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Mortgage Servicing - Schedule of Composition of Servicing UPB (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Servicing Assets at Fair Value [Line Items]            
MSRs, at fair value $ 2,675.7 $ 2,580.6 $ 2,665.2 $ 2,485.7 $ 2,323.3 $ 2,250.1
Assets serviced 197,400.0   199,600.0 194,500.0    
UPB of loans transferred 40,875.0   37,571.1      
Owned MSRs            
Servicing Assets at Fair Value [Line Items]            
MSRs, at fair value 1,643.7   1,710.6 1,552.6    
Assets serviced 121,100.0   126,200.0 116,300.0    
Rithm Transferred Mortgage Servicing Rights            
Servicing Assets at Fair Value [Line Items]            
MSRs, at fair value 702.0   601.2 550.8    
Assets serviced 53,400.0   47,300.0 49,700.0    
MAV Transferred MSRs            
Servicing Assets at Fair Value [Line Items]            
MSRs, at fair value 330.0   353.4 382.2    
Assets serviced 22,900.0   $ 26,100.0 $ 28,500.0    
Mortgage Servicing Rights Title Retained | Rithm Transferred Mortgage Servicing Rights            
Servicing Assets at Fair Value [Line Items]            
UPB of loans transferred $ 10,300.0