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Debt Warehouse Facilities (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity $ 44.1    
Warehouse facilities 600.7   $ 841.0
Payment for Origination, Loan, Mortgage, Held-for-Sale (1,824.1) $ (1,587.3)  
Proceeds from Sale and Collection, Loan, Held-for-Sale 2,064.3 1,929.4  
Net increase (decrease) in Warehouse facilities (240.3) $ (340.5)  
Agreement expires September 15, 2025, Extension [Member]      
Line of Credit Facility [Line Items]      
Line of Credit, Current 85.2   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 $ 348.4   416.5
Line of Credit Facility, Maximum Borrowing Capacity $ 1,200.0   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 $ 167.7   8.8
Line of Credit Facility, Maximum Borrowing Capacity $ 400.0   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 $ 0.0   75.3
Line of Credit, Gross [Member]      
Line of Credit Facility [Line Items]      
Line of Credit, Current 601.3   841.9
Line of Credit Facility, Maximum Borrowing Capacity 2,300.0   3,200.0
Warehouse Agreement Borrowings [Member]      
Line of Credit Facility [Line Items]      
Unamortized Debt Issuance Expense $ 0.6   $ 0.9