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Loans Receivable (Write-Offs Segmented by Year of Assignment) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 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 | $ 82.2 | $ 61.9 | $ 168.9 | $ 125.0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff | 48.0 | 77.9 | 95.1 | 149.9
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff | 57.9 | 53.7 | 114.7 | 106.2
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff | 82.0 | 55.8 | 155.3 | 107.6
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff | 50.8 | 67.4 | 95.7 | 126.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff | 8.1 | 12.7 | 10.7 | 14.6
Allowance for Loan and Lease Losses, Write-offs | 0.0 | 0.0 | 0.0 | 0.0
Allowance for Credit Losses [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |
Allowance for Loan and Lease Losses, Write-offs | 329.0 | 329.4 | 640.4 | 630.0
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 | 46.4 | 33.9 | 91.6 | 65.5
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff | 28.8 | 27.1 | 54.1 | 50.8
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff | 35.0 | 27.6 | 63.9 | 51.3
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff | 45.9 | 26.6 | 79.1 | 45.4
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff | 13.2 | 27.3 | 22.2 | 46.3
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff | 1.9 | 3.3 | 3.1 | 4.2
Allowance for Loan and Lease Losses, Write-offs | 0.0 | 0.0 | 0.0 | 0.0
Dealer Loans [Member] | Allowance for Credit Losses [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |
Allowance for Loan and Lease Losses, Write-offs | 171.2 | 145.8 | 314.0 | 263.5
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 | 35.8 | 28.0 | 77.3 | 59.5
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff | 19.2 | 50.8 | 41.0 | 99.1
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff | 22.9 | 26.1 | 50.8 | 54.9
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff | 36.1 | 29.2 | 76.2 | 62.2
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff | 37.6 | 40.1 | 73.5 | 80.4
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff | 6.2 | 9.4 | 7.6 | 10.4
Allowance for Loan and Lease Losses, Write-offs | 0.0 | 0.0 | 0.0 | 0.0
Purchased Loans [Member] | Allowance for Credit Losses [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |
Allowance for Loan and Lease Losses, Write-offs | $ 157.8 | $ 183.6 | $ 326.4 | $ 366.5

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