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Mortgage Servicing - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Transfers and Servicing [Abstract]      
UPB of loans acquired $ 3,800.0 $ 7,300.0  
UPB of MSRs sold 31.3 11,100.0  
Float balances $ 2,200.0 $ 1,800.0 $ 1,500.0