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Mortgage Servicing - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Servicing Asset at Amortized Cost [Line Items]        
Unpaid principal balance of small balance commercial loans serviced   $ 2,000.0 $ 2,300.0 $ 2,400.0
Float balances   $ 3,400.0   $ 4,100.0
HLSS [Member]        
Servicing Asset at Amortized Cost [Line Items]        
Reimbursements on account of loss of servicing revenues $ 2.2