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Fair Value Measurements - Fair Value by Balance Sheet Line Item (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financial assets |  |
Restricted cash | $ 319.0 |
Reverse mortgage interests, net | 7,934.0 |
Mortgage loans held for sale | 1,631.0 |
Mortgage loans held for investment, net | 119.0 |
Financial liabilities |  |
Unsecured senior notes | 2,459.0 |
Advance facilities, net | 595.0 |
Warehouse facilities | 2,349.0 |
Other nonrecourse debt, net | 6,795.0 |
Participating interest financing |  |
Financial liabilities |  |
Other nonrecourse debt, net | 5,607.0 |
Trust 2016-2 |  |
Financial liabilities |  |
Other nonrecourse debt, net | 0.0 |
Trust 2016-3 |  |
Financial liabilities |  |
Other nonrecourse debt, net | 0.0 |
Trust 2017-1 |  |
Financial liabilities |  |
Other nonrecourse debt, net | 0.0 |
Trust 2017-2 |  |
Financial liabilities |  |
Other nonrecourse debt, net | 231.0 |
Trust 2018-1 |  |
Financial liabilities |  |
Other nonrecourse debt, net | 284.0 |
Trust 2018-2 |  |
Financial liabilities |  |
Other nonrecourse debt, net | 250.0 |
Trust 2018-3 |  |
Financial liabilities |  |
Other nonrecourse debt, net | 326.0 |
Nonrecourse debt - legacy assets |  |
Financial liabilities |  |
Other nonrecourse debt, net | 29.0 |
Fair Value, Measurements, Recurring |  |
Financial assets |  |
Cash and cash equivalents | 242.0 |
Restricted cash | 319.0 |
Advances and other receivables, net | 1,194.0 |
Reverse mortgage interests, net | 7,934.0 |
Mortgage loans held for sale | 1,630.8 |
Mortgage loans held for investment, net | 119.1 |
Derivative financial instruments | 49.0 |
Financial liabilities |  |
Unsecured senior notes | 2,459.0 |
Advance facilities, net | 595.0 |
Warehouse facilities | 2,349.0 |
Mortgage servicing rights financing liability | 31.7 |
Excess spread financing | 1,184.0 |
Derivative financial instruments | 20.0 |
Fair Value, Measurements, Recurring | Participating interest financing |  |
Financial liabilities |  |
Other nonrecourse debt, net | 5,675.0 |
Fair Value, Measurements, Recurring | Trust 2017-2 |  |
Financial liabilities |  |
Other nonrecourse debt, net | 231.0 |
Fair Value, Measurements, Recurring | Trust 2018-1 |  |
Financial liabilities |  |
Other nonrecourse debt, net | 284.0 |
Fair Value, Measurements, Recurring | Trust 2018-2 |  |
Financial liabilities |  |
Other nonrecourse debt, net | 250.0 |
Fair Value, Measurements, Recurring | Trust 2018-3 |  |
Financial liabilities |  |
Other nonrecourse debt, net | 326.0 |
Fair Value, Measurements, Recurring | Nonrecourse debt - legacy assets |  |
Financial liabilities |  |
Other nonrecourse debt, net | 29.0 |
Fair Value, Measurements, Recurring | Level 1 |  |
Financial assets |  |
Cash and cash equivalents | 242.0 |
Restricted cash | 319.0 |
Advances and other receivables, net | 0.0 |
Reverse mortgage interests, net | 0.0 |
Mortgage loans held for sale | 0.0 |
Mortgage loans held for investment, net | 0.0 |
Derivative financial instruments | 0.0 |
Financial liabilities |  |
Unsecured senior notes | 2,451.0 |
Advance facilities, net | 0.0 |
Warehouse facilities | 0.0 |
Mortgage servicing rights financing liability | 0.0 |
Excess spread financing | 0.0 |
Derivative financial instruments | 0.0 |
Fair Value, Measurements, Recurring | Level 1 | Participating interest financing |  |
Financial liabilities |  |
Other nonrecourse debt, net | 0.0 |
Fair Value, Measurements, Recurring | Level 1 | Trust 2017-2 |  |
Financial liabilities |  |
Other nonrecourse debt, net | 0.0 |
Fair Value, Measurements, Recurring | Level 1 | Trust 2018-1 |  |
Financial liabilities |  |
Other nonrecourse debt, net | 0.0 |
Fair Value, Measurements, Recurring | Level 1 | Trust 2018-2 |  |
Financial liabilities |  |
Other nonrecourse debt, net | 0.0 |
Fair Value, Measurements, Recurring | Level 1 | Trust 2018-3 |  |
Financial liabilities |  |
Other nonrecourse debt, net | 0.0 |
Fair Value, Measurements, Recurring | Level 1 | Nonrecourse debt - legacy assets |  |
Financial liabilities |  |
Other nonrecourse debt, net | 0.0 |
Fair Value, Measurements, Recurring | Level 2 |  |
Financial assets |  |
Cash and cash equivalents | 0.0 |
Restricted cash | 0.0 |
Advances and other receivables, net | 0.0 |
Reverse mortgage interests, net | 0.0 |
Mortgage loans held for sale | 1,630.8 |
Mortgage loans held for investment, net | 0.0 |
Derivative financial instruments | 49.0 |
Financial liabilities |  |
Unsecured senior notes | 0.0 |
Advance facilities, net | 595.0 |
Warehouse facilities | 2,349.0 |
Mortgage servicing rights financing liability | 0.0 |
Excess spread financing | 0.0 |
Derivative financial instruments | 20.0 |
