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Business Segment Reporting - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |
MSR valuation adjustments, net | $ 31.5 | $ 16.4 | $ 75.8 | $ 134.2
Interest expense | $ 74.2 | $ 74.3 | $ 214.6 | $ 204.8

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