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Credit Facility (Details) - Line of Credit - USD ($)
1 Months Ended
Apr. 30, 2021
Jun. 30, 2021
Line of Credit Facility [Line Items]    
Line of credit facility $ 250,000,000.0  
Maximum cash and permitted investments adjustment $ 100,000,000.0  
Line of credit, amount available   $ 243,700,000
Minimum    
Line of Credit Facility [Line Items]    
Commitment fee (as a percent) 0.25%  
Maximum    
Line of Credit Facility [Line Items]    
Commitment fee (as a percent) 0.35%  
Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Long-term debt outstanding   0
Letter of Credit    
Line of Credit Facility [Line Items]    
Long-term debt outstanding   $ 6,300,000