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Auto Loan Receivables (Past Due Receivables) (Details) - USD ($) $ in Millions | Aug. 31, 2024 | Feb. 29, 2024
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Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss, Current | $ 16,785.7 | $ 16,445.2
Past due receivables as a percentage of total ending managed receivables | 5.53% | 5.44%
Financing Receivable, before Allowance for Credit Loss, Noncurrent | $ 983.7 | $ 946.6
Financing Receivable, before Allowance for Credit Loss | $ 17,769.4 | $ 17,391.8
Item As A Percent Of Total Ending Managed Receivables | 100.00% | 100.00%
One to Thirty Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past due receivables as a percentage of total ending managed receivables | 94.47% | 94.56%
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 | 3.04% | 3.07%
Financing Receivable, before Allowance for Credit Loss, Noncurrent | $ 541.2 | $ 534.4
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 | 2.07% | 1.93%
Financing Receivable, before Allowance for Credit Loss, Noncurrent | $ 367.3 | $ 336.0
Greater Than Ninety Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past due receivables as a percentage of total ending managed receivables | 0.42% | 0.44%
Financing Receivable, before Allowance for Credit Loss, Noncurrent | $ 75.2 | $ 76.2
Core managed receivables |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss, Current | 16,320.6 | 15,998.1
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 846.2 | 815.2
Financing Receivable, before Allowance for Credit Loss | 17,166.8 | 16,813.3
Core managed receivables | Thirty One To Sixty Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 472.6 | 466.3
Core managed receivables | Sixty One To Ninety Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 309.0 | 283.0
Core managed receivables | Greater Than Ninety Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 64.6 | 65.9
Core managed receivables | Credit Grade A |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss, Current | 9,506.6 | 9,088.1
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 54.8 | 53.0
Financing Receivable, before Allowance for Credit Loss | 9,561.4 | 9,141.1
Core managed receivables | 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 | 33.1 | 32.1
Core managed receivables | 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 | 16.6 | 15.1
Core managed receivables | Credit Grade A | Greater Than Ninety Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 5.1 | 5.8
Core managed receivables | Credit Grade B |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss, Current | 5,609.7 | 5,666.3
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 486.9 | 457.2
Financing Receivable, before Allowance for Credit Loss | 6,096.6 | 6,123.5
Core managed receivables | 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 | 279.3 | 271.3
Core managed receivables | 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 | 170.4 | 149.4
Core managed receivables | Credit Grade B | Greater Than Ninety Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 37.2 | 36.5
Core managed receivables | Credit Grade C And Other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss, Current | 1,204.3 | 1,243.7
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 304.5 | 305.0
Financing Receivable, before Allowance for Credit Loss | 1,508.8 | 1,548.7
Core managed receivables | 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 | 160.2 | 162.9
Core managed receivables | 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 | 122.0 | 118.5
Core managed receivables | 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 | 22.3 | 23.6
Other managed receivables | Credit Grade C And Other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss, Current | 465.1 | 447.1
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 137.5 | 131.4
Financing Receivable, before Allowance for Credit Loss | 602.6 | 578.5
Other managed receivables | 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 | 68.6 | 68.1
Other managed receivables | 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 | 58.3 | 53.0
Other managed receivables | 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 | $ 10.6 | $ 10.3

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