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Fair Value Measurements - Measured on a Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
ASSETS |  |
Mortgage loans held for sale at fair value | $ 1,631.0 |
Mortgage loans held for investment | 119.0 |
Mortgage servicing rights | 3,665.0 |
LIABILITIES |  |
Derivative instrument, fair value (less than) | 0.1 | $ 0.1
Fair Value, Measurements, Recurring |  |
ASSETS |  |
Mortgage loans held for sale at fair value | 1,630.8 |
Mortgage loans held for investment | 119.1 |
Mortgage servicing rights | 3,665.4 |
Derivative financial instruments | 49.0 |
Total assets | 5,464.7 |
LIABILITIES |  |
Mortgage servicing rights financing liability | 31.7 |
Excess spread financing | 1,184.4 |
Total liabilities | 1,235.8 |
Fair Value, Measurements, Recurring | Level 1 |  |
ASSETS |  |
Mortgage loans held for sale at fair value | 0.0 |
Mortgage loans held for investment | 0.0 |
Mortgage servicing rights | 0.0 |
Derivative financial instruments | 0.0 |
Total assets | 0.0 |
LIABILITIES |  |
Mortgage servicing rights financing liability | 0.0 |
Excess spread financing | 0.0 |
Total liabilities | 0.0 |
Fair Value, Measurements, Recurring | Level 2 |  |
ASSETS |  |
Mortgage loans held for sale at fair value | 1,630.8 |
Mortgage loans held for investment | 0.0 |
Mortgage servicing rights | 0.0 |
Derivative financial instruments | 49.0 |
Total assets | 1,680.2 |
LIABILITIES |  |
Mortgage servicing rights financing liability | 0.0 |
Excess spread financing | 0.0 |
Total liabilities | 19.7 |
Fair Value, Measurements, Recurring | Level 3 |  |
ASSETS |  |
Mortgage loans held for sale at fair value | 0.0 |
Mortgage loans held for investment | 119.1 |
Mortgage servicing rights | 3,665.4 |
Derivative financial instruments | 0.0 |
Total assets | 3,784.5 |
LIABILITIES |  |
Mortgage servicing rights financing liability | 31.7 |
Excess spread financing | 1,184.4 |
Total liabilities | 1,216.1 |
IRLCs | Fair Value, Measurements, Recurring |  |
ASSETS |  |
Derivative financial instruments | 47.6 |
IRLCs | Fair Value, Measurements, Recurring | Level 1 |  |
ASSETS |  |
Derivative financial instruments | 0.0 |
IRLCs | Fair Value, Measurements, Recurring | Level 2 |  |
ASSETS |  |
Derivative financial instruments | 47.6 |
IRLCs | Fair Value, Measurements, Recurring | Level 3 |  |
ASSETS |  |
Derivative financial instruments | 0.0 |
Forward MBS trades | Fair Value, Measurements, Recurring |  |
ASSETS |  |
Derivative financial instruments | 0.1 |
LIABILITIES |  |
Derivative financial instruments | 19.3 |
Forward MBS trades | Fair Value, Measurements, Recurring | Level 1 |  |
ASSETS |  |
Derivative financial instruments | 0.0 |
LIABILITIES |  |
Derivative financial instruments | 0.0 |
Forward MBS trades | Fair Value, Measurements, Recurring | Level 2 |  |
ASSETS |  |
Derivative financial instruments | 0.1 |
LIABILITIES |  |
Derivative financial instruments | 19.3 |
Forward MBS trades | Fair Value, Measurements, Recurring | Level 3 |  |
ASSETS |  |
Derivative financial instruments | 0.0 |
LIABILITIES |  |
Derivative financial instruments | 0.0 |
LPCs | Fair Value, Measurements, Recurring |  |
ASSETS |  |
Derivative financial instruments | 1.7 |
LIABILITIES |  |
Derivative financial instruments | 0.4 |
LPCs | Fair Value, Measurements, Recurring | Level 1 |  |
ASSETS |  |
