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Fair Value Measurements - Measured on a Recurring Basis (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Assets |  |  |
Mortgage loans held for sale | $ 2,170.0 | $ 1,631.0 |
Mortgage loans held for investment | 118.0 | 119.0 |
Mortgage servicing rights | 3,481.0 | 3,665.0 |
Liabilities |  |  |
Mortgage servicing rights financing | 34.0 | 32.0 |
Derivative instruments at fair value, less than | 0.1 | 0.1 |
Recurring Fair Value Measurements |  |  |
Assets |  |  |
Mortgage loans held for sale | 2,170.2 | 1,630.8 |
Mortgage loans held for investment | 117.8 | 119.1 |
Mortgage servicing rights | 3,481.0 | 3,665.4 |
Derivative financial instruments | 72.0 | 49.0 |
Total assets | 5,841.2 | 5,464.7 |
Liabilities |  |  |
Mortgage servicing rights financing | 33.7 | 31.7 |
Excess spread financing | 1,309.2 | 1,184.4 |
Total liabilities | 1,364.4 | 1,235.8 |
Recurring Fair Value Measurements | IRLCs |  |  |
Assets |  |  |
Derivative financial instruments | 68.9 | 47.6 |
Liabilities |  |  |
Derivative financial instruments | 0.0 |  |
Recurring Fair Value Measurements | Forward sales of MBS |  |  |
Assets |  |  |
Derivative financial instruments | 1.3 | 0.1 |
Liabilities |  |  |
Derivative financial instruments | 21.3 | 19.3 |
Recurring Fair Value Measurements | LPCs |  |  |
Assets |  |  |
Derivative financial instruments | 2.0 | 1.7 |
Liabilities |  |  |
Derivative financial instruments | 0.2 | 0.4 |
Recurring Fair Value Measurements | Eurodollar futures |  |  |
Assets |  |  |
Derivative financial instruments | 0.0 | 0.0 |
Liabilities |  |  |
Derivative financial instruments | 0.0 | 0.0 |
Recurring Fair Value Measurements | Level 1 |  |  |
Assets |  |  |
Mortgage loans held for sale | 0.0 | 0.0 |
Mortgage loans held for investment | 0.0 | 0.0 |
Mortgage servicing rights | 0.0 | 0.0 |
Derivative financial instruments | 0.0 | 0.0 |
Total assets | 0.0 | 0.0 |
Liabilities |  |  |
Mortgage servicing rights financing | 0.0 | 0.0 |
Excess spread financing | 0.0 | 0.0 |
Total liabilities | 0.0 | 0.0 |
Recurring Fair Value Measurements | Level 1 | IRLCs |  |  |
Assets |  |  |
Derivative financial instruments | 0.0 | 0.0 |
Liabilities |  |  |
Derivative financial instruments | 0.0 |  |
Recurring Fair Value Measurements | Level 1 | Forward sales of MBS |  |  |
Assets |  |  |
Derivative financial instruments | 0.0 | 0.0 |
Liabilities |  |  |
Derivative financial instruments | 0.0 | 0.0 |
Recurring Fair Value Measurements | Level 1 | LPCs |  |  |
Assets |  |  |
Derivative financial instruments | 0.0 | 0.0 |
Liabilities |  |  |
Derivative financial instruments | 0.0 | 0.0 |
Recurring Fair Value Measurements | Level 1 | Eurodollar futures |  |  |
Assets |  |  |
Derivative financial instruments | 0.0 | 0.0 |
Liabilities |  |  |
Derivative financial instruments | 0.0 | 0.0 |
Recurring Fair Value Measurements | Level 2 |  |  |
Assets |  |  |
Mortgage loans held for sale | 2,170.2 | 1,630.8 |
Mortgage loans held for investment | 0.0 | 0.0 |
Mortgage servicing rights | 0.0 | 0.0 |
Derivative financial instruments | 72.0 | 49.0 |
Total assets | 2,242.4 | 1,680.2 |
Liabilities |  |  |
Mortgage servicing rights financing | 0.0 | 0.0 |
Excess spread financing | 0.0 | 0.0 |
Total liabilities | 21.5 | 19.7 |
Recurring Fair Value Measurements | Level 2 | IRLCs |  |  |
Assets |  |  |
Derivative financial instruments | 68.9 | 47.6 |
Liabilities |  |  |
Derivative financial instruments | 0.0 |  |
Recurring Fair Value Measurements | Level 2 | Forward sales of MBS |  |  |
Assets |  |  |
Derivative financial instruments | 1.3 | 0.1 |
Liabilities |  |  |
Derivative financial instruments | 21.3 | 19.3 |
Recurring Fair Value Measurements | Level 2 | LPCs |  |  |
Assets |  |  |
Derivative financial instruments | 2.0 | 1.7 |
Liabilities |  |  |
Derivative financial instruments | 0.2 | 0.4 |
Recurring Fair Value Measurements | Level 2 | Eurodollar futures |  |  |
Assets |  |  |
Derivative financial instruments | 0.0 | 0.0 |
Liabilities |  |  |
Derivative financial instruments | 0.0 | 0.0 |
Recurring Fair Value Measurements | Level 3 |  |  |
Assets |  |  |
Mortgage loans held for sale | 0.0 | 0.0 |
Mortgage loans held for investment | 117.8 | 119.1 |
Mortgage servicing rights | 3,481.0 | 3,665.4 |
Derivative financial instruments | 0.0 | 0.0 |
Total assets | 3,598.8 | 3,784.5 |
Liabilities |  |  |
Mortgage servicing rights financing | 33.7 | 31.7 |
Excess spread financing | 1,309.2 | 1,184.4 |
Total liabilities | 1,342.9 | 1,216.1 |
Recurring Fair Value Measurements | Level 3 | IRLCs |  |  |
Assets |  |  |
Derivative financial instruments | 0.0 | 0.0 |
Liabilities |  |  |
Derivative financial instruments | 0.0 |  |
Recurring Fair Value Measurements | Level 3 | Forward sales of MBS |  |  |
Assets |  |  |
Derivative financial instruments | 0.0 | 0.0 |
Liabilities |  |  |
Derivative financial instruments | 0.0 | 0.0 |
Recurring Fair Value Measurements | Level 3 | LPCs |  |  |
Assets |  |  |
Derivative financial instruments | 0.0 | 0.0 |
Liabilities |  |  |
Derivative financial instruments | 0.0 | 0.0 |
Recurring Fair Value Measurements | Level 3 | Eurodollar futures |  |  |
Assets |  |  |
Derivative financial instruments | 0.0 | 0.0 |
Liabilities |  |  |
Derivative financial instruments | $ 0.0 | $ 0.0 |
Predecessor |  |  |
Liabilities |  |  |
Derivative instruments at fair value, less than |  |  | $ 0.1

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