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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