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Mortgage Servicing - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Feb. 26, 2014
Dec. 31, 2013
Dec. 31, 2012
Servicing Asset at Amortized Cost [Line Items]            
UPB of small-balance commercial assets $ 2,300.0 $ 1,900.0 $ 2,400.0   $ 2,600.0 $ 2,100.0
Float balances 3,400.0 $ 2,000.0 $ 3,700.0   $ 3,200.0 $ 1,300.0
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    
HLSS [Member]            
Servicing Asset at Amortized Cost [Line Items]            
Reimbursements on account of loss of servicing revenues $ 2.0