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Mortgage Servicing - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Transfers and Servicing [Abstract]      
UPB of loans acquired $ 5,700.0 $ 10,800.0  
UPB of MSRs sold 41.7 100.1  
Float balances $ 1,900.0 $ 2,000.0 $ 1,700.0