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Sales of Advances and MSRs Schedule of MSRs and Advances Sold (Footnote) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Transfers and Servicing [Abstract]    
UPB of MSRs sold $ 3,600.0 $ 86,400.0
Amounts due on sales of MSRs and advances $ 31.6