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Regulatory Requirements - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Public Utilities, General Disclosures [Line Items]      
Net worth requirement $ 359.4    
Cash and cash equivalents 213.4 $ 208.0  
Assets serviced $ 197,400.0 199,600.0 $ 194,500.0
Percentage of portfolio to total forward owned servicing 7.00%    
Percentage of government-insured loans UPB to total UPB serviced and sub-serviced 5.00%    
Owned MSRs      
Public Utilities, General Disclosures [Line Items]      
Assets serviced $ 121,100.0 $ 126,200.0 $ 116,300.0
Owned MSRs | Unpaid Principal Balance      
Public Utilities, General Disclosures [Line Items]      
Assets serviced 14,400.0    
CA DFPI      
Public Utilities, General Disclosures [Line Items]      
Litigation Settlement, Amount Awarded to Other Party 2.5    
PHH Mortgage Corporation      
Public Utilities, General Disclosures [Line Items]      
Net worth 565.3    
Restrictive liquidity requirements 40.0    
Cash and cash equivalents $ 190.0