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Sales of Advances and MSRs - Narrative (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Agreement
Dec. 31, 2015
USD ($)
Servicing Assets at Fair Value [Line Items]        
Number of non-agency servicing agreements terminated due to downgrades in mortgage servicer rating | Agreement     4  
NRZ [Member]        
Servicing Assets at Fair Value [Line Items]        
UPB of MSRs sold $ 146,000.0 $ 123,200.0 $ 146,000.0 $ 137,100.0
Outstanding servicing advances   $ 4,300.0    
Period from sale of tranche of rights to mortgage servicing rights that apportionment of fees is subject to re-negotiation   8 years    
Liquidating damages paid     2.2  
Compensatory fee payable $ 8.2 $ 10.5 $ 8.5