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Debt Warehouse Facilities (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Line of Credit Facility [Line Items]    
Document Period End Date Mar. 31, 2021  
Line of Credit Facility, Maximum Borrowing Capacity $ 63.4  
Warehouse facilities 833.5 $ 1,498.4
Fannie Mae ASAP program [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 58.9 128.8
Debt Instrument, Interest Rate Terms LIBOR plus 1.15%  
Agreement expires September 20, 2021, Extension [Member] [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 171.5 144.4
Line of Credit Facility, Maximum Borrowing Capacity $ 400.0 400.0
Pricing on the Facility based on market rates LIBOR plus 1.40%  
Agreement expires September 18, 2021, Extension [Member] [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 516.6 768.9
Line of Credit Facility, Maximum Borrowing Capacity $ 1,200.0 1,600.0
Pricing on the Facility based on market rates LIBOR plus 1.40%  
Agreement expires August 27, 2021, Extension [Member] [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 87.3 195.9
Line of Credit Facility, Maximum Borrowing Capacity $ 200.0 900.0
Pricing on the Facility based on market rates LIBOR plus 1.40%  
PNC Agreement- HFF, Extension [Member] [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 0.0 261.6
Line of Credit Facility, Maximum Borrowing Capacity $ 300.0 300.0
Pricing on the Facility based on market rates LIBOR plus 1.50%  
Line of Credit, Gross [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 834.3 1,499.6
Line of Credit Facility, Maximum Borrowing Capacity 2,100.0 3,200.0
Warehouse Agreement Borrowings [Member]    
Line of Credit Facility [Line Items]    
Unamortized Debt Issuance Expense $ 0.8 $ 1.2