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Debt Warehouse Facilities (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 1,125.0 $ 1,025.0
Warehouse facilities 791.0 580.1
Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 2,750.0  
Unamortized Debt Issuance Expense $ 17.4 19.6
Pricing on the Facility based on market rates LIBOR plus 0.95% to 2.05%  
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 314.3 135.2
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, 2nd Extension [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 1,300.0  
Agreement expires August 31, 2018 [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current 77.4 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 $ 42.8 116.1
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 $ 791.7 581.0
Agreement expires September 25, 2017, Extension [Member] [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 525.0  
Agreement expires September 22, 2017 [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 500.0  
Agreement expires September 22, 2017 [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current 357.2 314.7
Line of Credit Facility, Maximum Borrowing Capacity $ 250.0 $ 650.0
Pricing on the Facility based on market rates LIBOR plus 1.35%