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Debt Warehouse Facilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Line of Credit Facility [Line Items]    
Document Period End Date Dec. 31, 2021  
Line of Credit Facility, Maximum Borrowing Capacity $ 55.5  
Warehouse Agreement Borrowings [Member]    
Line of Credit Facility [Line Items]    
Unamortized Debt Issuance Expense $ 1.2 $ 1.2
Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Interest Rate During Period 0.90% 1.60%
Line of Credit Facility, Average Outstanding Amount $ 432.0 $ 865.1
Pricing on the Facility based on market rates LIBOR plus 0.875% to 1.35%  
Line of Credit Facility, Maximum Borrowing Capacity $ 2,750.0  
Unamortized Debt Issuance Expense $ 11.8 8.7
Agreement expires September 19, 2022, Extension [Member]    
Line of Credit Facility [Line Items]    
Pricing on the Facility based on market rates BSBY plus 1.30%  
Line of Credit, Current $ 516.9 144.4
Line of Credit Facility, Maximum Borrowing Capacity $ 700.0 400.0
Agreement expires September 16, 2022, Extension [Member]    
Line of Credit Facility [Line Items]    
Pricing on the Facility based on market rates LIBOR plus 1.30%  
Line of Credit, Current $ 74.7 768.9
Line of Credit Facility, Maximum Borrowing Capacity $ 1,200.0 1,600.0
Agreement expires August 27, 2022 [Member]    
Line of Credit Facility [Line Items]    
Pricing on the Facility based on market rates LIBOR plus 1.30%  
Line of Credit, Current $ 192.8 195.9
Line of Credit Facility, Maximum Borrowing Capacity $ 300.0 900.0
Agreement expires July 30, 2022, Extension    
Line of Credit Facility [Line Items]    
Pricing on the Facility based on market rates LIBOR plus 1.60%  
Line of Credit, Current $ 0.0 0.0
Line of Credit Facility, Maximum Borrowing Capacity 400.0  
Fannie Mae ASAP program [Member]    
Line of Credit Facility [Line Items]    
Fannie Mae ASAP Program, Outstanding Balance $ 12.5 128.8
Debt Instrument, Interest Rate Terms SOFR plus 1.25%  
PNC Agreement- HFF, Extension [Member] [Member]    
Line of Credit Facility [Line Items]    
Pricing on the Facility based on market rates LIBOR plus 1.50%  
Line of Credit, Current $ 0.0 261.6
Line of Credit Facility, Maximum Borrowing Capacity 0.0 300.0
Line of Credit, Gross [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current 796.9 1,499.6
Line of Credit Facility, Maximum Borrowing Capacity $ 2,600.0 $ 3,200.0