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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
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Valuation allowance $ 29.6 $ 28.2
MSRs, at amortized cost $ 171.2 $ 172.9