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Investment in Equity Method Investee and Related Party Transactions (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Schedule of Equity Method Investments [Line Items]    
UPB of MSRs sold $ 15.8 $ 11,100.0
MSR Asset Vehicle LLC    
Schedule of Equity Method Investments [Line Items]    
Unpaid principal balance of loans subserviced 51,800.0  
MSR Asset Vehicle LLC | Mortgage Servicing Rights Title Transferred    
Schedule of Equity Method Investments [Line Items]    
UPB of rights to MSRs sold 25,700.0  
Joint Marketing and Recapture Agreement    
Schedule of Equity Method Investments [Line Items]    
UPB of MSRs sold 8.0 90.3
Other MSR Purchase and Sale Agreement    
Schedule of Equity Method Investments [Line Items]    
UPB of MSRs sold $ 0.0 $ 3,400.0