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Other Financing Liabilities - Schedule of Financing Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
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