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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