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Debt Warehouse Facilities (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 775.0 $ 1,025.0
Warehouse facilities 237.3 580.1
Warehouse Agreement Borrowings [Member]    
Line of Credit Facility [Line Items]    
Unamortized Debt Issuance Expense 0.7 0.9
Agreement expires September 25, 2017 [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current 125.8 135.2
Line of Credit Facility, Maximum Borrowing Capacity $ 275.0 275.0
Pricing on the Facility based on market rates LIBOR plus 1.4%  
Agreement expires September 22, 2017 [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 77.0 314.7
Line of Credit Facility, Maximum Borrowing Capacity $ 250.0 650.0
Pricing on the Facility based on market rates LIBOR plus 1.4%  
Agreement expires September 22, 2017, Extension [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 400.0  
Agreement expires August 31, 2018 [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current 0.0 15.0
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 $ 35.2 116.1
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 $ 238.0 $ 581.0