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Debt Warehouse Facilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Line of Credit Facility [Line Items]    
Document Period End Date Dec. 31, 2022  
Line of Credit Facility, Maximum Borrowing Capacity $ 52.3  
Warehouse facilities 455.3 $ 795.7
Warehouse Agreement Borrowings [Member]    
Line of Credit Facility [Line Items]    
Unamortized Debt Issuance Expense $ 0.9 $ 1.2
Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Interest Rate During Period 2.90% 0.90%
Line of Credit Facility, Average Outstanding Amount $ 1,399.1 $ 432.0
Pricing on the Facility based on market rates SOFR plus 0.875% to 1.35%  
Line of Credit Facility, Maximum Borrowing Capacity $ 3,350.0 2,750.0
Unamortized Debt Issuance Expense $ 11.2 11.8
Agreement expires September 18, 2023, Extension [Member]    
Line of Credit Facility [Line Items]    
Pricing on the Facility based on market rates BSBY plus 1.30%  
Line of Credit, Current $ 215.7 516.9
Line of Credit Facility, Maximum Borrowing Capacity $ 700.0 700.0
Agreement expires September 15, 2023, Extension [Member]    
Line of Credit Facility [Line Items]    
Pricing on the Facility based on market rates SOFR plus 1.30%  
Line of Credit, Current $ 132.3 74.7
Line of Credit Facility, Maximum Borrowing Capacity $ 1,200.0 1,200.0
Agreement expires August 27, 2022 [Member]    
Line of Credit Facility [Line Items]    
Pricing on the Facility based on market rates LIBOR plus 1.30%  
Line of Credit, Current $ 0.0 192.8
Line of Credit Facility, Maximum Borrowing Capacity $ 0.0 300.0
Agreement expires July 28, 2023, Extension    
Line of Credit Facility [Line Items]    
Pricing on the Facility based on market rates SOFR plus 1.40%  
Line of Credit, Current $ 9.0 0.0
Line of Credit Facility, Maximum Borrowing Capacity 400.0 400.0
Fannie Mae ASAP program [Member]    
Line of Credit Facility [Line Items]    
Fannie Mae ASAP Program, Outstanding Balance $ 99.2 12.5
Debt Instrument, Interest Rate Terms SOFR plus 1.25%  
Line of Credit, Gross [Member]    
Line of Credit Facility [Line Items]    
Line of Credit, Current $ 456.2 796.9
Line of Credit Facility, Maximum Borrowing Capacity $ 2,300.0 $ 2,600.0