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Derivative Financial Instruments - Derivative Instruments (Details) - USD ($) $ in Millions | 2 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Jul. 31, 2018 | Dec. 31, 2017
Derivatives, Fair Value [Line Items] |  |  |
Derivative instruments at fair value, less than | $ 0.1 |  |
Derivative Assets | Loan sale commitments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset | 428.0 |  |
Fair Value - Asset | 6.9 |  |
Recorded Gains / (Losses) | (3.7) |  |
Derivative Assets | IRLCs |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset | 1,765.0 |  |
Fair Value - Asset | 57.8 |  |
Recorded Gains / (Losses) | (1.8) |  |
Derivative Assets | Forward sales of MBS |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset | 3,040.0 |  |
Fair Value - Asset | 12.2 |  |
Recorded Gains / (Losses) | 9.0 |  |
Derivative Assets | LPCs |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset | 228.0 |  |
Fair Value - Asset | 1.7 |  |
Recorded Gains / (Losses) | 0.5 |  |
Derivative Assets | Treasury futures |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset | 65.0 |  |
Fair Value - Asset | 0.0 |  |
Recorded Gains / (Losses) | 0.0 |  |
Derivative Assets | Eurodollar futures |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset | 20.0 |  |
Fair Value - Asset | 0.0 |  |
Recorded Gains / (Losses) | 0.0 |  |
Derivative Liabilities | IRLCs |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability | 3.0 |  |
Fair Value - Liability | 0.0 |  |
Recorded Gains / (Losses) | 0.0 |  |
Derivative Liabilities | Forward sales of MBS |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability | 413.0 |  |
Fair Value - Liability | 0.5 |  |
Recorded Gains / (Losses) | (1.4) |  |
Derivative Liabilities | LPCs |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability | 320.0 |  |
Fair Value - Liability | 1.5 |  |
Recorded Gains / (Losses) | 0.9 |  |
Derivative Liabilities | Treasury futures |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability | 53.0 |  |
Fair Value - Liability | 0.1 |  |
Recorded Gains / (Losses) | 0.1 |  |
Derivative Liabilities | Eurodollar futures |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability | 6.0 |  |
Fair Value - Liability | 0.0 |  |
Recorded Gains / (Losses) | $ 0.0 |  |
Predecessor |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative instruments at fair value, less than |  |  | $ 0.1
Predecessor | Derivative Assets | Loan sale commitments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset |  |  | 1.0
Fair Value - Asset |  |  | 0.1
Recorded Gains / (Losses) |  | $ 10.5 | 0.0
Predecessor | Derivative Assets | IRLCs |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset |  |  | 2,531.0
Fair Value - Asset |  |  | 68.7
Recorded Gains / (Losses) |  | 0.4 | (23.5)
Predecessor | Derivative Assets | Forward sales of MBS |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset |  |  | 2,524.0
Fair Value - Asset |  |  | 4.7
Recorded Gains / (Losses) |  | 0.9 | (34.5)
Predecessor | Derivative Assets | LPCs |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset |  |  | 132.0
Fair Value - Asset |  |  | 1.0
Recorded Gains / (Losses) |  | 0.3 | (0.9)
Predecessor | Derivative Assets | Treasury futures |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset |  |  | 255.0
Fair Value - Asset |  |  | 2.0
Recorded Gains / (Losses) |  | (1.8) | 2.0
Predecessor | Derivative Assets | Eurodollar futures |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset |  |  | 11.0
Fair Value - Asset |  |  | 0.0
Recorded Gains / (Losses) |  | 0.0 | 0.0
Predecessor | Derivative Assets | Interest rate swaps |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset |  |  | 0.0
Fair Value - Asset |  |  | 0.0
Recorded Gains / (Losses) |  |  | (0.1)
Predecessor | Derivative Liabilities | IRLCs |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability |  |  | 7.0
Fair Value - Liability |  |  | 0.0
Recorded Gains / (Losses) |  | 0.0 | 1.1
Predecessor | Derivative Liabilities | Forward sales of MBS |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability |  |  | 1,137.0
Fair Value - Liability |  |  | 3.2
Recorded Gains / (Losses) |  | (1.0) | 6.8
Predecessor | Derivative Liabilities | LPCs |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability |  |  | 335.0
Fair Value - Liability |  |  | 1.2
Recorded Gains / (Losses) |  | 0.1 | 0.3
Predecessor | Derivative Liabilities | Treasury futures |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability |  |  | 479.0
Fair Value - Liability |  |  | 2.0
Recorded Gains / (Losses) |  | (1.3) | (2.0)
Predecessor | Derivative Liabilities | Eurodollar futures |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability |  |  | 45.0
Fair Value - Liability |  |  | 0.0
Recorded Gains / (Losses) |  | $ 0.0 | 0.0
Predecessor | Derivative Liabilities | Interest rate swaps |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability |  |  | 0.0
Fair Value - Liability |  |  | 0.0
Recorded Gains / (Losses) |  |  | $ 0.1

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- Definition Aggregate net fair value of all derivative instruments designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations. + References No definition available. + Details
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