Fair Value, Measurements, Recurring | Level 2 | Participating interest financing |  |
Financial liabilities |  |
Other nonrecourse debt, net | 0.0 |
Fair Value, Measurements, Recurring | Level 2 | Trust 2017-2 |  |
Financial liabilities |  |
Other nonrecourse debt, net | 0.0 |
Fair Value, Measurements, Recurring | Level 2 | Trust 2018-1 |  |
Financial liabilities |  |
Other nonrecourse debt, net | 0.0 |
Fair Value, Measurements, Recurring | Level 2 | Trust 2018-2 |  |
Financial liabilities |  |
Other nonrecourse debt, net | 0.0 |
Fair Value, Measurements, Recurring | Level 2 | Trust 2018-3 |  |
Financial liabilities |  |
Other nonrecourse debt, net | 0.0 |
Fair Value, Measurements, Recurring | Level 2 | Nonrecourse debt - legacy assets |  |
Financial liabilities |  |
Other nonrecourse debt, net | 0.0 |
Fair Value, Measurements, Recurring | Level 3 |  |
Financial assets |  |
Cash and cash equivalents | 0.0 |
Restricted cash | 0.0 |
Advances and other receivables, net | 1,194.0 |
Reverse mortgage interests, net | 7,942.0 |
Mortgage loans held for sale | 0.0 |
Mortgage loans held for investment, net | 119.1 |
Derivative financial instruments | 0.0 |
Financial liabilities |  |
Unsecured senior notes | 0.0 |
Advance facilities, net | 0.0 |
Warehouse facilities | 0.0 |
Mortgage servicing rights financing liability | 31.7 |
Excess spread financing | 1,184.0 |
Derivative financial instruments | 0.0 |
Fair Value, Measurements, Recurring | Level 3 | Participating interest financing |  |
Financial liabilities |  |
Other nonrecourse debt, net | 5,672.0 |
Fair Value, Measurements, Recurring | Level 3 | Trust 2017-2 |  |
Financial liabilities |  |
Other nonrecourse debt, net | 230.0 |
Fair Value, Measurements, Recurring | Level 3 | Trust 2018-1 |  |
Financial liabilities |  |
Other nonrecourse debt, net | 284.0 |
Fair Value, Measurements, Recurring | Level 3 | Trust 2018-2 |  |
Financial liabilities |  |
Other nonrecourse debt, net | 249.0 |
Fair Value, Measurements, Recurring | Level 3 | Trust 2018-3 |  |
Financial liabilities |  |
Other nonrecourse debt, net | 326.0 |
Fair Value, Measurements, Recurring | Level 3 | Nonrecourse debt - legacy assets |  |
Financial liabilities |  |
Other nonrecourse debt, net | $ 28.0 |
Predecessor |  |
Financial assets |  |
Restricted cash |  | $ 360.0
Reverse mortgage interests, net |  | 9,984.0
Mortgage loans held for sale |  | 1,891.0
Mortgage loans held for investment, net |  | 139.0
Financial liabilities |  |
Unsecured senior notes |  | 1,874.0
Advance facilities, net |  | 855.0
Warehouse facilities |  | 3,285.0
Mortgage servicing rights financing liability |  | 9.5
Other nonrecourse debt, net |  | 8,014.0
Predecessor | Participating interest financing |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 7,111.0
Predecessor | Trust 2016-2 |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 94.0
Predecessor | Trust 2016-3 |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 138.0
Predecessor | Trust 2017-1 |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 213.0
Predecessor | Trust 2017-2 |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 365.0
Predecessor | Trust 2018-1 |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 0.0
Predecessor | Trust 2018-2 |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 0.0
Predecessor | Trust 2018-3 |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 0.0
Predecessor | Nonrecourse debt - legacy assets |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 42.0
Predecessor | Fair Value, Measurements, Recurring |  |
Financial assets |  |
Cash and cash equivalents |  | 215.0
Restricted cash |  | 360.0
Advances and other receivables, net |  | 1,706.0
Reverse mortgage interests, net |  | 9,984.0
Mortgage loans held for sale |  | 1,890.8
Mortgage loans held for investment, net |  | 139.0
Derivative financial instruments |  | 65.0
Financial liabilities |  |
Unsecured senior notes |  | 1,874.0
Advance facilities, net |  | 855.0
Warehouse facilities |  | 3,285.0
Mortgage servicing rights financing liability |  | 9.5
Excess spread financing |  | 996.0
Derivative financial instruments |  | 5.0
Predecessor | Fair Value, Measurements, Recurring | Participating interest financing |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 7,167.0
Predecessor | Fair Value, Measurements, Recurring | Trust 2016-2 |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 94.0
Predecessor | Fair Value, Measurements, Recurring | Trust 2016-3 |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 138.0
Predecessor | Fair Value, Measurements, Recurring | Trust 2017-1 |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 213.0
