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Mortgage Servicing - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Servicing Asset at Amortized Cost [Line Items]      
Unpaid principal balance of non-agency and whole loans servicing agreements with minimum servicer ratings $ 25,900.0    
Unpaid principal balance of non-agency and whole loans servicing agreements with termination rights triggered $ 8,200.0    
Percentage of non-agency and whole loans servicing agreements with termination rights triggered of servicing portfolio 7.00%    
Float balances $ 1,700.0 $ 1,500.0 $ 2,100.0
Income recognized in connection with execution of clean-up call on securitization trusts 14.8    
Discount on repurchase price 2.8    
Agency And Non-Agency Mortgage Servicing Rights [Member]      
Servicing Asset at Amortized Cost [Line Items]      
UPB of MSRs sold $ 901.3 $ 219.4 $ 3,700.0