Commitments And Contingencies Commitments and Contingencies (Details) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
Consumer Loan [Member]
Other Commitments [Line Items]
Purchase Commitment, Remaining Minimum Amount Committed	$ 11.1
Purchase commitment	100.0
Purchases made in connection with purchase commitments	89.1
Purchase commitment principal balance	375.0
Purchases made in connection with purchase commitments principal balance	5.1
Non-Exchange Traded Equity Investment in Mortgage Originator
Other Commitments [Line Items]
Guaranty Liabilities	12.5
Flow agreement March 2015 with mortgage originator [Member]
Other Commitments [Line Items]
Purchase commitment	200.0
Purchases made in connection with purchase commitments	40.6
Performance Guarantee [Member]
Other Commitments [Line Items]
Participation Interest in Repo Facility	10.0
Amount of Utilization	$ 196.6
Additional amount to be posted	5.00%
Financing Duration	6 months
Maximum Borrowings under Repo Facility	$ 200.0