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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
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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- Definition

[Line Items] for Advances On Behalf of Borrowers [Table]

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Advances, Payments on Behalf of by Borrower, Allowances for Losses

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