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Derivative Financial Instruments - Derivative Instruments (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Derivatives, Fair Value [Line Items] |  |  |
Derivative instruments at fair value, less than | $ 0.1 |  | $ 0.1
Derivative Assets | Loan sale commitments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset | 365.0 |  |
Fair Value - Asset | 17.2 |  |
Recorded Gains/(Losses) | (8.7) |  |
Derivative Assets | IRLCs |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset | 2,557.0 |  |
Fair Value - Asset | 68.9 |  |
Recorded Gains/(Losses) | 9.1 |  |
Derivative Assets | Forward sales of MBS |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset | 410.0 |  |
Fair Value - Asset | 1.3 |  |
Recorded Gains/(Losses) | (0.5) |  |
Derivative Assets | LPCs |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset | 216.0 |  |
Fair Value - Asset | 2.0 |  |
Recorded Gains/(Losses) | 0.3 |  |
Derivative Assets | Eurodollar futures |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset | 7.0 |  |
Fair Value - Asset | 0.0 |  |
Recorded Gains/(Losses) | 0.0 |  |
Derivative Liabilities | IRLCs |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability | 0.0 |  |
Fair Value - Liability | 0.0 |  |
Recorded Gains/(Losses) | 0.0 |  |
Derivative Liabilities | Forward sales of MBS |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability | 3,804.0 |  |
Fair Value - Liability | 21.3 |  |
Recorded Gains/(Losses) | (2.6) |  |
Derivative Liabilities | LPCs |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability | 52.0 |  |
Fair Value - Liability | 0.2 |  |
Recorded Gains/(Losses) | (0.2) |  |
Derivative Liabilities | Eurodollar futures |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability | 13.0 |  |
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 |  | 427.0 |
Fair Value - Asset |  | 8.9 |
Recorded Gains/(Losses) |  | 8.8 |
Predecessor | Derivative Assets | IRLCs |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset |  | 1,968.0 |
Fair Value - Asset |  | 57.4 |
Recorded Gains/(Losses) |  | (1.9) |
Predecessor | Derivative Assets | Forward sales of MBS |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset |  | 1,130.0 |
Fair Value - Asset |  | 5.7 |
Recorded Gains/(Losses) |  | 3.3 |
Predecessor | Derivative Assets | LPCs |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset |  | 223.0 |
Fair Value - Asset |  | 1.0 |
Recorded Gains/(Losses) |  | 0.1 |
Predecessor | Derivative Assets | Treasury futures |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset |  | 331.0 |
Fair Value - Asset |  | 1.3 |
Recorded Gains/(Losses) |  | (0.6) |
Predecessor | Derivative Assets | Eurodollar futures |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset |  | 30.0 |
Fair Value - Asset |  | 0.0 |
Recorded Gains/(Losses) |  | 0.0 |
Predecessor | Derivative Liabilities | IRLCs |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability |  | 8.0 |
Fair Value - Liability |  | 0.0 |
Recorded Gains/(Losses) |  | 0.0 |
Predecessor | Derivative Liabilities | Forward sales of MBS |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability |  | 2,384.0 |
Fair Value - Liability |  | 7.3 |
Recorded Gains/(Losses) |  | 4.5 |
Predecessor | Derivative Liabilities | LPCs |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability |  | 116.0 |
Fair Value - Liability |  | 0.5 |
Recorded Gains/(Losses) |  | (0.1) |
Predecessor | Derivative Liabilities | Treasury futures |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability |  | 223.0 |
Fair Value - Liability |  | 1.2 |
Recorded Gains/(Losses) |  | (0.2) |
Predecessor | Derivative Liabilities | Eurodollar futures |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability |  | 6.0 |
Fair Value - Liability |  | 0.0 |
Recorded Gains/(Losses) |  | $ 0.0 |

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