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Commitments - Narrative (Details)
$ in Millions
9 Months Ended
Sep. 30, 2016
USD ($)
Floating Rate Reverse Mortgage Loans [Member]  
Other Commitments [Line Items]  
Additional borrowing capacity to borrowers $ 1,100.0
Forward Mortgage Loan Interest Rate Lock Commitments [Member]  
Other Commitments [Line Items]  
Short-term commitments to lend 458.9
Reverse Mortgage Loan Interest Rate Lock Commitments [Member]  
Other Commitments [Line Items]  
Short-term commitments to lend $ 31.1
Altisource [Member]  
Other Commitments [Line Items]  
Automatic renewal term of support services agreement 1 year