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Mortgage Servicing - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Servicing Asset at Amortized Cost [Line Items]      
UPB of portfolio loans acquired $ 31,700.0 $ 14,600.0 $ 144.1
Float balances 1,740.0 1,710.0 1,680.0
Agency and Non-Agency Mortgage Servicing Rights      
Servicing Asset at Amortized Cost [Line Items]      
UPB of MSRs sold $ 80.0 $ 140.8 $ 901.3