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Debt Warehouse Facilities (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Sep. 30, 2017
Line of Credit Facility [Line Items]        
Debt Instrument, Face Amount $ 350.0   $ 350.0  
Line of Credit Facility, Maximum Borrowing Capacity 850.0 $ 1,025.0 850.0  
Warehouse Agreement Borrowings [Member]        
Line of Credit Facility [Line Items]        
Unamortized Debt Issuance Expense $ 1.2 $ 0.9 $ 1.2  
Line of Credit [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Interest Rate During Period 2.00% 1.50%    
Line of Credit Facility, Average Outstanding Amount $ 888.5 $ 981.6    
Pricing on the Facility based on market rates     LIBOR plus 0.95% to 2.05%  
Line of Credit Facility, Maximum Borrowing Capacity 2,750.0   $ 2,750.0  
Unamortized Debt Issuance Expense 15.3 19.6 $ 15.3  
Agreement expires September 25, 2017 [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity       $ 275.0
Agreement expires September 24, 2018, Extension [Member] [Member] [Member]        
Line of Credit Facility [Line Items]        
Pricing on the Facility based on market rates     LIBOR plus 1.4%  
Line of Credit, Outstanding Balance 156.4 135.2 $ 156.4  
Line of Credit Facility, Maximum Borrowing Capacity 375.0 275.0 $ 375.0  
Agreement expires September 29, 2018, Extension [Member]        
Line of Credit Facility [Line Items]        
Pricing on the Facility based on market rates     LIBOR plus 1.35%  
Line of Credit, Outstanding Balance 74.8 314.7 $ 74.8  
Line of Credit Facility, Maximum Borrowing Capacity 375.0 650.0 $ 375.0  
Agreement expires August 31, 2018 [Member]        
Line of Credit Facility [Line Items]        
Pricing on the Facility based on market rates     LIBOR plus 1.5%  
Line of Credit, Outstanding Balance 0.0 15.0 $ 0.0  
Line of Credit Facility, Maximum Borrowing Capacity 100.0 100.0 100.0  
Fannie Mae ASAP program [Member]        
Line of Credit Facility [Line Items]        
Fannie Mae ASAP Program, Outstanding Balance 79.2 116.1 $ 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, Outstanding Balance $ 310.4 $ 581.0 $ 310.4  
Agreement expires September 22, 2017 [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity       $ 250.0