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Business Segment Reporting - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Segment Reporting Information [Line Items] |  |  |  |
MSR valuation adjustments, net | $ 16.4 | $ (27.9) | $ 134.2 | $ (85.4)
Interest expense | $ 74.3 | $ 50.4 | $ 204.8 | $ 126.1

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