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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

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