9 $ 17,594.6
Past due receivables as a percentage of total ending managed receivables 5.11% 4.85%
Financing Receivable, before Allowance for Credit Loss, Current $ 15,441.1 $ 16,740.7
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 830.8 $ 853.9
Managed Receivables    
Financing Receivable, Past Due [Line Items]    
Item as percent of total ending managed receivables 100.00% 100.00%
Tier 1 managed receivables    
Financing Receivable, Past Due [Line Items]    
Auto loans held for investment $ 15,721.5 $ 16,930.3
Financing Receivable, before Allowance for Credit Loss, Current 15,005.4 16,199.5
Financing Receivable, before Allowance for Credit Loss, Noncurrent 716.1 730.8
Tier 1 managed receivables | Credit Grade A [Member]    
Financing Receivable, Past Due [Line Items]    
Auto loans held for investment 9,473.9 9,600.7
Financing Receivable, before Allowance for Credit Loss, Current 9,414.1 9,543.3
Financing Receivable, before Allowance for Credit Loss, Noncurrent 59.8 57.4
Tier 1 managed receivables | Credit Grade B    
Financing Receivable, Past Due [Line Items]    
Auto loans held for investment 5,056.8 5,929.1
Financing Receivable, before Allowance for Credit Loss, Current 4,614.4 5,491.5
Financing Receivable, before Allowance for Credit Loss, Noncurrent 442.4 437.6
Tier 1 managed receivables | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Auto loans held for investment 1,190.8 1,400.5
Financing Receivable, before Allowance for Credit Loss, Current 976.9 1,164.7
Financing Receivable, before Allowance for Credit Loss, Noncurrent 213.9 235.8
Tier 2 & Tier 3 managed receivables | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Auto loans held for investment 550.4 664.3
Financing Receivable, before Allowance for Credit Loss, Current 435.7 541.2
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 114.7 $ 123.1
Thirty One To Sixty Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Past due receivables as a percentage of total ending managed receivables 2.96% 2.98%
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 481.8 $ 523.9
Thirty One To Sixty Days Past Due [Member] | Tier 1 managed receivables    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 419.3 452.0
Thirty One To Sixty Days Past Due [Member] | Tier 1 managed receivables | Credit Grade A [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 38.3 36.7
Thirty One To Sixty Days Past Due [Member] | Tier 1 managed receivables | Credit Grade B    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 264.8 276.0
Thirty One To Sixty Days Past Due [Member] | Tier 1 managed receivables | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 116.2 139.3
Thirty One To Sixty Days Past Due [Member] | Tier 2 & Tier 3 managed receivables | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 62.5 $ 71.9
Sixty One To Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Past due receivables as a percentage of total ending managed receivables 1.74% 1.49%
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 282.7 $ 262.9
Sixty One To Ninety Days Past Due [Member] | Tier 1 managed receivables    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 238.8 221.7
Sixty One To Ninety Days Past Due [Member] | Tier 1 managed receivables | Credit Grade A [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 15.5 14.8
Sixty One To Ninety Days Past Due [Member] | Tier 1 managed receivables | Credit Grade B    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 142.1 127.3
Sixty One To Ninety Days Past Due [Member] | Tier 1 managed receivables | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 81.2 79.6
Sixty One To Ninety Days Past Due [Member] | Tier 2 & Tier 3 managed receivables | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 43.9 $ 41.2
Greater Than Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Past due receivables as a percentage of total ending managed receivables 0.41% 0.38%
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 66.3 $ 67.1
Greater Than Ninety Days Past Due [Member] | Tier 1 managed receivables    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 58.0 57.1
Greater Than Ninety Days Past Due [Member] | Tier 1 managed receivables | Credit Grade A [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 6.0 5.9
Greater Than Ninety Days Past Due [Member] | Tier 1 managed receivables | Credit Grade B    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 35.5 34.3
Greater Than Ninety Days Past Due [Member] | Tier 1 managed receivables | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 16.5 16.9
Greater Than Ninety Days Past Due [Member] | Tier 2 & Tier 3 managed receivables | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 8.3 $ 10.0
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 94.89% 95.15%