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Interest Expense - Schedule of Components of Interest Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt securities:      
Interest expense $ 273.6 $ 186.0 $ 144.0
Amortization of debt discount and issuance costs 18.0 10.1 7.8
Other Secured Borrowings      
Debt securities:      
Interest expense 43.8 42.1 31.7
Amortization of debt discount and issuance costs 9.6 7.9 5.0
Senior Notes      
Debt securities:      
Interest expense 30.8 31.8 31.9
Mortgage Loan Warehouse Facilities      
Debt securities:      
Interest expense 77.8 37.8 30.6
MSR Financing Facilities      
Debt securities:      
Interest expense 70.6 47.0 26.0
Match Funded Liabilities      
Debt securities:      
Interest expense 41.4 19.8 14.2
SSTL      
Debt securities:      
Interest expense 0.0 0.0 3.0
Other      
Debt securities:      
Interest expense $ 9.3 $ 7.5 $ 6.5