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Loans Receivable Loans Receivable (Summary of Provision for Credit Losses) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for Credit Losses | $ 159.2 | $ 172.6 | $ 298.8 | $ 334.5
Dealer Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for Credit Losses | 79.7 | 102.0 | 151.4 | 206.7
Purchased Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for Credit Losses | 79.5 | 70.6 | 147.4 | 127.8
New Consumer Loan Assignments [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for Credit Losses | 77.6 | 71.3 | 162.8 | 156.9
New Consumer Loan Assignments [Member] | Dealer Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for Credit Losses | 33.4 | 36.8 | 76.8 | 88.9
New Consumer Loan Assignments [Member] | Purchased Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for Credit Losses | 44.2 | 34.5 | 86.0 | 68.0
Forecast Changes [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for Credit Losses | 81.6 | 101.3 | 136.0 | 177.6
Forecast Changes [Member] | Dealer Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for Credit Losses | 46.3 | 65.2 | 74.6 | 117.8
Forecast Changes [Member] | Purchased Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for Credit Losses | $ 35.3 | $ 36.1 | $ 61.4 | $ 59.8

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