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Unsecured Line of Credit - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 16, 2020
Dec. 31, 2021
Jul. 31, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]        
Uncommitted line of credit $ 100      
Line of Credit Facility, Expiration Date   Dec. 16, 2023    
Line of Credit Facility, Description   The Line of Credit expires on December 16, 2023, at which time the Company may request additional one-year extensions thereafter. Interest under the Line of Credit is determined based on one-month U.S. dollar-denominated LIBOR plus 3.0%.    
Maximum Facility Size       $ 100
Increase in borrowing capacity     $ 450  
Line of Credit Facility, Interest Rate Description   one-month U.S. dollar-denominated LIBOR plus 3.0%    
Outstanding borrowings   $ 375   $ 0