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Credit Facility (Details)
£ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
currency
Dec. 31, 2018
USD ($)
Dec. 31, 2019
GBP (£)
extension
Dec. 31, 2019
USD ($)
extension
Credit facility          
Credit facility origination costs     $ 14,248,000   $ 11,453,000
Outstanding balance     252,000,000   704,335,000
Unsecured debt | Revolving Credit Facility          
Credit facility          
Maximum borrowing capacity         $ 3,000,000,000.0
Number of extensions | extension       2 2
Term of extension option   6 months      
Number of currencies allowable per facility | currency   14      
Accordion expansion option   $ 1,000,000,000.0      
Outstanding balance     $ 252,000,000.0 £ 169.2 $ 704,300,000
Current borrowing capacity         $ 2,300,000,000
Weighted average borrowing rate during the period (as a percent)   3.10% 2.90%    
Weighted average interest rate at the end of the period (as a percent)     3.20% 2.20% 2.20%
Unsecured debt | Revolving Credit Facility | Other assets, net          
Credit facility          
Credit facility origination costs     $ 14,200,000   $ 11,500,000
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%      
Term Loans          
Credit facility          
Face amount of loan         250,000,000.0
Term Loans | $250 million senior unsecured term loan due Mar 2024          
Credit facility          
Face amount of loan $ 250,000,000.0       $ 250,000,000.0
Basis spread on variable rate (as a percent) 0.85%