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Borrowings - Schedule of Assets Held as Collateral Related to Secured Borrowings (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Jun. 29, 2025
Dec. 31, 2024
Debt Instrument [Line Items]      
Cash and cash equivalents $ 172.8   $ 184.8
Restricted cash 98.4   80.8
Loans held for sale 1,915.6   1,290.2
Loans held for investment, at fair value 10,117.4   11,125.3
Unsecuritized loans 100.1   174.5
Mortgage servicing rights (MSRs), at fair value 2,762.9   2,466.3
Advances, net 435.1   577.2
Receivables, net ($37.6 and $31.9 related to VIEs) 167.4   176.4
REO ($58.3 and $39.4 related to VIEs) 64.4   43.9
Total Assets 16,107.4   $ 16,435.4
Ginnie Mae Mortgage Servicing Rights Financing Facility | Secured Debt      
Debt Instrument [Line Items]      
Uncommitted available borrowing capacity 400.0 $ 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 30.5    
Assets      
Debt Instrument [Line Items]      
Cash and cash equivalents 172.8    
Restricted cash 98.4    
Loans held for sale 1,915.6    
Loans held for investment, at fair value 10,017.3    
Transferred MSRs, Including ESS 909.7    
Unsecuritized loans 100.1    
Mortgage servicing rights (MSRs), at fair value 1,853.2    
Advances, net 435.1    
Receivables, net ($37.6 and $31.9 related to VIEs) 167.4    
REO ($58.3 and $39.4 related to VIEs) 64.4    
Total Assets 15,734.3    
Assets, Available Cash Held By Regulated Subsidiary Guarantors 154.2    
Pledged Assets      
Debt Instrument [Line Items]      
Cash and cash equivalents 0.0    
Restricted cash 37.6    
Loans held for sale 1,874.0    
Loans held for investment, at fair value 10,017.3    
Transferred MSRs, Including ESS 909.7    
Unsecuritized loans 74.8    
Mortgage servicing rights (MSRs), at fair value 1,858.0    
Advances, net 401.2    
Receivables, net ($37.6 and $31.9 related to VIEs) 65.5    
REO ($58.3 and $39.4 related to VIEs) 59.0    
Collateralized Financings (8)      
Debt Instrument [Line Items]      
Cash and cash equivalents 0.0    
Restricted cash 0.0    
Loans held for sale 1,886.0    
Loans held for investment, at fair value 9,924.6    
Transferred MSRs, Including ESS 822.0    
Unsecuritized loans 66.0    
Mortgage servicing rights (MSRs), at fair value 1,192.8    
Advances, net 351.0    
Receivables, net ($37.6 and $31.9 related to VIEs) 76.5    
REO ($58.3 and $39.4 related to VIEs) 68.0    
Total Assets 14,386.8    
Senior Lien | Asset Pledged as Collateral with Right      
Debt Instrument [Line Items]      
Total Assets $ 15,297.2