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Debt Warehouse Facilities (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 54.8  
Warehouse facilities 813.6 $ 455.3
Agreement expires September 18, 2023, Extension [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current 254.4 215.7
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 15, 2023, Extension [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 503.1 132.3
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 28, 2023, Extension    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 0.0 9.0
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 $ 56.6 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 $ 814.1 456.2
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 $ 0.5 $ 0.9