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Debt Warehouse Facilities (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 55.0  
Warehouse facilities 705.3 $ 795.7
Agreement expires September 19, 2022, Extension [Member] [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current 123.4 516.9
Line of Credit Facility, Maximum Borrowing Capacity $ 700.0 700.0
Pricing on the Facility based on market rates BSBY plus 1.30%  
Agreement expires September 16, 2022, Extension [Member] [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 404.2 74.7
Line of Credit Facility, Maximum Borrowing Capacity $ 1,200.0 1,200.0
Pricing on the Facility based on market rates LIBOR plus 1.30%  
Agreement expires August 27, 2022, Extension [Member] [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 136.8 192.8
Line of Credit Facility, Maximum Borrowing Capacity $ 300.0 300.0
Pricing on the Facility based on market rates LIBOR plus 1.30%  
Agreement expires July 30, 2022, Extension    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 0.0 0.0
Line of Credit Facility, Maximum Borrowing Capacity $ 400.0 400.0
Pricing on the Facility based on market rates LIBOR plus 1.60%  
Fannie Mae ASAP program [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 41.7 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 $ 706.1 796.9
Line of Credit Facility, Maximum Borrowing Capacity 2,600.0 2,600.0
Warehouse Agreement Borrowings [Member]    
Line of Credit Facility [Line Items]    
Unamortized Debt Issuance Expense $ 0.8 $ 1.2