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Fair Value Measurements - Fair Value by Balance Sheet Line Item (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Financial assets |  |  |  |
Restricted cash | $ 283.0 | $ 319.0 | $ 430.0 | $ 360.0
Reverse mortgage interests, net | 6,279.0 | 7,934.0 |  |
Mortgage loans held for sale | 4,077.0 | 1,631.0 |  |
Mortgage loans held for investment, net | 0.0 | 119.0 |  |
Derivative financial instruments | 153.0 | 49.0 |  |
Financial liabilities |  |  |  |
Unsecured senior notes, net | 2,366.0 | 2,459.0 |  |
Advance facilities, net | 422.0 | 595.0 |  |
Warehouse facilities, net | 4,575.0 | 2,349.0 |  |
Other nonrecourse debt, net | 5,286.0 | 6,795.0 |  |
Participating interest financing |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 4,284.0 | 5,607.0 |  |
Trust 2019-2 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 333.0 | 0.0 |  |
Trust 2019-1 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 302.0 | 0.0 |  |
Trust 2018-3 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 209.0 | 326.0 |  |
Trust 2018-2 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 148.0 | 250.0 |  |
Trust 2018-1 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 0.0 | 284.0 |  |
Trust 2017-2 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 0.0 | 231.0 |  |
Nonrecourse debt - legacy assets |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 0.0 | 29.0 |  |
Fair Value, Measurements, Recurring |  |  |  |
Financial assets |  |  |  |
Cash and cash equivalents | 329.0 | 242.0 |  |
Restricted cash | 283.0 | 319.0 |  |
Advances and other receivables, net | 988.0 | 1,194.0 |  |
Mortgage loans held for sale | 4,077.0 | 1,630.8 |  |
Mortgage loans held for investment, net | 0.0 | 119.1 |  |
Derivative financial instruments | 153.0 | 49.0 |  |
Financial liabilities |  |  |  |
Advance facilities, net | 422.0 | 595.0 |  |
Warehouse facilities, net | 4,575.0 | 2,349.0 |  |
Mortgage servicing rights financing liability | 37.4 | 31.7 |  |
Excess spread financing | 1,311.0 | 1,184.0 |  |
Derivative financial instruments | 15.0 | 20.0 |  |
Fair Value, Measurements, Recurring | Level 1 |  |  |  |
Financial assets |  |  |  |
Cash and cash equivalents | 329.0 | 242.0 |  |
Restricted cash | 283.0 | 319.0 |  |
Advances and other receivables, net | 0.0 | 0.0 |  |
Mortgage loans held for sale | 0.0 | 0.0 |  |
Mortgage loans held for investment, net | 0.0 | 0.0 |  |
Derivative financial instruments | 0.0 | 0.0 |  |
Financial liabilities |  |  |  |
Advance facilities, net | 0.0 | 0.0 |  |
Warehouse facilities, net | 0.0 | 0.0 |  |
Mortgage servicing rights financing liability | 0.0 | 0.0 |  |
Excess spread financing | 0.0 | 0.0 |  |
Derivative financial instruments | 0.0 | 0.0 |  |
Fair Value, Measurements, Recurring | Level 2 |  |  |  |
Financial assets |  |  |  |
Cash and cash equivalents | 0.0 | 0.0 |  |
Restricted cash | 0.0 | 0.0 |  |
Advances and other receivables, net | 0.0 | 0.0 |  |
Mortgage loans held for sale | 4,077.0 | 1,630.8 |  |
Mortgage loans held for investment, net | 0.0 | 0.0 |  |
Derivative financial instruments | 153.0 | 49.0 |  |
Financial liabilities |  |  |  |
Advance facilities, net | 422.0 | 595.0 |  |
Warehouse facilities, net | 4,575.0 | 2,349.0 |  |
Mortgage servicing rights financing liability | 0.0 | 0.0 |  |
Excess spread financing | 0.0 | 0.0 |  |
Derivative financial instruments | 15.0 | 20.0 |  |
Fair Value, Measurements, Recurring | Level 3 |  |  |  |
Financial assets |  |  |  |
Cash and cash equivalents | 0.0 | 0.0 |  |
Restricted cash | 0.0 | 0.0 |  |
Advances and other receivables, net | 988.0 | 1,194.0 |  |
Mortgage loans held for sale | 0.0 | 0.0 |  |
Mortgage loans held for investment, net | 0.0 | 119.1 |  |
Derivative financial instruments | 0.0 | 0.0 |  |
Financial liabilities |  |  |  |
Advance facilities, net | 0.0 | 0.0 |  |
Warehouse facilities, net | 0.0 | 0.0 |  |
Mortgage servicing rights financing liability | 37.4 | 31.7 |  |
Excess spread financing | 1,311.0 | 1,184.0 |  |
Derivative financial instruments | 0.0 | 0.0 |  |
Fair Value, Nonrecurring |  |  |  |
Financial assets |  |  |  |
Reverse mortgage interests, net | 6,279.0 | 7,934.0 |  |
Financial liabilities |  |  |  |
Unsecured senior notes, net | 2,366.0 | 2,459.0 |  |
Fair Value, Nonrecurring | Participating interest financing |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 4,299.0 | 5,675.0 |  |
