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Revolving Credit Facility and Commercial Paper Program (Details)
2 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2021
USD ($)
extension
currency
Sep. 30, 2020
Jul. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Credit facility          
Credit facility origination costs   $ 5,137,000     $ 7,705,000
Maximum aggregate capacity of commercial paper program   1,000,000,000   $ 1,000,000,000  
Commercial paper borrowings outstanding   405,000,000     0
Unsecured debt | Revolving credit facility          
Credit facility          
Maximum borrowing capacity   $ 3,000,000,000      
Number of extensions | extension   2      
Term of extension option   6 months      
Number of currencies allowable per facility | currency   14      
Credit facility expansion option   $ 1,000,000,000      
Current borrowing capacity   3,000,000,000     3,000,000,000
Outstanding balance   $ 0     0
Weighted average borrowing rate during the period (as a percent)   0.80% 1.50%    
Unsecured debt | Revolving credit facility | Other assets, net          
Credit facility          
Credit facility origination costs   $ 5,100,000     $ 7,700,000
Unsecured debt | Revolving credit facility | LIBOR          
Credit facility          
Basis spread on variable rate (as a percent)   0.775%      
Commitment fee (as a percent)   0.125%      
All-in drawn variable interest rate (as a percent)   0.90%      
Commercial paper          
Credit facility          
Weighted average borrowing rate during the period (as a percent) 0.30% 0.20%      
Maturing October 14, 2021          
Credit facility          
Commercial paper borrowings outstanding   $ 80,000,000      
Maturing November 1, 2021          
Credit facility          
Commercial paper borrowings outstanding   290,000,000      
Maturing November 2, 2021          
Credit facility          
Commercial paper borrowings outstanding   $ 35,000,000