v3.24.1.u1
Auto Loan Receivables (Past Due Receivables) (Details) - USD ($)
$ in Millions
Feb. 29, 2024
Feb. 28, 2023
Financing Receivable, Past Due [Line Items]    
Total ending managed receivables $ 17,391.8 $ 16,767.9
Past due receivables as a percentage of total ending managed receivables 5.44% 5.00%
Financing Receivable, before Allowance for Credit Loss, Current $ 16,445.2 $ 15,930.4
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 946.6 $ 837.5
Managed Receivables    
Financing Receivable, Past Due [Line Items]    
Item as percent of total ending managed receivables 100.00% 100.00%
Core managed receivables    
Financing Receivable, Past Due [Line Items]    
Total ending managed receivables $ 16,813.3 $ 16,329.2
Financing Receivable, before Allowance for Credit Loss, Current 15,998.1 15,602.8
Financing Receivable, before Allowance for Credit Loss, Noncurrent 815.2 726.4
Core managed receivables | Credit Grade A [Member]    
Financing Receivable, Past Due [Line Items]    
Total ending managed receivables 9,141.1 8,489.9
Financing Receivable, before Allowance for Credit Loss, Current 9,088.1 8,450.3
Financing Receivable, before Allowance for Credit Loss, Noncurrent 53.0 39.6
Core managed receivables | Credit Grade B    
Financing Receivable, Past Due [Line Items]    
Total ending managed receivables 6,123.5 5,913.6
Financing Receivable, before Allowance for Credit Loss, Current 5,666.3 5,540.2
Financing Receivable, before Allowance for Credit Loss, Noncurrent 457.2 373.4
Core managed receivables | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Total ending managed receivables 1,548.7 1,925.7
Financing Receivable, before Allowance for Credit Loss, Current 1,243.7 1,612.3
Financing Receivable, before Allowance for Credit Loss, Noncurrent 305.0 313.4
Other managed receivables | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Total ending managed receivables 578.5 438.7
Financing Receivable, before Allowance for Credit Loss, Current 447.1 327.6
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 131.4 $ 111.1
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% 2.90%
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 534.4 $ 486.8
Thirty One To Sixty Days Past Due [Member] | Core managed receivables    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 466.3 426.2
Thirty One To Sixty Days Past Due [Member] | Core managed receivables | Credit Grade A [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 32.1 25.1
Thirty One To Sixty Days Past Due [Member] | Core managed receivables | Credit Grade B    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 271.3 225.7
Thirty One To Sixty Days Past Due [Member] | Core managed receivables | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 162.9 175.4
Thirty One To Sixty Days Past Due [Member] | Other managed receivables | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 68.1 $ 60.6
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 1.93% 1.71%
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 336.0 $ 287.2
Sixty One To Ninety Days Past Due [Member] | Core managed receivables    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 283.0 245.1
Sixty One To Ninety Days Past Due [Member] | Core managed receivables | Credit Grade A [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 15.1 10.6
Sixty One To Ninety Days Past Due [Member] | Core managed receivables | Credit Grade B    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 149.4 120.0
Sixty One To Ninety Days Past Due [Member] | Core managed receivables | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 118.5 114.5
Sixty One To Ninety Days Past Due [Member] | Other managed receivables | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 53.0 $ 42.1
Greater Than Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Past due receivables as a percentage of total ending managed receivables 0.44% 0.39%
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 76.2 $ 63.5
Greater Than Ninety Days Past Due [Member] | Core managed receivables    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 65.9 55.1
Greater Than Ninety Days Past Due [Member] | Core managed receivables | Credit Grade A [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 5.8 3.9
Greater Than Ninety Days Past Due [Member] | Core managed receivables | Credit Grade B    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 36.5 27.7
Greater Than Ninety Days Past Due [Member] | Core managed receivables | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 23.6 23.5
Greater Than Ninety Days Past Due [Member] | Other managed receivables | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 10.3 $ 8.4
Financial Asset, 1 to 29 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due receivables as a percentage of total ending managed receivables 94.56% 95.00%