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Debt Warehouse Facilities (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 53.8  
Warehouse facilities 655.5 $ 662.7
Agreement expires September 16, 2024, Extension [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current 174.8 159.0
Line of Credit Facility, Maximum Borrowing Capacity $ 700.0 700.0
Pricing on the Facility based on market rates BSBY(1) plus 1.30%  
Agreement expires September 14, 2024, Extension [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 416.3 405.1
Line of Credit Facility, Maximum Borrowing Capacity $ 1,200.0 1,200.0
Pricing on the Facility based on market rates SOFR plus 1.30%  
Agreement expires July 26, 2024, Extension    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 58.7 62.3
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 $ 6.0 37.3
Line of Credit, Gross [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current 655.8 663.7
Line of Credit Facility, Maximum Borrowing Capacity 2,300.0 2,300.0
Warehouse Agreement Borrowings [Member]    
Line of Credit Facility [Line Items]    
Unamortized Debt Issuance Expense $ 0.3 $ 1.0