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Fair Value of Financial Instruments - Narratives (Details) - Discount rate
Mar. 31, 2021
Dec. 31, 2020
Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, measurement input 0.033 0.029
Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt securities, measurement input 0.047 0.033