Fair Value, Nonrecurring | Trust 2019-2 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 331.0 |  |  |
Fair Value, Nonrecurring | Trust 2019-1 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 300.0 |  |  |
Fair Value, Nonrecurring | Trust 2018-3 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 208.0 | 326.0 |  |
Fair Value, Nonrecurring | Trust 2018-2 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 148.0 | 250.0 |  |
Fair Value, Nonrecurring | Trust 2018-1 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net |  | 284.0 |  |
Fair Value, Nonrecurring | Trust 2017-2 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net |  | 231.0 |  |
Fair Value, Nonrecurring | Nonrecourse debt - legacy assets |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net |  | 29.0 |  |
Fair Value, Nonrecurring | Level 1 |  |  |  |
Financial assets |  |  |  |
Reverse mortgage interests, net | 0.0 | 0.0 |  |
Financial liabilities |  |  |  |
Unsecured senior notes, net | 2,505.0 | 2,451.0 |  |
Fair Value, Nonrecurring | Level 1 | Participating interest financing |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 0.0 | 0.0 |  |
Fair Value, Nonrecurring | Level 1 | Trust 2019-2 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 0.0 |  |  |
Fair Value, Nonrecurring | Level 1 | Trust 2019-1 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 0.0 |  |  |
Fair Value, Nonrecurring | Level 1 | Trust 2018-3 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 0.0 | 0.0 |  |
Fair Value, Nonrecurring | Level 1 | Trust 2018-2 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 0.0 | 0.0 |  |
Fair Value, Nonrecurring | Level 1 | Trust 2018-1 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net |  | 0.0 |  |
Fair Value, Nonrecurring | Level 1 | Trust 2017-2 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net |  | 0.0 |  |
Fair Value, Nonrecurring | Level 1 | Nonrecourse debt - legacy assets |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net |  | 0.0 |  |
Fair Value, Nonrecurring | Level 2 |  |  |  |
Financial assets |  |  |  |
Reverse mortgage interests, net | 0.0 | 0.0 |  |
Financial liabilities |  |  |  |
Unsecured senior notes, net | 0.0 | 0.0 |  |
Fair Value, Nonrecurring | Level 2 | Participating interest financing |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 0.0 | 0.0 |  |
Fair Value, Nonrecurring | Level 2 | Trust 2019-2 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 0.0 |  |  |
Fair Value, Nonrecurring | Level 2 | Trust 2019-1 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 0.0 |  |  |
Fair Value, Nonrecurring | Level 2 | Trust 2018-3 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 0.0 | 0.0 |  |
Fair Value, Nonrecurring | Level 2 | Trust 2018-2 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 0.0 | 0.0 |  |
Fair Value, Nonrecurring | Level 2 | Trust 2018-1 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net |  | 0.0 |  |
Fair Value, Nonrecurring | Level 2 | Trust 2017-2 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net |  | 0.0 |  |
Fair Value, Nonrecurring | Level 2 | Nonrecourse debt - legacy assets |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net |  | 0.0 |  |
Fair Value, Nonrecurring | Level 3 |  |  |  |
Financial assets |  |  |  |
Reverse mortgage interests, net | 6,318.0 | 7,942.0 |  |
Financial liabilities |  |  |  |
Unsecured senior notes, net | 0.0 | 0.0 |  |
Fair Value, Nonrecurring | Level 3 | Participating interest financing |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 4,299.0 | 5,672.0 |  |
Fair Value, Nonrecurring | Level 3 | Trust 2019-2 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 331.0 |  |  |
Fair Value, Nonrecurring | Level 3 | Trust 2019-1 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 300.0 |  |  |
Fair Value, Nonrecurring | Level 3 | Trust 2018-3 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | 208.0 | 326.0 |  |
Fair Value, Nonrecurring | Level 3 | Trust 2018-2 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net | $ 148.0 | 249.0 |  |
Fair Value, Nonrecurring | Level 3 | Trust 2018-1 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net |  | 284.0 |  |
Fair Value, Nonrecurring | Level 3 | Trust 2017-2 |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net |  | 230.0 |  |
Fair Value, Nonrecurring | Level 3 | Nonrecourse debt - legacy assets |  |  |  |
Financial liabilities |  |  |  |
Other nonrecourse debt, net |  | $ 28.0 |  |

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