Auto Loan Receivables (Past Due Receivables) (Details) - USD ($) $ in Millions | Nov. 30, 2024 | Feb. 29, 2024 |
Financing Receivable, Past Due [Line Items] | | |
Financing Receivable, before Allowance for Credit Loss, Current | $ 16,886.9 | $ 16,445.2 |
Past due receivables as a percentage of total ending managed receivables | 4.90% | 5.44% |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | $ 869.5 | $ 946.6 |
Financing Receivable, before Allowance for Credit Loss | $ 17,756.4 | $ 17,391.8 |
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 | 95.10% | 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 | 3.07% | 3.07% |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | $ 544.9 | $ 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 | 1.48% | 1.93% |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | $ 263.1 | $ 336 |
Greater Than Ninety Days Past Due [Member] | | |
Financing Receivable, Past Due [Line Items] | | |
Past due receivables as a percentage of total ending managed receivables | 0.35% | 0.44% |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | $ 61.5 | $ 76.2 |
Core managed receivables | | |
Financing Receivable, Past Due [Line Items] | | |
Financing Receivable, before Allowance for Credit Loss, Current | 16,360.5 | 15,998.1 |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 756 | 815.2 |
Financing Receivable, before Allowance for Credit Loss | 17,116.5 | 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 | 475.4 | 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 | 226.8 | 283 |
Core managed receivables | Greater Than Ninety Days Past Due [Member] | | |
Financing Receivable, Past Due [Line Items] | | |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 53.8 | 65.9 |
Core managed receivables | Credit Grade A | | |
Financing Receivable, Past Due [Line Items] | | |
Financing Receivable, before Allowance for Credit Loss, Current | 9,560.3 | 9,088.1 |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 55.4 | 53 |
Financing Receivable, before Allowance for Credit Loss | 9,615.7 | 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 | 35.6 | 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 | 14.9 | 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 | 4.9 | 5.8 |
Core managed receivables | Credit Grade B | | |
Financing Receivable, Past Due [Line Items] | | |
Financing Receivable, before Allowance for Credit Loss, Current | 5,600.1 | 5,666.3 |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 445.3 | 457.2 |
Financing Receivable, before Allowance for Credit Loss | 6,045.4 | 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 | 284.4 | 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 | 129.6 | 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 | 31.3 | 36.5 |
Core managed receivables | Credit Grade C And Other | | |
Financing Receivable, Past Due [Line Items] | | |
Financing Receivable, before Allowance for Credit Loss, Current | 1,200.1 | 1,243.7 |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 255.3 | 305 |
Financing Receivable, before Allowance for Credit Loss | 1,455.4 | 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 | 155.4 | 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 | 82.3 | 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 | 17.6 | 23.6 |
Other managed receivables | Credit Grade C And Other | | |
Financing Receivable, Past Due [Line Items] | | |
Financing Receivable, before Allowance for Credit Loss, Current | 526.4 | 447.1 |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 113.5 | 131.4 |
Financing Receivable, before Allowance for Credit Loss | 639.9 | 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 | 69.5 | 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 | 36.3 | 53 |
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 | $ 7.7 | $ 10.3 |