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Mortgage Servicing - Schedule of Composition of Servicing UPB (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Servicing Assets at Fair Value [Line Items]            
MSRs, at fair value $ 2,859.8 $ 2,675.7 $ 2,665.2 $ 2,714.2 $ 2,485.7 $ 2,250.1
Assets serviced 201,100.0   199,600.0 198,000.0    
UPB of loans transferred 45,093.6   37,571.1      
Owned MSRs            
Servicing Assets at Fair Value [Line Items]            
MSRs, at fair value 1,717.6   1,710.6 1,743.0    
Assets serviced 119,400.0   126,200.0 123,400.0    
Rithm Transferred Mortgage Servicing Rights            
Servicing Assets at Fair Value [Line Items]            
MSRs, at fair value 709.1   601.2 604.7    
Assets serviced 52,400.0   47,300.0 48,400.0    
MAV Transferred MSRs            
Servicing Assets at Fair Value [Line Items]            
MSRs, at fair value 433.1   353.4 366.6    
Assets serviced 29,200.0   $ 26,100.0 $ 26,200.0    
Mortgage Servicing Rights Title Retained | Rithm Transferred Mortgage Servicing Rights            
Servicing Assets at Fair Value [Line Items]            
UPB of loans transferred $ 10,100.0