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Summary of Significant Accounting Policies (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
class
segment
item
Mar. 31, 2020
segment
Dec. 31, 2020
USD ($)
item
Number of reportable segments | segment 4 4  
Cash collateral offset against derivative liability positions $ 3.5    
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 $ 6.4   $ 10.5