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Loans Receivable (Write-Offs Segmented by Year of Assignment) (Details) - Allowance for Credit Losses [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff | $ 75.1 | $ 53.8 | $ 244.0 | $ 178.8
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff | 45.4 | 69.4 | 140.6 | 219.2
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff | 55.9 | 52.7 | 170.5 | 158.9
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff | 80.4 | 59.0 | 235.7 | 166.6
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff | 48.1 | 70.2 | 143.8 | 196.9
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff | 21.9 | 28.8 | 32.6 | 43.5
Allowance for Loan and Lease Losses, Write-offs | 326.8 | 333.9 | 967.2 | 963.9
Dealer Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff | 43.4 | 29.5 | 135.0 | 95.1
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff | 27.9 | 26.2 | 82.0 | 76.9
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff | 33.2 | 28.9 | 97.1 | 80.2
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff | 47.0 | 30.3 | 126.1 | 75.7
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff | 11.5 | 31.7 | 33.7 | 78.0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff | 4.0 | 7.1 | 7.1 | 11.3
Allowance for Loan and Lease Losses, Write-offs | 167.0 | 153.7 | 481.0 | 417.2
Purchased Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff | 31.7 | 24.3 | 109.0 | 83.7
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff | 17.5 | 43.2 | 58.6 | 142.3
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff | 22.7 | 23.8 | 73.4 | 78.7
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff | 33.4 | 28.7 | 109.6 | 90.9
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff | 36.6 | 38.5 | 110.1 | 118.9
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff | 17.9 | 21.7 | 25.5 | 32.2
Allowance for Loan and Lease Losses, Write-offs | $ 159.8 | $ 180.2 | $ 486.2 | $ 546.7

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