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Loans Receivable Loans Receivable (Summary of Provision for Credit Losses) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision for Credit Losses $ 152.0 $ 184.7 $ 486.5 $ 691.3
Dealer Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision for Credit Losses 87.6 123.5 294.3 457.5
Purchased Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision for Credit Losses 64.4 61.2 192.2 233.8
New Consumer Loan Assignments [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision for Credit Losses 63.9 78.8 220.8 260.4
New Consumer Loan Assignments [Member] | Dealer Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision for Credit Losses 34.9 49.4 123.8 155.4
New Consumer Loan Assignments [Member] | Purchased Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision for Credit Losses 29.0 29.4 97.0 105.0
Forecast Changes [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision for Credit Losses 88.1 105.9 265.7 430.9
Forecast Changes [Member] | Dealer Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision for Credit Losses 52.7 74.1 170.5 302.1
Forecast Changes [Member] | Purchased Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision for Credit Losses $ 35.4 $ 31.8 $ 95.2 $ 128.8