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Mortgage Servicing - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Servicing Asset at Amortized Cost [Line Items]      
UPB of portfolio loans acquired $ 14,600.0 $ 144.1  
UPB of MSRs sold 76,100.0    
Float balances 1,700.0 1,700.0 $ 1,500.0
Agency and Non-Agency Mortgage Servicing Rights      
Servicing Asset at Amortized Cost [Line Items]      
UPB of MSRs sold 140.8 $ 901.3 $ 200.0
NRZ      
Servicing Asset at Amortized Cost [Line Items]      
UPB of MSRs sold $ 18,500.0    
Servicing Portfolio | Customer Concentration Risk | NRZ      
Servicing Asset at Amortized Cost [Line Items]      
Concentration risk (percentage) 20.00%