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Mortgage Servicing - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Transfers and Servicing [Abstract]      
UPB of loans acquired $ 13,700.0 $ 72,200.0  
UPB of MSRs sold 11,100.0 18.0  
Float balances $ 2,000.0 $ 3,300.0 $ 2,100.0