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MSR Transfers Not Qualifying for Sale Accounting - Schedule of Activity Related to Financing Liability - MSRs Pledged (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Servicing Asset at Fair Value, Amount [Roll Forward]          
UPB of MSRs sold       $ 40.7 $ 11,100.0
Fair Value Agency Mortgage Servicing Rights          
Servicing Asset at Fair Value, Amount [Roll Forward]          
UPB of MSRs sold   $ 2,300.0 $ 2,900.0    
ESS Financing Liability          
Servicing Asset at Fair Value, Amount [Roll Forward]          
Beginning Balance $ 1,009.5   906.3 931.7 797.1
MSR transfers 81.7   11.9 179.5 81.6
Changes in fair value due to inputs and assumptions 45.5   91.1 88.2 188.3
Realization of expected cash flows (17.6)   (23.6) (47.8) (80.6)
Derecognition of financing liability 0.0   39.0 32.5 39.0
Calls 0.0   (0.1) 0.0 (0.6)
Total fair value (gain) loss 27.9   67.5 40.5 107.7
Ending Balance 1,119.1 1,009.5 946.6 1,119.1 946.6
Changes in fair value due to valuation inputs or assumptions         14.1
Rithm | Original Rights to Mortgage Servicing Rights Agreements          
Servicing Asset at Fair Value, Amount [Roll Forward]          
Ending Balance 698.6     698.6  
Rithm | ESS Financing Liability | Original Rights to Mortgage Servicing Rights Agreements          
Servicing Asset at Fair Value, Amount [Roll Forward]          
Beginning Balance 689.9   550.8 601.9 558.9
MSR transfers 0.9   0.0 98.5 0.0
Changes in fair value due to inputs and assumptions 16.3   71.1 19.8 102.6
Realization of expected cash flows (8.4)   (17.1) (21.6) (56.2)
Calls 0.0   (0.1) 0.0 (0.6)
Ending Balance 698.6 689.9 604.7 698.6 604.7
MSR Asset Vehicle LLC | ESS Financing Liability          
Servicing Asset at Fair Value, Amount [Roll Forward]          
Beginning Balance 319.7   355.5 329.8 238.1
MSR transfers 80.8   11.9 81.0 81.6
Changes in fair value due to inputs and assumptions 29.2   20.0 68.4 85.7
Realization of expected cash flows (9.2)   (6.5) (26.2) (24.4)
Derecognition of financing liability 0.0   39.0 32.5 39.0
Calls 0.0   0.0 0.0 0.0
Total fair value (gain) loss 20.0   13.6 42.2 61.3
Ending Balance 420.4 $ 319.7 342.0 420.4 342.0
Rithm Capital Corp . and others | ESS Financing Liability          
Servicing Asset at Fair Value, Amount [Roll Forward]          
Total fair value (gain) loss $ 7.9   $ 53.9 $ (1.7) $ 46.4