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Investment in Equity Method Investee and Related Party Transactions (Narrative) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Schedule of Equity Method Investments [Line Items]    
UPB of MSRs sold $ 31.3 $ 11,100.0
MSR Asset Vehicle LLC    
Schedule of Equity Method Investments [Line Items]    
Unpaid principal balance of loans subserviced 46,600.0  
MSR Asset Vehicle LLC | Mortgage Servicing Rights Title Transferred    
Schedule of Equity Method Investments [Line Items]    
UPB of rights to MSRs sold 22,900.0  
Joint Marketing and Recapture Agreement    
Schedule of Equity Method Investments [Line Items]    
UPB of MSRs sold 17.9 191.4
Other MSR Purchase and Sale Agreement    
Schedule of Equity Method Investments [Line Items]    
UPB of MSRs sold $ 0.0 $ 5,700.0