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Debt Warehouse Facilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 61.5  
Warehouse Agreement Borrowings [Member]    
Line of Credit Facility [Line Items]    
Unamortized Debt Issuance Expense $ 1.2 $ 1.2
Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Interest Rate During Period 2.90% 2.00%
Line of Credit Facility, Average Outstanding Amount $ 364.1 $ 888.5
Pricing on the Facility based on market rates LIBOR plus 0.875% to 1.35%  
Line of Credit Facility, Maximum Borrowing Capacity $ 2,750.0  
Unamortized Debt Issuance Expense 15.9 15.3
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 23, 2019, Extension [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Outstanding Balance 217.3 156.4
Line of Credit Facility, Maximum Borrowing Capacity $ 375.0 375.0
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 1.3%  
Agreement expires September 29, 2018, Extension [Member]    
Line of Credit Facility [Line Items]    
Pricing on the Facility based on market rates LIBOR plus 1.25%  
Agreement expires August 31, 2018 [Member]    
Line of Credit Facility [Line Items]    
Pricing on the Facility based on market rates LIBOR plus 1.3%  
Fannie Mae ASAP program [Member]    
Line of Credit Facility [Line Items]    
Fannie Mae ASAP Program, Outstanding Balance $ 18.9 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 $ 319.1 310.4
Line of Credit Facility, Maximum Borrowing Capacity 1,250.0 850.0
Agreement expires September 20, 2019, Extension [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Outstanding Balance 82.9 74.8
Line of Credit Facility, Maximum Borrowing Capacity 775.0 375.0
Agreement expires August 31, 2019, Extension [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Outstanding Balance 0.0 0.0
Line of Credit Facility, Maximum Borrowing Capacity $ 100.0 $ 100.0