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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision for Credit Losses $ 184.7 $ 184.6 $ 691.3 $ 572.5
Dealer Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision for Credit Losses 123.5 108.0 457.5 327.3
Purchased Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision for Credit Losses 61.2 76.6 233.8 245.2
New Consumer Loan Assignments [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision for Credit Losses 78.8 78.3 260.4 253.1
New Consumer Loan Assignments [Member] | Dealer Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision for Credit Losses 49.4 37.4 155.4 108.9
New Consumer Loan Assignments [Member] | Purchased Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision for Credit Losses 29.4 40.9 105.0 144.2
Forecast Changes [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision for Credit Losses 105.9 106.3 430.9 319.4
Forecast Changes [Member] | Dealer Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision for Credit Losses 74.1 70.6 302.1 218.4
Forecast Changes [Member] | Purchased Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision for Credit Losses $ 31.8 $ 35.7 $ 128.8 $ 101.0