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Fair Value - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments and Nonfinancial Assets Measured at Fair Value on a Recurring or Non-recurring basis or Disclosed, but not Carried, at Fair Value (Footnote) (Details) - Impaired Government Insured Stratum [Member]
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Servicing asset at carrying value $ 158.0
Valuation allowance of MSRs $ 24.8