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Fair Value Measurements - Measured on a Recurring Basis (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
--- | --- | --- | ---
Assets |  |  |
Mortgage loans held for sale | $ 3,422.0 | $ 1,631.0 |
Mortgage loans held for investment | 114.0 | 119.0 |
Mortgage servicing rights | 3,505.0 | 3,665.0 |
Liabilities |  |  |
Mortgage servicing rights financing | 43.0 | 32.0 |
Derivative instruments at fair value, less than | 0.1 | 0.1 | $ 0.1
Recurring Fair Value Measurements |  |  |
Assets |  |  |
Mortgage loans held for sale | 3,421.6 | 1,630.8 |
Mortgage loans held for investment | 114.3 | 119.1 |
Mortgage servicing rights | 3,504.5 | 3,665.4 |
Derivative financial instruments | 128.0 | 49.0 |
Total assets | 7,168.2 | 5,464.7 |
Liabilities |  |  |
Mortgage servicing rights financing | 42.6 | 31.7 |
Excess spread financing | 1,429.4 | 1,184.4 |
Total liabilities | 1,503.6 | 1,235.8 |
Recurring Fair Value Measurements | IRLCs |  |  |
Assets |  |  |
Derivative financial instruments | 110.2 | 47.6 |
Liabilities |  |  |
Derivative financial instruments | 0.0 |  |
Recurring Fair Value Measurements | Forward sales of MBS |  |  |
Assets |  |  |
Derivative financial instruments | 1.1 | 0.1 |
Liabilities |  |  |
Derivative financial instruments | 30.3 | 19.3 |
Recurring Fair Value Measurements | LPCs |  |  |
Assets |  |  |
Derivative financial instruments | 16.5 | 1.7 |
Liabilities |  |  |
Derivative financial instruments | 1.3 | 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 | 3,421.6 | 1,630.8 |
Mortgage loans held for investment | 0.0 | 0.0 |
Mortgage servicing rights | 0.0 | 0.0 |
Derivative financial instruments | 128.0 | 49.0 |
Total assets | 3,549.4 | 1,680.2 |
Liabilities |  |  |
Mortgage servicing rights financing | 0.0 | 0.0 |
Excess spread financing | 0.0 | 0.0 |
Total liabilities | 31.6 | 19.7 |
Recurring Fair Value Measurements | Level 2 | IRLCs |  |  |
Assets |  |  |
Derivative financial instruments | 110.2 | 47.6 |
Liabilities |  |  |
Derivative financial instruments | 0.0 |  |
Recurring Fair Value Measurements | Level 2 | Forward sales of MBS |  |  |
Assets |  |  |
Derivative financial instruments | 1.1 | 0.1 |
Liabilities |  |  |
Derivative financial instruments | 30.3 | 19.3 |
Recurring Fair Value Measurements | Level 2 | LPCs |  |  |
Assets |  |  |
Derivative financial instruments | 16.5 | 1.7 |
Liabilities |  |  |
Derivative financial instruments | 1.3 | 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 | 114.3 | 119.1 |
Mortgage servicing rights | 3,504.5 | 3,665.4 |
Derivative financial instruments | 0.0 | 0.0 |
Total assets | 3,618.8 | 3,784.5 |
Liabilities |  |  |
Mortgage servicing rights financing | 42.6 | 31.7 |
Excess spread financing | 1,429.4 | 1,184.4 |
Total liabilities | 1,472.0 | 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 |

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