Derivative financial instruments | 0.0 |
LIABILITIES |  |
Derivative financial instruments | 0.0 |
LPCs | Fair Value, Measurements, Recurring | Level 2 |  |
ASSETS |  |
Derivative financial instruments | 1.7 |
LIABILITIES |  |
Derivative financial instruments | 0.4 |
LPCs | Fair Value, Measurements, Recurring | Level 3 |  |
ASSETS |  |
Derivative financial instruments | 0.0 |
LIABILITIES |  |
Derivative financial instruments | 0.0 |
Eurodollar futures | Fair Value, Measurements, Recurring |  |
ASSETS |  |
Derivative financial instruments | 0.0 |
LIABILITIES |  |
Derivative financial instruments | 0.0 |
Eurodollar futures | Fair Value, Measurements, Recurring | Level 1 |  |
ASSETS |  |
Derivative financial instruments | 0.0 |
LIABILITIES |  |
Derivative financial instruments | 0.0 |
Eurodollar futures | Fair Value, Measurements, Recurring | Level 2 |  |
ASSETS |  |
Derivative financial instruments | 0.0 |
LIABILITIES |  |
Derivative financial instruments | 0.0 |
Eurodollar futures | Fair Value, Measurements, Recurring | Level 3 |  |
ASSETS |  |
Derivative financial instruments | 0.0 |
LIABILITIES |  |
Derivative financial instruments | $ 0.0 |
Predecessor |  |
ASSETS |  |
Mortgage loans held for sale at fair value |  | 1,891.0
Mortgage loans held for investment |  | 139.0
Mortgage servicing rights |  | 2,937.0
LIABILITIES |  |
Mortgage servicing rights financing liability |  | 9.5
Predecessor | Fair Value, Measurements, Recurring |  |
ASSETS |  |
Mortgage loans held for sale at fair value |  | 1,890.8
Mortgage loans held for investment |  | 139.0
Mortgage servicing rights |  | 2,937.4
Derivative financial instruments |  | 65.0
Total assets |  | 4,892.7
LIABILITIES |  |
Mortgage servicing rights financing liability |  | 9.5
Excess spread financing |  | 996.5
Total liabilities |  | 1,010.8
Predecessor | Fair Value, Measurements, Recurring | Level 1 |  |
ASSETS |  |
Mortgage loans held for sale at fair value |  | 0.0
Mortgage loans held for investment |  | 0.0
Mortgage servicing rights |  | 0.0
Derivative financial instruments |  | 0.0
Total assets |  | 0.0
LIABILITIES |  |
Mortgage servicing rights financing liability |  | 0.0
Excess spread financing |  | 0.0
Total liabilities |  | 0.0
Predecessor | Fair Value, Measurements, Recurring | Level 2 |  |
ASSETS |  |
Mortgage loans held for sale at fair value |  | 1,890.8
Mortgage loans held for investment |  | 0.0
Mortgage servicing rights |  | 0.0
Derivative financial instruments |  | 65.0
Total assets |  | 1,955.3
LIABILITIES |  |
Mortgage servicing rights financing liability |  | 0.0
Excess spread financing |  | 0.0
Total liabilities |  | 4.8
Predecessor | Fair Value, Measurements, Recurring | Level 3 |  |
ASSETS |  |
Mortgage loans held for sale at fair value |  | 0.0
Mortgage loans held for investment |  | 139.0
Mortgage servicing rights |  | 2,937.4
Derivative financial instruments |  | 0.0
Total assets |  | 2,937.4
LIABILITIES |  |
Mortgage servicing rights financing liability |  | 10.0
Excess spread financing |  | 996.5
Total liabilities |  | 1,006.0
Predecessor | IRLCs | Fair Value, Measurements, Recurring |  |
ASSETS |  |
Derivative financial instruments |  | 59.3
Predecessor | IRLCs | Fair Value, Measurements, Recurring | Level 1 |  |
ASSETS |  |
Derivative financial instruments |  | 0.0
Predecessor | IRLCs | Fair Value, Measurements, Recurring | Level 2 |  |
