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Auto Loans Held for Investment (By Major Credit Grade) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Nov. 30, 2025
Nov. 30, 2024
Nov. 30, 2025
Nov. 30, 2024
Feb. 28, 2025
Financing Receivable, By Major Credit Grade [Line Items]          
Financing Receivable, Originated in Current Fiscal Year $ 4,914.3   $ 4,914.3   $ 6,907.1
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 4,843.5   4,843.5   4,726.0
Financing Receivable, Originated Two Years before Latest Fiscal Year 3,330.5   3,330.5   3,278.3
Financing Receivable, Originated Three Years before Latest Fiscal Year 2,141.8   2,141.8   1,929.3
Financing Receivable, Originated Four Years before Latest Fiscal Year 1,068.5   1,068.5   593.6
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 235.2   235.2   160.3
Financing Receivable, before Allowance for Credit Loss $ 16,533.8   $ 16,533.8   $ 17,594.6
Total ending managed receivables as percentage by major credit grade 100.00%   100.00%   100.00%
Financing Receivable, Allowance for Credit Loss, Writeoff $ 169.8 $ 150.2 $ 480.2 $ 447.1 $ 589.2
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff     141.9   196.2
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff     116.8   193.2
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff     120.3   107.2
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff     61.3   30.3
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff     20.9   17.6
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff     19.0   44.7
Tier 1          
Financing Receivable, By Major Credit Grade [Line Items]          
Financing Receivable, Originated in Current Fiscal Year 4,760.8   4,760.8   6,595.2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 4,653.3   4,653.3   4,548.9
Financing Receivable, Originated Two Years before Latest Fiscal Year 3,208.9   3,208.9   3,161.4
Financing Receivable, Originated Three Years before Latest Fiscal Year 2,070.4   2,070.4   1,883.0
Financing Receivable, Originated Four Years before Latest Fiscal Year 1,041.8   1,041.8   588.2
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 230.7   230.7   153.6
Financing Receivable, before Allowance for Credit Loss $ 15,965.9   $ 15,965.9   $ 16,930.3
Total ending managed receivables as percentage by major credit grade 96.60%   96.60%   96.20%
Financing Receivable, Allowance for Credit Loss, Writeoff $ 145.5 129.0 $ 407.0 373.1  
Tier 2 & Tier 3          
Financing Receivable, By Major Credit Grade [Line Items]          
Financing Receivable, Allowance for Credit Loss, Writeoff 24.3 $ 21.2 73.2 $ 74.0  
Credit Grade A | Tier 1          
Financing Receivable, By Major Credit Grade [Line Items]          
Financing Receivable, Originated in Current Fiscal Year 3,138.1   3,138.1   $ 4,132.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 3,035.6   3,035.6   2,607.9
Financing Receivable, Originated Two Years before Latest Fiscal Year 1,805.9   1,805.9   1,673.9
Financing Receivable, Originated Three Years before Latest Fiscal Year 1,059.6   1,059.6   894.1
Financing Receivable, Originated Four Years before Latest Fiscal Year 465.3   465.3   243.9
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 78.0   78.0   48.9
Financing Receivable, before Allowance for Credit Loss $ 9,582.5   $ 9,582.5   $ 9,600.7
Total ending managed receivables as percentage by major credit grade 58.00%   58.00%   54.50%
Credit Grade B | Tier 1          
Financing Receivable, By Major Credit Grade [Line Items]          
Financing Receivable, Originated in Current Fiscal Year $ 1,269.8   $ 1,269.8   $ 2,041.1
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 1,350.8   1,350.8   1,664.0
Financing Receivable, Originated Two Years before Latest Fiscal Year 1,201.7   1,201.7   1,163.0
Financing Receivable, Originated Three Years before Latest Fiscal Year 792.8   792.8   746.4
Financing Receivable, Originated Four Years before Latest Fiscal Year 433.8   433.8   244.9
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 98.9   98.9   69.7
Financing Receivable, before Allowance for Credit Loss $ 5,147.8   $ 5,147.8   $ 5,929.1
Total ending managed receivables as percentage by major credit grade 31.10%   31.10%   33.70%
Credit Grade C And Other | Tier 1          
Financing Receivable, By Major Credit Grade [Line Items]          
Financing Receivable, Originated in Current Fiscal Year $ 352.9   $ 352.9   $ 422.1
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 266.9   266.9   277.0
Financing Receivable, Originated Two Years before Latest Fiscal Year 201.3   201.3   324.5
Financing Receivable, Originated Three Years before Latest Fiscal Year 218.0   218.0   242.5
Financing Receivable, Originated Four Years before Latest Fiscal Year 142.7   142.7   99.4
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 53.8   53.8   35.0
Financing Receivable, before Allowance for Credit Loss $ 1,235.6   $ 1,235.6   $ 1,400.5
Total ending managed receivables as percentage by major credit grade 7.50%   7.50%   8.00%
Credit Grade C And Other | Tier 2 & Tier 3          
Financing Receivable, By Major Credit Grade [Line Items]          
Financing Receivable, Originated in Current Fiscal Year $ 153.5   $ 153.5   $ 311.9
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 190.2   190.2   177.1
Financing Receivable, Originated Two Years before Latest Fiscal Year 121.6   121.6   116.9
Financing Receivable, Originated Three Years before Latest Fiscal Year 71.4   71.4   46.3
Financing Receivable, Originated Four Years before Latest Fiscal Year 26.7   26.7   5.4
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 4.5   4.5   6.7
Financing Receivable, before Allowance for Credit Loss $ 567.9   $ 567.9   $ 664.3
Total ending managed receivables as percentage by major credit grade 3.40%   3.40%   3.80%