Summary of Significant Accounting Policies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014 portfolio_segment segment	Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items]
Number of reportable segments	1
Uninsured cash and cash equivalents	$ 6.2	$ 3.6
Number of portfolio segments	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
Restricted Cash and Cash Equivalents [Member]
Summary Of Significant Accounting Policies [Line Items]
Uninsured cash and cash equivalents	$ 154.6	$ 109.5