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Debt Warehouse Facilities (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]    
Document Period End Date Sep. 30, 2019  
Line of Credit Facility, Maximum Borrowing Capacity $ 70.0  
Warehouse facilities 786.4 $ 317.9
Warehouse Agreement Borrowings [Member]    
Line of Credit Facility [Line Items]    
Unamortized Debt Issuance Expense 1.2 1.2
Agreement expires September 21, 2020, Extension [Member] [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current 156.6  
Line of Credit Facility, Maximum Borrowing Capacity $ 375.0  
Pricing on the Facility based on market rates LIBOR plus 1.15%  
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
Huntington Agreement- HFF, Extension [Member] [Member] [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 28.3 0.0
Line of Credit Facility, Maximum Borrowing Capacity $ 175.0 0.0
Pricing on the Facility based on market rates LIBOR plus 1.25%  
PNC Agreement- HFF, Extension [Member] [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 140.6 0.0
Line of Credit Facility, Maximum Borrowing Capacity $ 1,000.0 0.0
Pricing on the Facility based on market rates LIBOR plus 1.25%  
Agreement expires September 19, 2020, Extension [Member] [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 323.7  
Line of Credit Facility, Maximum Borrowing Capacity $ 775.0  
Pricing on the Facility based on market rates LIBOR plus 1.15%  
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, 2020, Extension [Member] [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 0.0  
Line of Credit Facility, Maximum Borrowing Capacity $ 100.0  
Pricing on the Facility based on market rates LIBOR plus 1.15%  
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
Fannie Mae ASAP program [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument, Repurchase Amount $ 138.4 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 $ 787.6 319.1
Line of Credit Facility, Maximum Borrowing Capacity $ 2,425.0 $ 1,250.0