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Mortgage Servicing - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Servicing Assets at Fair Value [Line Items]      
UPB of MSRs sold $ 13.1 $ 41.7  
UPB of loans acquired 67,300.0 5,700.0  
Float balances 2,100.0 1,900.0 $ 1,700.0
Performing GSE Loans      
Servicing Assets at Fair Value [Line Items]      
UPB of loans acquired $ 46,800.0 $ 575.3