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Debt Warehouse Facilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Line of Credit Facility [Line Items]    
Document Period End Date Dec. 31, 2023  
Line of Credit Facility, Maximum Borrowing Capacity $ 55.2  
Warehouse facilities 662.7 $ 455.3
Warehouse Agreement Borrowings [Member]    
Line of Credit Facility [Line Items]    
Unamortized Debt Issuance Expense $ 1.0 $ 0.9
Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Interest Rate During Period 5.90% 2.90%
Line of Credit Facility, Average Outstanding Amount $ 1,875.9 $ 1,399.1
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 $ 14.4 11.2
Agreement expires September 18, 2023, Extension [Member]    
Line of Credit Facility [Line Items]    
Pricing on the Facility based on market rates BSBY(1) plus 1.30%  
Line of Credit, Current $ 159.0 215.7
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 $ 405.1 132.3
Line of Credit Facility, Maximum Borrowing Capacity $ 1,200.0 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 $ 62.3 9.0
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 $ 37.3 99.2
Debt Instrument, Interest Rate Terms SOFR plus 1.25%  
Line of Credit, Gross [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 663.7 456.2
Line of Credit Facility, Maximum Borrowing Capacity $ 2,300.0 $ 2,300.0