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Business Segment Reporting - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
MSR valuation adjustments, net $ 45.0 $ 31.5 $ 111.1 $ 75.8