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Mortgage Servicing - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Participating Mortgage Loans [Line Items]      
UPB of loans acquired $ 4,100.0 $ 6,000.0  
UPB of MSRs sold 11,100.0 7.2  
Float balances 2,100.0 $ 2,400.0 $ 2,100.0
GSE      
Participating Mortgage Loans [Line Items]      
UPB of MSRs sold $ 11,100.0