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Organization, Business Environment and Basis of Presentation - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
UPB of MSRs sold $ 132,700.0  
Periodic prepayment of SSTL 6.3  
Unamortized debt issuance costs $ 23.5 $ 24.5