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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 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
ESS Financing Liability      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance $ 645.5 $ 931.7 $ 931.7
MSR transfers 7.0 4.4  
Changes in fair value due to inputs and assumptions 7.9 (38.3)  
Realization of expected cash flows (12.5) (14.5)  
Total fair value (gain) loss (4.7) (52.8)  
Ending balance (1) 647.9 883.2 645.5
MSR Asset Vehicle LLC      
Servicing Asset at Fair Value, Amount [Roll Forward]      
UPB of MSRs sold 18.0 8.0  
MSR Asset Vehicle LLC | ESS Financing Liability      
Servicing Asset at Fair Value, Amount [Roll Forward]      
MSR transfers 0.2 0.1  
Rithm Capital Corp | Fair Value Agency Mortgage Servicing Rights      
Servicing Asset at Fair Value, Amount [Roll Forward]      
UPB of MSRs sold     $ 33,400.0
Rithm Capital Corp | ESS Financing Liability      
Servicing Asset at Fair Value, Amount [Roll Forward]      
MSR transfers (0.1) 0.0  
Other MSR Capital Partners | ESS Financing Liability      
Servicing Asset at Fair Value, Amount [Roll Forward]      
MSR transfers $ 6.9 $ 4.3