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Summary of Significant Accounting Policies (Narrative) (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2019
USD ($)
segment
portfolio_segment
Dec. 31, 2018
USD ($)
Summary Of Significant Accounting Policies [Line Items]    
Document Period End Date Sep. 30, 2019  
Number of reportable segments | segment 1  
Uninsured cash and cash equivalents $ 24.0 $ 25.1
Number of portfolio segments | portfolio_segment 2  
Period after Consumer Loan assignment that Dealer Loans written off 120 months  
Period after month of purchase that Purchased Loans written off 120 months  
Right-of-use asset $ 3.0  
Lease liability 3.2  
Restricted Cash and Cash Equivalents [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Uninsured cash and cash equivalents $ 326.5 $ 303.0