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Fair Value - Schedule of Fair Value Assets and Liabilities (Footnote) (Details) - Carrying Value [Member] - Impaired Government Insured Stratum [Member]
$ in Millions
Sep. 30, 2015
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
MSRs, at amortized cost $ 144.2
Valuation allowance $ 25.1