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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
ESS Financing Liability        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance $ 590.0 $ 1,009.5 $ 645.5 $ 931.7
MSR transfers 5.0 81.7 17.7 179.5
Changes in fair value due to inputs and assumptions (7.1) 45.5 33.3 88.2
Realization of expected cash flows (10.2) (17.6) (33.1) (47.8)
Total fair value (gain) loss (17.2) 27.9 0.2 40.5
Ending balance (1) 577.7 1,119.1 577.7 1,119.1
Derecognition of financing liability (0.1) 0.0 (85.7) (32.5)
MSR Asset Vehicle LLC | ESS Financing Liability        
Servicing Asset at Fair Value, Amount [Roll Forward]        
MSR transfers 0.0 80.8 0.0 81.0
Other MSR Capital Partners | ESS Financing Liability        
Servicing Asset at Fair Value, Amount [Roll Forward]        
MSR transfers $ 5.0 0.9 17.7 98.5
MAV Asset Vehicle LLC | Fair Value Agency Mortgage Servicing Rights        
Servicing Asset at Fair Value, Amount [Roll Forward]        
UPB of MSRs sold   $ 2,300.0 $ 5,500.0 $ 2,300.0