Quarterly report pursuant to Section 13 or 15(d)

Unsecured Line of Credit Payable - Narrative (Details)

v3.20.1
Unsecured Line of Credit Payable - Narrative (Details)
3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2018
USD ($)
extension_option
Dec. 31, 2019
USD ($)
Mar. 29, 2018
USD ($)
Sep. 15, 2015
USD ($)
Line of Credit Facility [Line Items]            
One-month LIBOR (percent) 0.99% 0.99%        
Interest Rate Swap            
Line of Credit Facility [Line Items]            
Derivative notional amount       $ 600,000,000    
Credit Agreement 2018            
Line of Credit Facility [Line Items]            
Credit agreement, aggregate maximum borrowing capacity including accordion feature     $ 1,500,000,000      
2015 Term Loan            
Line of Credit Facility [Line Items]            
Debt instrument face amount           $ 150,000,000.0
2015 Term Loan | Interest Rate Swap            
Line of Credit Facility [Line Items]            
Derivative notional amount       150,000,000   $ 150,000,000.0
Derivative, fixed interest rate (percent)           2.72%
2018 Term Loan            
Line of Credit Facility [Line Items]            
Debt instrument face amount         $ 250,000,000.0  
2018 Term Loan | Interest Rate Swap            
Line of Credit Facility [Line Items]            
Derivative, fixed interest rate (percent)     2.87%   2.87%  
2018 Term Loan A | Interest Rate Swap            
Line of Credit Facility [Line Items]            
Derivative notional amount     $ 150,000,000.0 150,000,000 $ 150,000,000.0  
Derivative, fixed interest rate (percent)     2.31%   2.31%  
2018 Term Loan B            
Line of Credit Facility [Line Items]            
Debt instrument face amount         $ 100,000,000.0  
2018 Term Loan B | Interest Rate Swap            
Line of Credit Facility [Line Items]            
Derivative notional amount     $ 100,000,000.0 $ 100,000,000 $ 100,000,000.0  
Derivative, fixed interest rate (percent)     3.71%   3.71%  
Term Loan | 2015 Term Loan            
Line of Credit Facility [Line Items]            
Debt instrument face amount     $ 150,000,000.0      
Term Loan | 2018 Term Loan            
Line of Credit Facility [Line Items]            
Debt instrument face amount     250,000,000.0      
Term Loan | 2018 Term Loan | LIBOR | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate (percent)   0.85%        
Term Loan | 2018 Term Loan | LIBOR | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate (percent)   1.75%        
Term Loan | 2018 Term Loan | Base Rate | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate (percent)   0.00%        
Term Loan | 2018 Term Loan | Base Rate | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate (percent)   0.75%        
Term Loan | 2018 Term Loan A            
Line of Credit Facility [Line Items]            
Debt instrument face amount $ 150,000,000.0 $ 150,000,000.0        
Term Loan | 2018 Term Loan B            
Line of Credit Facility [Line Items]            
Proceeds from issuance of long-term debt     100,000,000.0      
Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Revolving credit facility borrowing capacity $ 700,000,000 $ 700,000,000 $ 700,000,000.0      
Debt instrument term (in years)     4 years      
Number of extensions allowed | extension_option     2      
Term of allowable extensions (in months)     6 months      
Commitment fee (percent) 0.20%          
Revolving Credit Facility | Minimum            
Line of Credit Facility [Line Items]            
Commitment fee (percent)   0.10%        
Revolving Credit Facility | Maximum            
Line of Credit Facility [Line Items]            
Commitment fee (percent)   0.30%        
Revolving Credit Facility | LIBOR            
Line of Credit Facility [Line Items]            
Basis spread on variable rate (percent) 1.00%          
Base rate component, spread on variable rate (percent)   1.00%        
Revolving Credit Facility | LIBOR | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate (percent)   0.775%        
Revolving Credit Facility | LIBOR | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate (percent)   1.55%        
Revolving Credit Facility | Base Rate | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate (percent)   0.00%        
Revolving Credit Facility | Base Rate | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate (percent)   0.55%        
Revolving Credit Facility | Federal Funds Rate            
Line of Credit Facility [Line Items]            
Base rate component, spread on variable rate (percent)   0.50%