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Debt Warehouse Facilities (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 61.5  
Warehouse facilities 611.9 $ 309.2
Warehouse Agreement Borrowings [Member]    
Line of Credit Facility [Line Items]    
Unamortized Debt Issuance Expense 1.6 1.2
Agreement expires September 20, 2019, Original Max Capacity [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 375.0  
Agreement expires September 24, 2018 [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current 292.5 156.4
Line of Credit Facility, Maximum Borrowing Capacity $ 375.0 375.0
Pricing on the Facility based on market rates LIBOR plus 1.3%  
Agreement expires September 29, 2018 [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 226.3 74.8
Line of Credit Facility, Maximum Borrowing Capacity $ 775.0 375.0
Pricing on the Facility based on market rates LIBOR plus 1.25%  
Agreement expires August 31, 2018 [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 54.0 0.0
Line of Credit Facility, Maximum Borrowing Capacity $ 100.0 100.0
Pricing on the Facility based on market rates LIBOR plus 1.3%  
Fannie Mae ASAP program [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument, Repurchase Amount $ 40.7 79.2
Debt Instrument, Interest Rate Terms LIBOR plus 1.30% to 1.45%  
Line of Credit, Gross [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 613.5 310.4
Line of Credit Facility, Maximum Borrowing Capacity $ 1,250.0 $ 850.0