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Auto Loans Held for Investment (Past Due Receivables) (Details) - USD ($)
$ in Millions
Nov. 30, 2025
Feb. 28, 2025
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Current $ 15,635.5 $ 16,740.7
Past due receivables as a percentage of total auto loans held for investment 5.43% 4.85%
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 898.3 $ 853.9
Financing Receivable, before Allowance for Credit Loss $ 16,533.8 $ 17,594.6
Item As A Percent Of Total Auto Loans Held for Investment 100.00% 100.00%
One to Thirty Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due receivables as a percentage of total auto loans held for investment 94.57% 95.15%
Thirty One To Sixty Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Past due receivables as a percentage of total auto loans held for investment 3.03% 2.98%
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 500.4 $ 523.9
Sixty One To Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Past due receivables as a percentage of total auto loans held for investment 1.99% 1.49%
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 328.4 $ 262.9
Greater Than Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Past due receivables as a percentage of total auto loans held for investment 0.41% 0.38%
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 69.5 $ 67.1
Tier 1    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Current 15,192.0 16,199.5
Financing Receivable, before Allowance for Credit Loss, Noncurrent 773.9 730.8
Financing Receivable, before Allowance for Credit Loss 15,965.9 16,930.3
Tier 1 | Thirty One To Sixty Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 437.2 452.0
Tier 1 | Sixty One To Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 276.9 221.7
Tier 1 | Greater Than Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 59.8 57.1
Tier 1 | Credit Grade A    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Current 9,522.5 9,543.3
Financing Receivable, before Allowance for Credit Loss, Noncurrent 60.0 57.4
Financing Receivable, before Allowance for Credit Loss 9,582.5 9,600.7
Tier 1 | Credit Grade A | Thirty One To Sixty Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 36.7 36.7
Tier 1 | Credit Grade A | Sixty One To Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 17.8 14.8
Tier 1 | Credit Grade A | Greater Than Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 5.5 5.9
Tier 1 | Credit Grade B    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Current 4,679.7 5,491.5
Financing Receivable, before Allowance for Credit Loss, Noncurrent 468.1 437.6
Financing Receivable, before Allowance for Credit Loss 5,147.8 5,929.1
Tier 1 | Credit Grade B | Thirty One To Sixty Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 271.6 276.0
Tier 1 | Credit Grade B | Sixty One To Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 160.8 127.3
Tier 1 | Credit Grade B | Greater Than Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 35.7 34.3
Tier 1 | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Current 989.8 1,164.7
Financing Receivable, before Allowance for Credit Loss, Noncurrent 245.8 235.8
Financing Receivable, before Allowance for Credit Loss 1,235.6 1,400.5
Tier 1 | Credit Grade C And Other | Thirty One To Sixty Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 128.9 139.3
Tier 1 | Credit Grade C And Other | Sixty One To Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 98.3 79.6
Tier 1 | Credit Grade C And Other | Greater Than Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 18.6 16.9
Tier 2 & Tier 3 | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Current 443.5 541.2
Financing Receivable, before Allowance for Credit Loss, Noncurrent 124.4 123.1
Financing Receivable, before Allowance for Credit Loss 567.9 664.3
Tier 2 & Tier 3 | Credit Grade C And Other | Thirty One To Sixty Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 63.2 71.9
Tier 2 & Tier 3 | Credit Grade C And Other | Sixty One To Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 51.5 41.2
Tier 2 & Tier 3 | Credit Grade C And Other | Greater Than Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 9.7 $ 10.0