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Debt Warehouse Facilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]    
Document Period End Date Dec. 31, 2019  
Line of Credit Facility, Maximum Borrowing Capacity $ 87.1  
Warehouse Agreement Borrowings [Member]    
Line of Credit Facility [Line Items]    
Unamortized Debt Issuance Expense $ 0.9 $ 1.2
Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Interest Rate During Period 3.00% 2.90%
Line of Credit Facility, Average Outstanding Amount $ 851.6 $ 364.1
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 $ 12.3 15.9
Agreement expires September 23, 2019, Extension [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current   217.3
Line of Credit Facility, Maximum Borrowing Capacity   375.0
Agreement expires September 21, 2020, Extension [Member] [Member] [Member]    
Line of Credit Facility [Line Items]    
Pricing on the Facility based on market rates LIBOR plus 1.15%  
Line of Credit, Current $ 104.4  
Line of Credit Facility, Maximum Borrowing Capacity $ 375.0  
Agreement expires September 19, 2020, Extension [Member]    
Line of Credit Facility [Line Items]    
Pricing on the Facility based on market rates LIBOR plus 1.15%  
Line of Credit, Current $ 184.8  
Line of Credit Facility, Maximum Borrowing Capacity $ 775.0  
Agreement expires August 31, 2020 [Member]    
Line of Credit Facility [Line Items]    
Pricing on the Facility based on market rates LIBOR plus 1.15%  
Line of Credit, Current $ 11.4  
Line of Credit Facility, Maximum Borrowing Capacity 100.0  
Fannie Mae ASAP program [Member]    
Line of Credit Facility [Line Items]    
Fannie Mae ASAP Program, Outstanding Balance $ 53.6 18.9
Debt Instrument, Interest Rate Terms LIBOR plus 1.15%  
Line of Credit, Gross [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 516.8 319.1
Line of Credit Facility, Maximum Borrowing Capacity $ 2,425.0 1,250.0
Agreement expires September 20, 2019, Extension [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current   82.9
Line of Credit Facility, Maximum Borrowing Capacity   775.0
Agreement expires August 31, 2019, Extension [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current   0.0
Line of Credit Facility, Maximum Borrowing Capacity   100.0
PNC Agreement- HFF, Extension [Member] [Member]    
Line of Credit Facility [Line Items]    
Pricing on the Facility based on market rates LIBOR plus 1.25%  
Line of Credit, Current $ 151.6 0.0
Line of Credit Facility, Maximum Borrowing Capacity $ 1,000.0 0.0
Huntington Agreement- HFF, Extension [Member] [Member] [Member]    
Line of Credit Facility [Line Items]    
Pricing on the Facility based on market rates LIBOR plus 1.25%  
Line of Credit, Current $ 11.0 0.0
Line of Credit Facility, Maximum Borrowing Capacity $ 175.0 $ 0.0