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Contingencies And Commitments Contingencies and Commitments (Details)
$ in Millions
9 Months Ended
Sep. 30, 2015
USD ($)
Consumer Loan [Member]  
Other Commitments [Line Items]  
Purchase Commitment, Remaining Minimum Amount Committed $ 17.9
Purchase commitment 100.0
Purchases made in connection with purchase commitments $ 20.9
Debt and equity investments in mortgage originators [Member]  
Other Commitments [Line Items]  
Number of Investments 3
Mortgage Originator [Member]  
Other Commitments [Line Items]  
Commitments - Debt or Equity Investment $ 2.0
Mortgage Originator [Member] | Due on or before June 12, 2016 [Member]  
Other Commitments [Line Items]  
Commitments - Debt or Equity Investment 2.0
Non-Exchange Traded Equity Investment in Mortgage Originator  
Other Commitments [Line Items]  
Purchase commitment 200.0
Guaranty Liabilities 5.0
Mortgage Loans [Member]  
Other Commitments [Line Items]  
Purchases made in connection with purchase commitments 3.8
Mortgage Loan Purchase Commitments [Member] | Flow agreement June 2015 with mortgage originator [Member]  
Other Commitments [Line Items]  
Derivative Asset, Notional Amount 1.2
Mortgage Loan Purchase Commitments [Member] | Flow agreement March 2015 with mortgage originator [Member]  
Other Commitments [Line Items]  
Derivative Asset, Notional Amount 3.5
Performance Guarantee [Member]  
Other Commitments [Line Items]  
Participation Interest in Repo Facility 10.0
Amount of Utilization $ 131.4
Additional amount to be posted 5.00%
Financing Duration 6 months
Maximum Borrowings under Repo Facility $ 200.0
Percentage of Repo Facility Allowed to Comprise of High Quality Jumbo Loans 7.50%