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Debt Warehouse Facilities (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2022
Dec. 31, 2021
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity $ 50.1 $ 50.1  
Warehouse facilities 685.0 685.0 $ 795.7
Agreement expires September 18, 2023, Extension [Member]      
Line of Credit Facility [Line Items]      
Line of Credit, Current 172.4 172.4 516.9
Line of Credit Facility, Maximum Borrowing Capacity 700.0 $ 700.0 700.0
Pricing on the Facility based on market rates   BSBY plus 1.30%  
Agreement expires September 15, 2023, Extension [Member]      
Line of Credit Facility [Line Items]      
Line of Credit, Current 442.2 $ 442.2 74.7
Line of Credit Facility, Maximum Borrowing Capacity 1,200.0 $ 1,200.0 1,200.0
Pricing on the Facility based on market rates   SOFR plus 1.30%  
Agreement expires August 27, 2022, Extension [Member]      
Line of Credit Facility [Line Items]      
Line of Credit, Current 0.0 $ 0.0 192.8
Line of Credit Facility, Maximum Borrowing Capacity 0.0 $ 0.0 300.0
Pricing on the Facility based on market rates   LIBOR plus 1.30%  
Agreement expires July 28, 2023, Extension      
Line of Credit Facility [Line Items]      
Line of Credit, Current 0.0 $ 0.0 0.0
Line of Credit Facility, Maximum Borrowing Capacity $ 400.0 400.0 400.0
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 $ 71.6 $ 71.6 12.5
Debt Instrument, Interest Rate Terms   SOFR plus 1.25%  
Line of Credit, Gross [Member]      
Line of Credit Facility [Line Items]      
Line of Credit, Current 686.2 $ 686.2 796.9
Line of Credit Facility, Maximum Borrowing Capacity 2,300.0 2,300.0 2,600.0
Warehouse Agreement Borrowings [Member]      
Line of Credit Facility [Line Items]      
Unamortized Debt Issuance Expense $ 1.2 $ 1.2 $ 1.2