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Auto Loans Held for Investment (Past Due Receivables) (Details) - USD ($) $ in Millions | Nov. 30, 2025 | Feb. 28, 2025
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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

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