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Loans Receivable (Write-Offs Segmented by Year of Assignment) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff | $ 53.8 |  | $ 178.8 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff | 69.4 |  | 219.2 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff | 52.7 |  | 158.9 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff | 59.0 |  | 166.6 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff | 70.2 |  | 196.9 |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff | 28.8 |  | 43.5 |
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 | 333.9 | 348.8 | 963.9 | 1,017.6
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 | 29.5 |  | 95.1 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff | 26.2 |  | 76.9 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff | 28.9 |  | 80.2 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff | 30.3 |  | 75.7 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff | 31.7 |  | 78.0 |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff | 7.1 |  | 11.3 |
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 | 153.7 | 116.1 | 417.2 | 315.8
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 | 24.3 |  | 83.7 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff | 43.2 |  | 142.3 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff | 23.8 |  | 78.7 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff | 28.7 |  | 90.9 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff | 38.5 |  | 118.9 |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff | 21.7 |  | 32.2 |
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 | $ 180.2 | $ 232.7 | $ 546.7 | $ 701.8

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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(3) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B + Details
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- Definition Amount of writeoff of financing receivable originated more than five years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
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