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Revolving Credit Facility and Commercial Paper Programs (Details)
€ in Millions, £ in Millions
3 Months Ended
Mar. 31, 2023
USD ($)
currency
extension
Mar. 31, 2022
Mar. 31, 2023
GBP (£)
extension
Mar. 31, 2023
EUR (€)
extension
Dec. 31, 2022
USD ($)
Dec. 31, 2022
GBP (£)
Dec. 31, 2022
EUR (€)
Credit facility              
Credit facility origination costs $ 15,963,000       $ 17,196,000    
Commercial paper borrowings outstanding $ 157,500,000     € 145.0 701,800,000   € 361.0
Weighted average interest rate at the end of the period (as a percent) 3.10%   3.10% 3.10%      
Unsecured debt | U.S. Dollar-Denominated Unsecured Commercial Paper Program              
Credit facility              
Maximum aggregate capacity of commercial paper program $ 1,500,000,000            
Unsecured debt | Euro-Denominated Unsecured Commercial Paper Program              
Credit facility              
Maximum aggregate capacity of commercial paper program 1,500,000,000            
Revolving credit facility | Unsecured debt              
Credit facility              
Credit facility origination costs 16,000,000       17,200,000    
Current borrowing capacity 3,100,000,000            
Outstanding balance $ 1,100,000,000       $ 2,000,000,000 £ 70.0 € 1,800.0
Weighted average borrowing rate during the period (as a percent) 3.70% 1.10%          
Weighted average interest rate at the end of the period (as a percent) 5.40%   5.40% 5.40%      
Revolving credit facility | Unsecured debt | USD              
Credit facility              
Outstanding balance $ 770,000,000            
Revolving credit facility | Unsecured debt | GBP              
Credit facility              
Outstanding balance | £     £ 305.0        
Revolving credit facility | Unsecured debt | Multicurrency Credit Facility              
Credit facility              
Maximum borrowing capacity $ 4,250,000,000            
Number of extensions | extension 2   2 2      
Term of extension option 6 months            
Number of currencies allowable per facility | currency 14            
Credit facility expansion option $ 1,000,000,000            
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 chare (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 chare (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) 3.50% 0.50%