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Interest Expense - Schedule of Components of Interest Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Debt securities: |  |  |  |
Interest expense | $ 75.6 | $ 73.1 | $ 142.7 | $ 140.5
Amortization of Debt Issuance Costs and Discounts |  |  | 11.6 | 17.9
OFC Senior Secured Notes |  |  |  |
Debt securities: |  |  |  |
Interest expense | 0.0 | 11.4 | 0.0 | 22.6
Senior Notes |  |  |  |
Debt securities: |  |  |  |
Interest expense | 0.0 | 6.5 | 0.0 | 13.9
MSR financing facilities |  |  |  |
Debt securities: |  |  |  |
Interest expense | 21.6 | 19.6 | 40.2 | 37.5
Mortgage loan financing facilities |  |  |  |
Debt securities: |  |  |  |
Interest expense | 31.8 | 24.8 | 57.9 | 43.5
Advance match funded liabilities |  |  |  |
Debt securities: |  |  |  |
Interest expense | 7.8 | 9.3 | 15.7 | 19.8
Escrow |  |  |  |
Debt securities: |  |  |  |
Interest expense | 1.6 | 1.4 | 3.3 | 3.2
Senior Notes Due 2029 |  |  |  |
Debt securities: |  |  |  |
Interest expense | $ 12.9 | $ 0.0 | $ 25.7 | $ 0.0

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