v3.26.1
Auto Loans Held for Investment (Past Due Receivables) (Details) - USD ($)
$ in Millions
May 31, 2026
Feb. 28, 2026
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Current $ 15,261.0 $ 15,441.1
Past due receivables as a percentage of total auto loans held for investment 5.20% 5.11%
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 837.5 $ 830.8
Financing Receivable, before Allowance for Credit Loss $ 16,098.5 $ 16,271.9
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 94.80% 94.89%
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 3.00% 2.96%
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 483.2 $ 481.8
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 1.79% 1.74%
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 287.7 $ 282.7
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% 0.41%
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 66.6 $ 66.3
Tier 1    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Current 14,678.9 15,005.4
Financing Receivable, before Allowance for Credit Loss, Noncurrent 712.0 716.1
Financing Receivable, before Allowance for Credit Loss 15,390.9 15,721.5
Tier 1 | Thirty One To Sixty Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 414.1 419.3
Tier 1 | Sixty One To Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 241.0 238.8
Tier 1 | Greater Than Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 56.9 58.0
Tier 1 | Credit Grade A    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Current 9,510.1 9,414.1
Financing Receivable, before Allowance for Credit Loss, Noncurrent 56.9 59.8
Financing Receivable, before Allowance for Credit Loss 9,567.0 9,473.9
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 36.5 38.3
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 15.1 15.5
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 5.3 6.0
Tier 1 | Credit Grade B    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Current 4,322.3 4,614.4
Financing Receivable, before Allowance for Credit Loss, Noncurrent 438.7 442.4
Financing Receivable, before Allowance for Credit Loss 4,761.0 5,056.8
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 258.0 264.8
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 145.9 142.1
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 34.8 35.5
Tier 1 | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Current 846.5 976.9
Financing Receivable, before Allowance for Credit Loss, Noncurrent 216.4 213.9
Financing Receivable, before Allowance for Credit Loss 1,062.9 1,190.8
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 119.6 116.2
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 80.0 81.2
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 16.8 16.5
Tier 2 & Tier 3 | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Current 582.1 435.7
Financing Receivable, before Allowance for Credit Loss, Noncurrent 125.5 114.7
Financing Receivable, before Allowance for Credit Loss 707.6 550.4
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 69.1 62.5
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 46.7 43.9
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 $ 8.3