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Fair Value - Schedule of Fair Value Assets and Liabilities (Footnote) (Details) - Impaired Government Insured Stratum [Member] - Carrying Value [Member] - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Valuation allowance $ 54.5 $ 17.3
MSRs, at amortized cost $ 172.4 $ 146.5