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Other Financing Liabilities, at Fair Value - Schedule of Activity Related to Financing Liability - MSRs Pledged (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Servicing Asset at Fair Value, Amount [Roll Forward]        
MSR transfers $ 0.0   $ 0.3  
Financing Liability Mortgage Servicing Rights Pledged [Member]        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance 818.1 $ 840.5 846.9 $ 894.4
MSR transfers 7.9 5.0 22.1 17.7
Derecognition of financing liability 0.0 (0.1) (12.2) (85.7)
Changes in fair value due to inputs and assumptions 1.2 (7.4) 5.3 49.0
Realization of expected cash flows (18.0) (17.0) (52.8) (54.3)
Total fair value (gain) loss (16.8) (24.4) (47.5) (5.3)
Ending balance 822.0 821.0 822.0 821.0
Financing Liability Excess Servicing Spread [Member]        
Servicing Asset at Fair Value, Amount [Roll Forward]        
ESS issuances 12.7 0.0 12.7 0.0
MSR Asset Vehicle LLC | Financing Liability Mortgage Servicing Rights Pledged [Member]        
Servicing Asset at Fair Value, Amount [Roll Forward]        
MSR transfers 0.2 0.0 0.2 0.0
Derecognition of financing liability 0.0 0.0 0.0 (85.7)
Rithm Capital Corp | Financing Liability Mortgage Servicing Rights Pledged [Member]        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Derecognition of financing liability 0.0 (0.1) 0.0 (0.1)
Other MSR Capital Partners | Financing Liability Mortgage Servicing Rights Pledged [Member]        
Servicing Asset at Fair Value, Amount [Roll Forward]        
MSR transfers 7.8 5.0 21.9 17.7
Derecognition of financing liability $ 0.0 $ 0.0 $ (12.1) 0.0
MAV Asset Vehicle LLC | Fair Value Agency Mortgage Servicing Rights        
Servicing Asset at Fair Value, Amount [Roll Forward]        
UPB of MSRs sold       $ 5,500.0