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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