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Debt Warehouse Facilities (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 850.0 $ 850.0
Warehouse facilities 406.4 309.2
Warehouse Agreement Borrowings [Member]    
Line of Credit Facility [Line Items]    
Unamortized Debt Issuance Expense 0.8 1.2
Agreement expires September 24, 2018 [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current 231.2 156.4
Line of Credit Facility, Maximum Borrowing Capacity $ 375.0 375.0
Pricing on the Facility based on market rates LIBOR plus 1.4%  
Agreement expires September 29, 2018 [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 80.5 74.8
Line of Credit Facility, Maximum Borrowing Capacity $ 375.0 375.0
Pricing on the Facility based on market rates LIBOR plus 1.35%  
Agreement expires August 31, 2018 [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 0.0 0.0
Line of Credit Facility, Maximum Borrowing Capacity $ 100.0 100.0
Pricing on the Facility based on market rates LIBOR plus 1.5%  
Fannie Mae ASAP program [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument, Repurchase Amount $ 95.5 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 $ 407.2 $ 310.4