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Other Financing Liabilities - Schedule of Financing Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |
Other financing liabilities, at fair value ($329.8 and $238.1 due to related party) ($6.7 and $7.9 related to VIEs) | $ 1,137.4 | $ 805.0 |
Ancillary and other settlement | 6.1 | (6.7) | $ (9.7)
Financing Liability Excess Servicing Spread |  |  |
Debt Instrument [Line Items] |  |  |
Other financing liabilities, at fair value ($329.8 and $238.1 due to related party) ($6.7 and $7.9 related to VIEs) | 199.0 | 0.0 |
MAV Asset Vehicle LLC |  |  |
Debt Instrument [Line Items] |  |  |
Ancillary and other settlement | 0.4 | 4.4 |
NRZ |  |  |
Debt Instrument [Line Items] |  |  |
Ancillary and other settlement |  | (11.1) |
Financing Liabilities | Other counterparties for Pledged MSR liab. |  |  |
Debt Instrument [Line Items] |  |  |
Other financing liabilities, at fair value ($329.8 and $238.1 due to related party) ($6.7 and $7.9 related to VIEs) | 0.7 | 0.0 |
Financing Liability - MSRs Pledged |  |  |
Debt Instrument [Line Items] |  |  |
Other financing liabilities, at fair value ($329.8 and $238.1 due to related party) ($6.7 and $7.9 related to VIEs) | 931.7 | 797.1 |
Residential Asset Securitization Trust 2003-A11 (RAST 2003-A11) | Financing Liabilities |  |  |
Debt Instrument [Line Items] |  |  |
Other financing liabilities, at fair value ($329.8 and $238.1 due to related party) ($6.7 and $7.9 related to VIEs) | 6.7 | 7.9 |
Original Rights to MSRs Agreements | Financing Liabilities | NRZ |  |  |
Debt Instrument [Line Items] |  |  |
Other financing liabilities, at fair value ($329.8 and $238.1 due to related party) ($6.7 and $7.9 related to VIEs) | 601.2 | 558.9 |
MAV MSR Sale Agreements | Financing Liabilities | MAV Asset Vehicle LLC |  |  |
Debt Instrument [Line Items] |  |  |
Other financing liabilities, at fair value ($329.8 and $238.1 due to related party) ($6.7 and $7.9 related to VIEs) | $ 329.8 | $ 238.1 |

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