Predecessor | Fair Value, Measurements, Recurring | Trust 2017-2 |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 365.0
Predecessor | Fair Value, Measurements, Recurring | Nonrecourse debt - legacy assets |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 37.0
Predecessor | Fair Value, Measurements, Recurring | Level 1 |  |
Financial assets |  |
Cash and cash equivalents |  | 215.0
Restricted cash |  | 360.0
Advances and other receivables, net |  | 0.0
Reverse mortgage interests, net |  | 0.0
Mortgage loans held for sale |  | 0.0
Mortgage loans held for investment, net |  | 0.0
Derivative financial instruments |  | 0.0
Financial liabilities |  |
Unsecured senior notes |  | 1,912.0
Advance facilities, net |  | 0.0
Warehouse facilities |  | 0.0
Mortgage servicing rights financing liability |  | 0.0
Excess spread financing |  | 0.0
Derivative financial instruments |  | 0.0
Predecessor | Fair Value, Measurements, Recurring | Level 1 | Participating interest financing |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 0.0
Predecessor | Fair Value, Measurements, Recurring | Level 1 | Trust 2016-2 |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 0.0
Predecessor | Fair Value, Measurements, Recurring | Level 1 | Trust 2016-3 |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 0.0
Predecessor | Fair Value, Measurements, Recurring | Level 1 | Trust 2017-1 |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 0.0
Predecessor | Fair Value, Measurements, Recurring | Level 1 | Trust 2017-2 |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 0.0
Predecessor | Fair Value, Measurements, Recurring | Level 1 | Nonrecourse debt - legacy assets |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 0.0
Predecessor | Fair Value, Measurements, Recurring | Level 2 |  |
Financial assets |  |
Cash and cash equivalents |  | 0.0
Restricted cash |  | 0.0
Advances and other receivables, net |  | 0.0
Reverse mortgage interests, net |  | 0.0
Mortgage loans held for sale |  | 1,890.8
Mortgage loans held for investment, net |  | 0.0
Derivative financial instruments |  | 65.0
Financial liabilities |  |
Unsecured senior notes |  | 0.0
Advance facilities, net |  | 855.0
Warehouse facilities |  | 3,286.0
Mortgage servicing rights financing liability |  | 0.0
Excess spread financing |  | 0.0
Derivative financial instruments |  | 5.0
Predecessor | Fair Value, Measurements, Recurring | Level 2 | Participating interest financing |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 7,353.0
Predecessor | Fair Value, Measurements, Recurring | Level 2 | Trust 2016-2 |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 0.0
Predecessor | Fair Value, Measurements, Recurring | Level 2 | Trust 2016-3 |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 0.0
Predecessor | Fair Value, Measurements, Recurring | Level 2 | Trust 2017-1 |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 0.0
Predecessor | Fair Value, Measurements, Recurring | Level 2 | Trust 2017-2 |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 0.0
Predecessor | Fair Value, Measurements, Recurring | Level 2 | Nonrecourse debt - legacy assets |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 0.0
Predecessor | Fair Value, Measurements, Recurring | Level 3 |  |
Financial assets |  |
Cash and cash equivalents |  | 0.0
Restricted cash |  | 0.0
Advances and other receivables, net |  | 1,706.0
Reverse mortgage interests, net |  | 10,164.0
Mortgage loans held for sale |  | 0.0
Mortgage loans held for investment, net |  | 139.0
Derivative financial instruments |  | 0.0
Financial liabilities |  |
Unsecured senior notes |  | 0.0
Advance facilities, net |  | 0.0
Warehouse facilities |  | 0.0
Mortgage servicing rights financing liability |  | 10.0
Excess spread financing |  | 996.0
Derivative financial instruments |  | 0.0
Predecessor | Fair Value, Measurements, Recurring | Level 3 | Participating interest financing |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 0.0
Predecessor | Fair Value, Measurements, Recurring | Level 3 | Trust 2016-2 |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 112.0
Predecessor | Fair Value, Measurements, Recurring | Level 3 | Trust 2016-3 |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 155.0
Predecessor | Fair Value, Measurements, Recurring | Level 3 | Trust 2017-1 |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 225.0
Predecessor | Fair Value, Measurements, Recurring | Level 3 | Trust 2017-2 |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | 371.0
Predecessor | Fair Value, Measurements, Recurring | Level 3 | Nonrecourse debt - legacy assets |  |
Financial liabilities |  |
Other nonrecourse debt, net |  | $ 36.0

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