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Debt Warehouse Facilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Line of Credit Facility [Line Items]    
Document Period End Date Dec. 31, 2024  
Line of Credit Facility, Maximum Borrowing Capacity $ 42.5  
Unamortized Debt Issuance Expense 0.7 $ 0.0
Warehouse facilities 841.0 662.7
Warehouse Agreement Borrowings [Member]    
Line of Credit Facility [Line Items]    
Unamortized Debt Issuance Expense $ 0.9 $ 1.0
Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Interest Rate During Period 5.90% 5.90%
Line of Credit Facility, Average Outstanding Amount $ 1,381.4 $ 1,875.9
Pricing on the Facility based on market rates ("SOFR") plus 0.875% to 1.35%  
Line of Credit Facility, Maximum Borrowing Capacity $ 3,300.0  
Unamortized Debt Issuance Expense $ 11.4 14.4
Agreement expires September 18, 2023, Extension [Member]    
Line of Credit Facility [Line Items]    
Pricing on the Facility based on market rates SOFR plus 1.40%  
Line of Credit, Current $ 341.3 159.0
Line of Credit Facility, Maximum Borrowing Capacity $ 700.0 700.0
Agreement expires September 15, 2023, Extension [Member]    
Line of Credit Facility [Line Items]    
Pricing on the Facility based on market rates SOFR plus 1.30%  
Line of Credit, Current $ 416.5 405.1
Line of Credit Facility, Maximum Borrowing Capacity $ 2,100.0 1,200.0
Agreement expires July 28, 2023, Extension    
Line of Credit Facility [Line Items]    
Pricing on the Facility based on market rates SOFR plus 1.40%  
Line of Credit, Current $ 8.8 62.3
Line of Credit Facility, Maximum Borrowing Capacity 400.0 400.0
Fannie Mae ASAP program [Member]    
Line of Credit Facility [Line Items]    
Fannie Mae ASAP Program, Outstanding Balance 75.3 37.3
Line of Credit, Gross [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current 841.9 663.7
Line of Credit Facility, Maximum Borrowing Capacity $ 3,200.0 $ 2,300.0