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Mortgage Servicing - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Loan
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Servicing Asset at Amortized Cost [Line Items]      
UPB of rights to MSRs sold $ 137,100.0 $ 160,800.0 $ 175,100.0
UPB of small-balance commercial assets $ 1,800.0 2,300.0 2,600.0
Number of non-agency and whole loans servicing agreements | Loan 3,979    
Number of non-agency and whole loans servicing agreements with minimum servicer ratings | Loan 745    
Unpaid principal balance of non-agency and whole loans servicing agreements with minimum servicer ratings $ 40,100.0    
Number of non-agency and whole loans servicing agreements with termination rights triggered | Loan 664    
Unpaid principal balance of non-agency and whole loans servicing agreements with termination rights triggered $ 34,300.0    
Percentage of non-agency and whole loans servicing agreements with termination rights triggered of servicing portfolio 18.30%    
Percentage of servicing transferred due to downgrades in mortgage servicer rating 0.17%    
Float balances $ 2,200.0 3,400.0 $ 3,200.0
NRZ [Member]      
Servicing Asset at Amortized Cost [Line Items]      
Reimbursements on account of loss of servicing revenues $ 2.2 2.0  
Secured Debt [Member] | OASIS Series 2014-1 [Member]      
Servicing Asset at Amortized Cost [Line Items]      
Face amount   123.6  
Mortgage Servicing Rights [Member]      
Servicing Asset at Amortized Cost [Line Items]      
Unpaid principal balance   $ 11,800.0