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Auto Loan Receivables (Past Due Receivables) (Details) - USD ($) $ in Millions | Nov. 30, 2021 | Feb. 28, 2021
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Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss, Current | $ 14,929.6 | $ 13,454.7
Total ending managed receivables | $ 15,524.0 | $ 13,847.2
Past due receivables as a percentage of total ending managed receivables | 3.83% | 2.83%
Financing Receivable, before Allowance for Credit Loss, Noncurrent | $ 594.4 | $ 392.5
Total ending managed receivables, percent |  |
Financing Receivable, Past Due [Line Items] |  |
Item as percent of total ending managed receivables | 100.00% | 100.00%
Financial Asset, Current |  |
Financing Receivable, Past Due [Line Items] |  |
Past due receivables as a percentage of total ending managed receivables | 96.17% | 97.17%
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 | 2.34% | 1.78%
Financing Receivable, before Allowance for Credit Loss, Noncurrent | $ 363.1 | $ 246.2
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 | 1.20% | 0.86%
Financing Receivable, before Allowance for Credit Loss, Noncurrent | $ 186.0 | $ 119.9
Greater Than Ninety Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past due receivables as a percentage of total ending managed receivables | 0.29% | 0.19%
Financing Receivable, before Allowance for Credit Loss, Noncurrent | $ 45.3 | $ 26.4
Credit Grade A |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss, Current | 7,617.6 | 6,847.2
Total ending managed receivables | 7,652.6 | 6,874.1
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 35.0 | 26.9
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 | 23.0 | 17.3
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 | 9.2 | 7.0
Credit Grade A | Greater Than Ninety Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 2.8 | 2.6
Credit Grade B |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss, Current | 5,373.2 | 4,840.3
Total ending managed receivables | 5,626.4 | 5,008.9
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 253.2 | 168.6
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 | 160.4 | 108.9
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 | 74.5 | 48.4
Credit Grade B | Greater Than Ninety Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 18.3 | 11.3
Credit Grade C And Other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss, Current | 1,938.8 | 1,767.2
Total ending managed receivables | 2,245.0 | 1,964.2
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 306.2 | 197.0
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 | 179.7 | 120.0
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 | 102.3 | 64.5
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 | $ 24.2 | $ 12.5

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