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Interest Expense - Schedule of Components of Interest Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Debt securities:      
Interest expense $ 288.9 $ 273.6 $ 186.0
Amortization of debt discount and issuance costs 34.9 18.0 10.1
Other Secured Borrowings      
Debt securities:      
Interest expense 41.4 43.8 42.1
Amortization of debt discount and issuance costs 10.4 9.6 7.9
Senior Notes      
Debt securities:      
Interest expense 24.1 30.8 31.8
Mortgage Loan Warehouse Facilities      
Debt securities:      
Interest expense 98.5 77.8 37.8
MSR Financing Facilities      
Debt securities:      
Interest expense 72.4 70.6 47.0
Match Funded Liabilities      
Debt securities:      
Interest expense 37.3 41.4 19.8
Other      
Debt securities:      
Interest expense 7.4 9.3 7.5
Other | Oaktree      
Debt securities:      
Interest expense 0.8    
Senior Notes Due 2029      
Debt securities:      
Interest expense $ 7.8 $ 0.0 $ 0.0