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Summary of Significant Accounting Policies (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
item
class
segment
Dec. 31, 2019
USD ($)
Number of reportable segments | segment 4  
Cash collateral offset against derivative liability positions $ 5.0  
Number of separate classes of servicing rights used for risk management purposes | class 2  
Number of repurchase agreements accounted for as components of linked transactions | item 0  
Unrecognized accrued taxes, interest and penalties $ 0.0 $ 0.0
The number of consecutive months contractual payments that must be received on a loan in non-accrual status before resuming recognition of interest income | item 3  
Borrowings under credit facilities | Maximum    
Maturity period 2 years  
Restricted cash    
Cash collateral not offset against derivative liability positions $ 10.5 $ 9.5