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Interest Expense - Schedule of Components of Interest Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Debt securities: |  |  |  |
Interest expense | $ 73.1 | $ 68.3 | $ 140.5 | $ 130.5
OFC Senior Secured Notes |  |  |  |
Debt securities: |  |  |  |
Interest expense | 11.4 | 10.9 | 22.6 | 21.7
Amortization of Debt Issuance Costs and Discounts | 2.8 | 2.4 | 5.6 | 4.7
Senior Notes |  |  |  |
Debt securities: |  |  |  |
Interest expense | 6.5 | 7.8 | 13.9 | 15.5
MSR financing facilities |  |  |  |
Debt securities: |  |  |  |
Interest expense | 19.6 | 17.8 | 37.5 | 35.3
Mortgage loan financing facilities |  |  |  |
Debt securities: |  |  |  |
Interest expense | 24.8 | 19.8 | 43.5 | 33.4
Advance match funded liabilities |  |  |  |
Debt securities: |  |  |  |
Interest expense | 9.3 | 10.4 | 19.8 | 21.1
Escrow |  |  |  |
Debt securities: |  |  |  |
Interest expense | $ 1.4 | $ 1.6 | $ 3.2 | $ 3.5

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