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Unsecured senior notes payable (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Debt Instrument          
Outstanding Balance   $ 9,317,381   $ 9,317,381  
Loss on early extinguishment of debt   0 $ (52,770) (67,253) $ (52,770)
Commercial Paper          
Debt Instrument          
Outstanding Balance   750,000   750,000  
Commercial Paper, Maximum Issuance   1,500,000   1,500,000  
Total issuance of unsecured senior notes in Feb 2021          
Debt Instrument          
Total issuance of unsecured senior notes $ 1,750,000        
Weighted Average Interest Rate 2.49%        
Weighted average maturity years 20 years 4 months 24 days        
2.00% Unsecured Senior Notes Payable          
Debt Instrument          
Outstanding Balance   $ 900,000   $ 900,000  
Stated interest rate (as a percent)   2.00%   2.00%  
3.00% Unsecured Senior Notes Payable          
Debt Instrument          
Outstanding Balance   $ 850,000   $ 850,000  
Stated interest rate (as a percent)   3.00%   3.00%  
4.00% Unsecured Senior Notes Payable          
Debt Instrument          
Outstanding Balance   $ 650,000   $ 650,000  
Stated interest rate (as a percent)   4.00%   4.00%  
Cash tender offer settlement date       Feb. 10, 2021  
Unsecured senior notes payable redemption date       Mar. 12, 2021  
Loss on early extinguishment of debt       $ 67,200