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Summary of Significant Accounting Policies (Narrative) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
portfolio_segment
segment
Dec. 31, 2018
USD ($)
Summary Of Significant Accounting Policies [Line Items]    
Number of reportable segments | segment 1  
Uninsured cash and cash equivalents $ 40.5 $ 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 $ 3.7  
Lease liability 3.8  
Restricted Cash and Cash Equivalents [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Uninsured cash and cash equivalents $ 414.4 $ 303.0