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Advances - Schedule of Advance Payments by Financial Institution on Foreclosed Properties (Footnote) (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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Servicing, Foreclosures, Bankruptcy and Other [Member] |  |  |
Advances On Behalf of Borrowers [Line Items] |  |  |
Allowance for losses | $ 60.4 | $ 70.0 | $ 38.4

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