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Advances - Schedule of Advances Paid on Behalf of Borrowers or on Foreclosed Properties (Footnote) (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Servicing, Foreclosures, Bankruptcy and Other [Member]    
Advances On Behalf of Borrowers [Line Items]    
Allowance for losses on advances $ 59.5 $ 70.0