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Mortgage Servicing - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Transfers and Servicing [Abstract]      
UPB of loans acquired $ 6,900.0 $ 13,700.0  
UPB of MSRs sold 40.7 11,100.0  
Float balances $ 2,300.0 $ 2,000.0 $ 1,500.0