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Debt Warehouse Facilities (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 55.5  
Warehouse facilities 2,053.1 $ 662.7
Agreement expires September 15, 2025, Extension [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current 566.8  
Line of Credit Facility, Maximum Borrowing Capacity $ 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 $ 1,152.6  
Line of Credit Facility, Maximum Borrowing Capacity $ 1,700.0  
Pricing on the Facility based on market rates SOFR plus 1.30%  
Agreement expires October 24, 2024, Extension    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 195.8  
Line of Credit Facility, Maximum Borrowing Capacity $ 400.0  
Pricing on the Facility based on market rates SOFR plus 1.40%  
Agreement expires September 14, 2024, Extension    
Line of Credit Facility [Line Items]    
Line of Credit, Current   159.0
Line of Credit Facility, Maximum Borrowing Capacity   700.0
Agreement expires September 14, 2024, Extension    
Line of Credit Facility [Line Items]    
Line of Credit, Current   405.1
Line of Credit Facility, Maximum Borrowing Capacity   1,200.0
Agreement expires July 26, 2024, Extension    
Line of Credit Facility [Line Items]    
Line of Credit, Current   62.3
Line of Credit Facility, Maximum Borrowing Capacity   400.0
Fannie Mae ASAP program [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 138.5 37.3
Line of Credit, Gross [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current 2,053.7 663.7
Line of Credit Facility, Maximum Borrowing Capacity 2,800.0 2,300.0
Warehouse Agreement Borrowings [Member]    
Line of Credit Facility [Line Items]    
Unamortized Debt Issuance Expense $ 0.6 $ 1.0