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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

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