v3.26.1
Borrowings - Schedule of Assets Held as Collateral Related to Secured Borrowings (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Apr. 30, 2026
Jan. 31, 2026
Dec. 31, 2025
Debt Instrument [Line Items]        
Cash and cash equivalents $ 196.6     $ 180.5
Restricted cash 196.3     84.1
Mortgage servicing rights (MSRs), at fair value 3,208.8     2,825.3
Advances, net 369.5     483.4
Loans held for sale 3,601.9     1,891.7
Receivables, net ($80.2 and $64.2 related to VIEs) 233.9     189.8
REO ($162.8 and $81.0 related to VIEs) 165.4     83.8
Total Assets 12,350.3     16,170.6
Ginnie Mae Mortgage Servicing Rights Financing Facility | Secured Debt        
Debt Instrument [Line Items]        
Uncommitted available borrowing capacity 500.0 $ 500.0 $ 450.0 $ 400.0
Asset Pledged as Collateral with Right | Ginnie Mae Mortgage Servicing Rights Financing Facility | Secured Debt        
Debt Instrument [Line Items]        
Proceeds from Lines of Credit 36.3      
Assets        
Debt Instrument [Line Items]        
Cash and cash equivalents 196.6      
Restricted cash 196.3      
Mortgage servicing rights (MSRs), at fair value 2,377.5      
Transferred MSRs, Including ESS 831.3      
Advances, net 369.5      
Loans held for sale 3,601.9      
Loans held for investment, at fair value 3,627.1      
Unsecuritized loans 13.4      
Receivables, net ($80.2 and $64.2 related to VIEs) 233.9      
REO ($162.8 and $81.0 related to VIEs) 165.4      
Total Assets 11,612.9      
Assets, Available Cash Held By Regulated Subsidiary Guarantors 170.1      
Pledged Assets        
Debt Instrument [Line Items]        
Cash and cash equivalents 0.0      
Restricted cash 171.9      
Mortgage servicing rights (MSRs), at fair value 2,389.2      
Transferred MSRs, Including ESS 831.3      
Advances, net 339.1      
Loans held for sale 3,544.9      
Loans held for investment, at fair value 3,627.1      
Unsecuritized loans 4.8      
Receivables, net ($80.2 and $64.2 related to VIEs) 98.6      
REO ($162.8 and $81.0 related to VIEs) 162.8      
Collateralized Debt Obligations [Member]        
Debt Instrument [Line Items]        
Cash and cash equivalents 0.0      
Restricted cash 0.0      
Mortgage servicing rights (MSRs), at fair value 1,511.9      
Transferred MSRs, Including ESS 746.9      
Advances, net 291.0      
Loans held for sale 3,784.3      
Loans held for investment, at fair value 3,610.9      
Unsecuritized loans 4.1      
Receivables, net ($80.2 and $64.2 related to VIEs) 114.2      
REO ($162.8 and $81.0 related to VIEs) 200.5      
Total Assets 10,263.8      
Senior Lien | Collateralized Debt Obligations [Member]        
Debt Instrument [Line Items]        
Transferred MSRs, ESS Financing Liabilities 17.9      
Senior Lien | Asset Pledged as Collateral with Right        
Debt Instrument [Line Items]        
Total Assets $ 11,169.7