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Debt Warehouse Facilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity $ 1,025.0   $ 650.0
Unamortized Debt Issuance Expense     (18.1)
Warehouse Agreement Borrowings [Member]      
Line of Credit Facility [Line Items]      
Unamortized Debt Issuance Expense $ (0.9)   0.0
Line of Credit [Member]      
Line of Credit Facility [Line Items]      
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    
Unamortized Debt Issuance Expense (19.6)   (15.4)
Agreement expires February 28, 2017 [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity $ 650.0    
Agreement expires September 25, 2017 [Member]      
Line of Credit Facility [Line Items]      
Pricing on the Facility based on market rates LIBOR plus 1.4%    
Line of Credit, Outstanding Balance $ 135.2   0.0
Line of Credit Facility, Maximum Borrowing Capacity $ 275.0   0.0
Agreement expires September 22, 2017 [Member]      
Line of Credit Facility [Line Items]      
Pricing on the Facility based on market rates LIBOR plus 1.4%    
Line of Credit, Outstanding Balance $ 314.7   0.0
Line of Credit Facility, Maximum Borrowing Capacity 250.0   0.0
Agreement expires September 22, 2017, Extension [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity $ 650.0    
Agreement expires March 31, 2017 [Member]      
Line of Credit Facility [Line Items]      
Pricing on the Facility based on market rates LIBOR plus 1.6%    
Line of Credit, Outstanding Balance $ 15.0   18.4
Line of Credit Facility, Maximum Borrowing Capacity $ 100.0   100.0
Agreement expires October 17, 2016 [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   63.4
Line of Credit Facility, Maximum Borrowing Capacity $ 0.0   175.0
Agreement expires September 22,2016 [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   38.0
Line of Credit Facility, Maximum Borrowing Capacity 0.0   175.0
Variable rate, non-committed [Member]      
Line of Credit Facility [Line Items]      
Line of Credit, Outstanding Balance 0.0   128.7
Line of Credit Facility, Maximum Borrowing Capacity 0.0   200.0
Fannie Mae ASAP program [Member]      
Line of Credit Facility [Line Items]      
Fannie Mae ASAP Program, Outstanding Balance $ 116.1   14.6
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 $ 581.0   263.1
Line of Credit [Member]      
Line of Credit Facility [Line Items]      
Line of Credit, Outstanding Balance $ 580.1   $ 263.1
Line of Credit Facility, Maximum Borrowing Capacity   $ 2,000.0