Auto Loan Receivables (Past Due Receivables) (Details) - USD ($) $ in Millions | Nov. 30, 2023 | Feb. 28, 2023 |
Financing Receivable, Past Due [Line Items] | | |
Financing Receivable, before Allowance for Credit Loss, Current | $ 16,487.7 | $ 15,930.4 |
Past due receivables as a percentage of total ending managed receivables | 5.81% | 5% |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | $ 1,017.4 | $ 837.5 |
Financing Receivable, before Allowance for Credit Loss | $ 17,505.1 | $ 16,767.9 |
Item As A Percent Of Total Ending Managed Receivables | 100% | 100% |
One to Thirty Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Past due receivables as a percentage of total ending managed receivables | 94.19% | 95% |
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 | 3.13% | 2.90% |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | $ 548.4 | $ 486.8 |
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 | 2.21% | 1.71% |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | $ 387 | $ 287.2 |
Greater Than Ninety Days Past Due [Member] | | |
Financing Receivable, Past Due [Line Items] | | |
Past due receivables as a percentage of total ending managed receivables | 0.47% | 0.39% |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | $ 82 | $ 63.5 |
Core managed receivables | | |
Financing Receivable, Past Due [Line Items] | | |
Financing Receivable, before Allowance for Credit Loss, Current | 16,089.4 | 15,602.8 |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 874.8 | 726.4 |
Financing Receivable, before Allowance for Credit Loss | 16,964.2 | 16,329.2 |
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 | 480.3 | 426.2 |
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 | 324.7 | 245.1 |
Core managed receivables | Greater Than Ninety Days Past Due [Member] | | |
Financing Receivable, Past Due [Line Items] | | |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 69.8 | 55.1 |
Core managed receivables | Credit Grade A | | |
Financing Receivable, Past Due [Line Items] | | |
Financing Receivable, before Allowance for Credit Loss, Current | 9,079.3 | 8,450.3 |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 52.3 | 39.6 |
Financing Receivable, before Allowance for Credit Loss | 9,131.6 | 8,489.9 |
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 | 31.6 | 25.1 |
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 | 15.5 | 10.6 |
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 | 5.2 | 3.9 |
Core managed receivables | Credit Grade B | | |
Financing Receivable, Past Due [Line Items] | | |
Financing Receivable, before Allowance for Credit Loss, Current | 5,715.6 | 5,540.2 |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 472.7 | 373.4 |
Financing Receivable, before Allowance for Credit Loss | 6,188.3 | 5,913.6 |
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 | 270.6 | 225.7 |
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 | 165 | 120 |
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 | 37.1 | 27.7 |
Core managed receivables | Credit Grade C And Other | | |
Financing Receivable, Past Due [Line Items] | | |
Financing Receivable, before Allowance for Credit Loss, Current | 1,294.5 | 1,612.3 |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 349.8 | 313.4 |
Financing Receivable, before Allowance for Credit Loss | 1,644.3 | 1,925.7 |
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 | 178.1 | 175.4 |
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 | 144.2 | 114.5 |
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 | 27.5 | 23.5 |
Other managed receivables | Credit Grade C And Other | | |
Financing Receivable, Past Due [Line Items] | | |
Financing Receivable, before Allowance for Credit Loss, Current | 398.3 | 327.6 |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 142.6 | 111.1 |
Financing Receivable, before Allowance for Credit Loss | 540.9 | 438.7 |
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 | 68.1 | 60.6 |
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 | 62.3 | 42.1 |
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 | $ 12.2 | $ 8.4 |