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Auto Loan Receivables (Ending Managed Receivables By Major Credit Grade) (Details) - USD ($)
$ in Millions
 12 Months Ended
Feb. 29, 2024
Feb. 28, 2023
Financing Receivable, By Major Credit Grade [Line Items]    
Total ending managed receivables $ 17,391.8 $ 16,767.9
Total ending managed receivables as percentage by major credit grade 100.00% 100.00%
Financing Receivable, Year One, Originated, Current Fiscal Year $ 6,936.6 $ 7,393.1
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 5,074.3 5,117.2
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 3,333.9 2,257.7
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,308.8 1,356.4
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 600.8 520.7
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 137.4 122.8
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff 111.0  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff 248.6  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff 129.8  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff 41.0  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff 19.7  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff 11.4  
Financing Receivable, Allowance for Credit Loss, Writeoff 561.5 402.5
Core managed receivables    
Financing Receivable, By Major Credit Grade [Line Items]    
Total ending managed receivables $ 16,813.3 $ 16,329.2
Total ending managed receivables as percentage by major credit grade 96.70% 97.40%
Financing Receivable, Year One, Originated, Current Fiscal Year $ 6,637.6 $ 7,121.1
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 4,898.0 5,004.7
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 3,261.3 2,242.7
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,299.5 1,335.3
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 588.7 507.5
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 128.2 117.9
Financing Receivable, Allowance for Credit Loss, Writeoff 471.6 348.1
Other managed receivables    
Financing Receivable, By Major Credit Grade [Line Items]    
Financing Receivable, Allowance for Credit Loss, Writeoff 89.9 54.4
Credit Grade A [Member] | Core managed receivables    
Financing Receivable, By Major Credit Grade [Line Items]    
Total ending managed receivables $ 9,141.1 $ 8,489.9
Total ending managed receivables as percentage by major credit grade 52.60% 50.60%
Financing Receivable, Year One, Originated, Current Fiscal Year $ 3,922.7 $ 3,890.9
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 2,660.6 2,555.3
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 1,635.1 1,112.0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 614.0 677.1
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 268.7 218.3
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 40.0 36.3
Credit Grade B | Core managed receivables    
Financing Receivable, By Major Credit Grade [Line Items]    
Total ending managed receivables $ 6,123.5 $ 5,913.6
Total ending managed receivables as percentage by major credit grade 35.20% 35.30%
Financing Receivable, Year One, Originated, Current Fiscal Year $ 2,370.8 $ 2,497.5
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 1,738.8 1,839.9
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 1,225.9 816.2
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 493.3 488.9
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 233.4 215.1
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 61.3 56.0
Credit Grade C And Other | Core managed receivables    
Financing Receivable, By Major Credit Grade [Line Items]    
Total ending managed receivables $ 1,548.7 $ 1,925.7
Total ending managed receivables as percentage by major credit grade 8.90% 11.50%
Financing Receivable, Year One, Originated, Current Fiscal Year $ 344.1 $ 732.7
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 498.6 609.5
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 400.3 314.5
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 192.2 169.3
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 86.6 74.1
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 26.9 25.6
Credit Grade C And Other | Other managed receivables    
Financing Receivable, By Major Credit Grade [Line Items]    
Total ending managed receivables $ 578.5 $ 438.7
Total ending managed receivables as percentage by major credit grade 3.30% 2.60%
Financing Receivable, Year One, Originated, Current Fiscal Year $ 299.0 $ 272.0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 176.3 112.5
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 72.6 15.0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 9.3 21.1
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 12.1 13.2
Financing Receivable, Originated, More than Five Years before Current Fiscal Year $ 9.2 $ 4.9