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Loans Receivable Loans Receivable (Summary of Provision for Credit Losses) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Provision for Credit Losses $ 161.9 $ 186.0
Dealer Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Provision for Credit Losses 104.7 121.7
Purchased Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Provision for Credit Losses 57.2 64.3
New Consumer Loan Assignments [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Provision for Credit Losses 85.6 98.8
New Consumer Loan Assignments [Member] | Dealer Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Provision for Credit Losses 52.1 57.4
New Consumer Loan Assignments [Member] | Purchased Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Provision for Credit Losses 33.5 41.4
Forecast Changes [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Provision for Credit Losses 76.3 87.2
Forecast Changes [Member] | Dealer Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Provision for Credit Losses 52.6 64.3
Forecast Changes [Member] | Purchased Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Provision for Credit Losses $ 23.7 $ 22.9