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Sales of Advances and MSRs - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jul. 23, 2017
Jun. 30, 2017
Jun. 30, 2016
Servicing Assets at Fair Value [Line Items]      
UPB of MSRs sold   $ 134.7 $ 214.4
NRZ [Member]      
Servicing Assets at Fair Value [Line Items]      
UPB of rights to MSRs sold   109,600.0  
Outstanding servicing advances   $ 3,400.0  
Subsequent Event [Member] | NRZ [Member]      
Servicing Assets at Fair Value [Line Items]      
Initial term to subservice mortgage servicing rights 5 years    
Term of extended subservicing agreement following initial term 3 months