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Debt Warehouse Facilities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Line of Credit Facility [Line Items]      
Document Period End Date   Sep. 30, 2021  
Line of Credit Facility, Maximum Borrowing Capacity $ 57.0 $ 57.0  
Warehouse facilities 2,266.3 2,266.3 $ 1,498.4
Agreement expires November 15, 2021, Extension [Member] [Member]      
Line of Credit Facility [Line Items]      
Line of Credit, Current 414.4 414.4 144.4
Line of Credit Facility, Maximum Borrowing Capacity 700.0 $ 700.0 400.0
Pricing on the Facility based on market rates   LIBOR plus 1.30%  
Agreement expires September 16, 2022, Extension [Member] [Member]      
Line of Credit Facility [Line Items]      
Line of Credit, Current 1,658.3 $ 1,658.3 768.9
Line of Credit Facility, Maximum Borrowing Capacity 2,000.0 $ 2,000.0 1,600.0
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 194.8 $ 194.8 195.9
Line of Credit Facility, Maximum Borrowing Capacity 300.0 $ 300.0 900.0
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 0.0
Line of Credit Facility, Maximum Borrowing Capacity $ 400.0 400.0 0.0
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 $ 0.0 $ 0.0 128.8
Debt Instrument, Interest Rate Terms   SOFR plus 1.25%  
PNC Agreement- HFF, Extension [Member] [Member]      
Line of Credit Facility [Line Items]      
Line of Credit, Current 0.0 $ 0.0 261.6
Line of Credit Facility, Maximum Borrowing Capacity 0.0 $ 0.0 300.0
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 2,267.5 $ 2,267.5 1,499.6
Line of Credit Facility, Maximum Borrowing Capacity 3,400.0 3,400.0 3,200.0
Warehouse Agreement Borrowings [Member]      
Line of Credit Facility [Line Items]      
Unamortized Debt Issuance Expense $ 1.2 $ 1.2 $ 1.2