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Debt Warehouse Facilities (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity $ 59.5    
Warehouse facilities 1,006.5   $ 841.0
Payment for Origination, Loan, Mortgage, Held-for-Sale (8,691.7) $ (6,130.5)  
Proceeds from Sale and Collection, Loan, Held-for-Sale 8,524.7 4,741.5  
Net increase (decrease) in Warehouse facilities 165.5 $ 1,390.4  
Agreement expires September 15, 2025, Extension [Member]      
Line of Credit Facility [Line Items]      
Line of Credit, Current 194.7   341.3
Line of Credit Facility, Maximum Borrowing Capacity $ 700.0   700.0
Pricing on the Facility based on market rates SOFR plus 1.40%    
Agreement expires September 13, 2025, Extension [Member]      
Line of Credit Facility [Line Items]      
Line of Credit, Current $ 214.4   416.5
Line of Credit Facility, Maximum Borrowing Capacity $ 600.0   2,100.0
Pricing on the Facility based on market rates SOFR plus 1.30%    
Agreement expires October 23, 2025, Extension      
Line of Credit Facility [Line Items]      
Line of Credit, Current $ 507.4   8.8
Line of Credit Facility, Maximum Borrowing Capacity $ 1,100.0   400.0
Pricing on the Facility based on market rates SOFR plus 1.40%    
Fannie Mae ASAP program [Member]      
Line of Credit Facility [Line Items]      
Line of Credit, Current $ 91.1   75.3
Pricing on the Facility based on market rates SOFR plus 1.25%    
Line of Credit, Gross [Member]      
Line of Credit Facility [Line Items]      
Line of Credit, Current $ 1,007.6   841.9
Line of Credit Facility, Maximum Borrowing Capacity 2,400.0   3,200.0
Warehouse Agreement Borrowings [Member]      
Line of Credit Facility [Line Items]      
Unamortized Debt Issuance Expense $ 1.1   $ 0.9