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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for credit losses | $ 320.6 | $ 250.5 | $ 506.6 | $ 387.9
Dealer Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for credit losses | 212.3 | 144.6 | 334.0 | 219.3
Purchased Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for credit losses | 108.3 | 105.9 | 172.6 | 168.6
New Consumer Loan Assignments [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for credit losses | 82.8 | 81.7 | 181.6 | 174.8
New Consumer Loan Assignments [Member] | Dealer Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for credit losses | 48.6 | 33.8 | 106.0 | 71.5
New Consumer Loan Assignments [Member] | Purchased Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for credit losses | 34.2 | 47.9 | 75.6 | 103.3
Forecast Changes [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for credit losses | 237.8 | 168.8 | 325.0 | 213.1
Forecast Changes [Member] | Dealer Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for credit losses | 163.7 | 110.8 | 228.0 | 147.8
Forecast Changes [Member] | Purchased Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for credit losses | $ 74.1 | $ 58.0 | $ 97.0 | $ 65.3

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