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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
ESS Financing Liability        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance $ 647.9 $ 883.3 $ 645.5 $ 931.7
MSR transfers 5.8 93.4 12.7 97.8
Changes in fair value due to inputs and assumptions 32.5 81.0 40.3 42.7
Realization of expected cash flows (10.4) (15.6) (22.9) (30.1)
Total fair value (gain) loss 22.1 65.4 17.4 12.6
Ending balance (1) 590.0 1,009.5 590.0 1,009.5
Derecognition of financing liability (85.7) (32.5) (85.7) (32.5)
MSR Asset Vehicle LLC        
Servicing Asset at Fair Value, Amount [Roll Forward]        
UPB of MSRs sold     30.1 17.9
MSR Asset Vehicle LLC | ESS Financing Liability        
Servicing Asset at Fair Value, Amount [Roll Forward]        
MSR transfers 0.0 0.1 0.0 0.2
Derecognition of financing liability (85.7) (32.5) (85.7) (32.5)
Other MSR Capital Partners | ESS Financing Liability        
Servicing Asset at Fair Value, Amount [Roll Forward]        
MSR transfers 5.8 93.3 $ 12.7 $ 97.6
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 $ 2,300.0