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Mortgage Servicing - Schedule of Composition of Servicing UPB (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Servicing Assets at Fair Value [Line Items]        
MSRs, at fair value $ 2,374.7 $ 2,272.2 $ 2,580.6 $ 2,665.2
Assets serviced 171,300.0 169,700.0    
UPB of loans transferred 48,788.7 46,810.1    
Owned MSRs        
Servicing Assets at Fair Value [Line Items]        
MSRs, at fair value 1,707.3 1,604.6    
Assets serviced 124,500.0 122,700.0    
MAV Transferred MSRs        
Servicing Assets at Fair Value [Line Items]        
MSRs, at fair value 413.6 422.8    
Assets serviced 28,400.0 $ 28,800.0    
Mortgage Servicing Rights Title Retained | Rithm Transferred Mortgage Servicing Rights        
Servicing Assets at Fair Value [Line Items]        
UPB of loans transferred $ 9,700.0