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Organization, Business Environment and Basis of Presentation - Narrative (Details) - USD ($)
$ in Millions
May 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
UPB of MSRs sold   $ 128,100.0  
Periodic prepayment of SSTL $ 6.3    
Unamortized debt issuance costs   $ 20.3 $ 24.5