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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