v3.25.1
Borrowings - Schedule of Assets Held as Collateral Related to Secured Borrowings (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2025
Feb. 25, 2025
Dec. 31, 2024
Debt Instrument [Line Items]        
Cash and cash equivalents   $ 178.0   $ 184.8
Restricted cash (2)   58.9   80.8
Loans held for sale   1,402.2   1,290.2
Loans held for investment, at fair value   10,812.5   11,125.3
Unsecuritized loans   136.5   174.5
Mortgage servicing rights (MSRs), at fair value   2,547.4   2,466.3
Advances, net (5)   514.0   577.2
Receivables, net ($32.3 and $31.9 related to VIEs)   222.3   176.4
REO ($42.6 and $39.4 related to VIEs)   48.4   43.9
Total Assets   16,259.3   $ 16,435.4
Ginnie Mae Mortgage Servicing Rights Financing Facility | Secured Debt        
Debt Instrument [Line Items]        
Uncommitted available borrowing capacity     $ 300.0  
Asset Pledged as Collateral with Right | Ginnie Mae Mortgage Servicing Rights Financing Facility | Secured Debt        
Debt Instrument [Line Items]        
Proceeds from Lines of Credit $ 43.1      
Assets        
Debt Instrument [Line Items]        
Cash and cash equivalents   178.0    
Restricted cash (2)   58.9    
Loans held for sale   1,402.2    
Loans held for investment, at fair value   10,676.0    
Transferred MSRs, Including ESS   927.3    
Unsecuritized loans   136.5    
Mortgage servicing rights (MSRs), at fair value   1,620.1    
Advances, net (5)   514.0    
Receivables, net ($32.3 and $31.9 related to VIEs)   222.3    
REO ($42.6 and $39.4 related to VIEs)   48.4    
Total Assets   15,783.7    
Assets, Available Cash Held By Regulated Subsidiary Guarantors   147.3    
Pledged Assets        
Debt Instrument [Line Items]        
Cash and cash equivalents   0.0    
Restricted cash (2)   31.7    
Loans held for sale   1,381.2    
Loans held for investment, at fair value   10,676.0    
Transferred MSRs, Including ESS   927.3    
Unsecuritized loans   81.0    
Mortgage servicing rights (MSRs), at fair value   1,629.9    
Advances, net (5)   489.2    
Receivables, net ($32.3 and $31.9 related to VIEs)   161.3    
REO ($42.6 and $39.4 related to VIEs)   45.9    
Collateralized Financings (8)        
Debt Instrument [Line Items]        
Cash and cash equivalents   0.0    
Restricted cash (2)   0.0    
Loans held for sale   1,365.7    
Loans held for investment, at fair value   10,587.6    
Transferred MSRs, Including ESS   835.5    
Unsecuritized loans   72.2    
Mortgage servicing rights (MSRs), at fair value   1,092.8    
Advances, net (5)   420.6    
Receivables, net ($32.3 and $31.9 related to VIEs)   118.5    
REO ($42.6 and $39.4 related to VIEs)   50.8    
Total Assets   14,543.8    
Senior Lien | Asset Pledged as Collateral with Right        
Debt Instrument [Line Items]        
Total Assets   $ 15,423.4