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Revolving Credit Facility and Commercial Paper Programs (Details)
$ in Thousands, € in Millions, £ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
currency
extension
Dec. 31, 2022
USD ($)
Dec. 31, 2023
EUR (€)
extension
Dec. 31, 2022
EUR (€)
Dec. 31, 2022
GBP (£)
Credit facility          
Credit facility origination costs $ 12,264 $ 17,196      
Commercial paper borrowings outstanding $ 764,400 701,800 € 583.0 € 361.0  
Weighted average interest rate at the end of the period (as a percent) 4.40%   4.40%    
Unsecured debt | U.S. Dollar-Denominated Unsecured Commercial Paper Program          
Credit facility          
Maximum aggregate capacity of commercial paper program $ 1,500,000        
Unsecured debt | Euro-Denominated Unsecured Commercial Paper Program          
Credit facility          
Maximum aggregate capacity of commercial paper program 1,500,000        
Revolving credit facility | Unsecured debt          
Credit facility          
Current borrowing capacity 4,250,000        
Outstanding balance $ 0 $ 2,000,000   € 1,800.0 £ 70.0
Weighted average borrowing rate during the period (as a percent) 4.80% 1.80%      
Credit facility origination costs $ 12,300 $ 17,200      
Revolving credit facility | Unsecured debt | Multicurrency Credit Facility          
Credit facility          
Maximum borrowing capacity $ 4,250,000        
Number of extensions | extension 2   2    
Term of extension option 6 months        
Number of currencies allowable per facility | currency 14        
Credit facility expansion option $ 1,000,000        
Revolving credit facility | Unsecured debt | Secured Overnight Financing Rate (SOFR) | Multicurrency Credit Facility          
Credit facility          
Basis spread on variable rate (as a percent) 0.725%        
Basis spread on variable rate, adjustment share (as a percent) 0.10%        
Commitment fee (as a percent) 0.125%        
All-in drawn variable interest rate (as a percent) 0.95%        
Revolving credit facility | Unsecured debt | Sterling Overnight Indexed Average (SONIA) | Multicurrency Credit Facility          
Credit facility          
Basis spread on variable rate (as a percent) 0.725%        
Basis spread on variable rate, adjustment share (as a percent) 0.0326%        
Commitment fee (as a percent) 0.125%        
All-in drawn variable interest rate (as a percent) 0.8826%        
Revolving credit facility | Unsecured debt | Euro Interbank Offered Rate (EURIBOR) | Multicurrency Credit Facility          
Credit facility          
Basis spread on variable rate (as a percent) 0.725%        
Commitment fee (as a percent) 0.125%        
All-in drawn variable interest rate (as a percent) 0.85%        
Commercial paper          
Credit facility          
Weighted average borrowing rate during the period (as a percent) 4.80% 1.60%