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Debt Obligations - Bank Borrowings Terms (Details) - USD ($)
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Bank Borrowings    
Debt Obligations    
Maximum available under facility $ 1,000,000,000 $ 600,000,000
Additional extension period option 1 year  
Unused commitment fee (as a percent) 0.20%  
Bank Borrowings | LIBOR    
Debt Obligations    
Basis spread over base rate (as a percent) 1.15%  
Senior Unsecured Notes | Private Shelf Agreement Prudential    
Debt Obligations    
Maximum available under facility $ 337,500,000