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Mortgage Servicing - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Transfers and Servicing [Abstract]      
UPB of loans acquired $ 7,300.0 $ 67,300.0  
UPB of MSRs sold 11,100.0 13.1  
Float balances $ 1,800.0 $ 2,100.0 $ 2,100.0