ASSETS |  |
Derivative financial instruments |  | 59.3
Predecessor | IRLCs | Fair Value, Measurements, Recurring | Level 3 |  |
ASSETS |  |
Derivative financial instruments |  | 0.0
Predecessor | Forward MBS trades | Fair Value, Measurements, Recurring |  |
ASSETS |  |
Derivative financial instruments |  | 2.4
LIABILITIES |  |
Derivative financial instruments |  | 2.8
Predecessor | Forward MBS trades | Fair Value, Measurements, Recurring | Level 1 |  |
ASSETS |  |
Derivative financial instruments |  | 0.0
LIABILITIES |  |
Derivative financial instruments |  | 0.0
Predecessor | Forward MBS trades | Fair Value, Measurements, Recurring | Level 2 |  |
ASSETS |  |
Derivative financial instruments |  | 2.4
LIABILITIES |  |
Derivative financial instruments |  | 2.8
Predecessor | Forward MBS trades | Fair Value, Measurements, Recurring | Level 3 |  |
ASSETS |  |
Derivative financial instruments |  | 0.0
LIABILITIES |  |
Derivative financial instruments |  | 0.0
Predecessor | LPCs | Fair Value, Measurements, Recurring |  |
ASSETS |  |
Derivative financial instruments |  | 0.9
LIABILITIES |  |
Derivative financial instruments |  | 0.6
Predecessor | LPCs | Fair Value, Measurements, Recurring | Level 1 |  |
ASSETS |  |
Derivative financial instruments |  | 0.0
LIABILITIES |  |
Derivative financial instruments |  | 0.0
Predecessor | LPCs | Fair Value, Measurements, Recurring | Level 2 |  |
ASSETS |  |
Derivative financial instruments |  | 0.9
LIABILITIES |  |
Derivative financial instruments |  | 0.6
Predecessor | LPCs | Fair Value, Measurements, Recurring | Level 3 |  |
ASSETS |  |
Derivative financial instruments |  | 0.0
LIABILITIES |  |
Derivative financial instruments |  | 0.0
Predecessor | Eurodollar futures | Fair Value, Measurements, Recurring |  |
ASSETS |  |
Derivative financial instruments |  | 0.0
LIABILITIES |  |
Derivative financial instruments |  | 0.0
Predecessor | Eurodollar futures | Fair Value, Measurements, Recurring | Level 1 |  |
ASSETS |  |
Derivative financial instruments |  | 0.0
LIABILITIES |  |
Derivative financial instruments |  | 0.0
Predecessor | Eurodollar futures | Fair Value, Measurements, Recurring | Level 2 |  |
ASSETS |  |
Derivative financial instruments |  | 0.0
LIABILITIES |  |
Derivative financial instruments |  | 0.0
Predecessor | Eurodollar futures | Fair Value, Measurements, Recurring | Level 3 |  |
ASSETS |  |
Derivative financial instruments |  | 0.0
LIABILITIES |  |
Derivative financial instruments |  | 0.0
Predecessor | Treasury futures | Fair Value, Measurements, Recurring |  |
ASSETS |  |
Derivative financial instruments |  | 1.9
LIABILITIES |  |
Derivative financial instruments |  | 1.4
Predecessor | Treasury futures | Fair Value, Measurements, Recurring | Level 1 |  |
ASSETS |  |
Derivative financial instruments |  | 0.0
LIABILITIES |  |
Derivative financial instruments |  | 0.0
Predecessor | Treasury futures | Fair Value, Measurements, Recurring | Level 2 |  |
ASSETS |  |
Derivative financial instruments |  | 1.9
LIABILITIES |  |
Derivative financial instruments |  | 1.4
Predecessor | Treasury futures | Fair Value, Measurements, Recurring | Level 3 |  |
ASSETS |  |
Derivative financial instruments |  | 0.0
LIABILITIES |  |
Derivative financial instruments |  | $ 0.0

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