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Debt - Unsecured Revolving Credit Facility (Details) - Unsecured debt - USD ($)
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Line of Credit Facility    
Outstanding borrowings $ 1,925,000,000 $ 1,925,000,000
Revolving credit facility    
Line of Credit Facility    
Outstanding borrowings 0 0
Remaining borrowing capacity 600,000,000 600,000,000
TOTAL BORROWING CAPACITY $ 600,000,000.0 $ 600,000,000
Extension period 1 year  
Revolving credit facility | Low    
Line of Credit Facility    
Annual facility fee rate 0.15%  
Revolving credit facility | High    
Line of Credit Facility    
Annual facility fee rate 0.30%  
Revolving credit facility | LIBOR | Low    
Line of Credit Facility    
Basis spread on variable rate 1.05%  
Revolving credit facility | LIBOR | High    
Line of Credit Facility    
Basis spread on variable rate 1.50%