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Debt - Unsecured Term Loan (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
loan
Mar. 31, 2019
USD ($)
Debt Instrument [Line Items]    
Number of loans | loan 2  
Line Of Credit Facility Covenant Actual Results    
Debt Instrument [Line Items]    
Maximum leverage ratio (as a percent) 0.345  
Unsecured Term Loan    
Debt Instrument [Line Items]    
Debt instrument, term (in years) 5 years  
Principal balance $ 400.0  
Unsecured Term Loan | LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.40%  
Interest incurred on the facility $ 3.2 $ 3.4
Unsecured Term Loan | Less than 30% | LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.35%  
Unsecured Term Loan | Greater than or equal to 30% but less than 35% | LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.40%  
Unsecured Term Loan | Greater than or equal to 35% but less than 40% | LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.45%  
Unsecured Term Loan | Greater than or equal to 40% but less than 45% | LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.50%  
Unsecured Term Loan | Greater than or equal to 45% but less than 50% | LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.65%  
Unsecured Term Loan | Greater than or equal to 50% but less than 55% | LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.85%  
Unsecured Term Loan | Greater than or equal to 55% | LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate 2.00%  
Minimum | Unsecured Term Loan | Greater than or equal to 30% but less than 35%    
Debt Instrument [Line Items]    
Ratio of net indebtedness to EBITDA 0.30  
Minimum | Unsecured Term Loan | Greater than or equal to 35% but less than 40%    
Debt Instrument [Line Items]    
Ratio of net indebtedness to EBITDA 0.35  
Minimum | Unsecured Term Loan | Greater than or equal to 40% but less than 45%    
Debt Instrument [Line Items]    
Ratio of net indebtedness to EBITDA 0.40  
Minimum | Unsecured Term Loan | Greater than or equal to 45% but less than 50%    
Debt Instrument [Line Items]    
Ratio of net indebtedness to EBITDA 0.45  
Minimum | Unsecured Term Loan | Greater than or equal to 50% but less than 55%    
Debt Instrument [Line Items]    
Ratio of net indebtedness to EBITDA 0.5  
Minimum | Unsecured Term Loan | Greater than or equal to 55%    
Debt Instrument [Line Items]    
Ratio of net indebtedness to EBITDA 0.55  
Maximum | Unsecured Term Loan | Less than 30%    
Debt Instrument [Line Items]    
Ratio of net indebtedness to EBITDA 0.30  
Maximum | Unsecured Term Loan | Greater than or equal to 30% but less than 35%    
Debt Instrument [Line Items]    
Ratio of net indebtedness to EBITDA 0.35  
Maximum | Unsecured Term Loan | Greater than or equal to 35% but less than 40%    
Debt Instrument [Line Items]    
Ratio of net indebtedness to EBITDA 0.40  
Maximum | Unsecured Term Loan | Greater than or equal to 40% but less than 45%    
Debt Instrument [Line Items]    
Ratio of net indebtedness to EBITDA 0.45  
Maximum | Unsecured Term Loan | Greater than or equal to 45% but less than 50%    
Debt Instrument [Line Items]    
Ratio of net indebtedness to EBITDA 0.50  
Maximum | Unsecured Term Loan | Greater than or equal to 50% but less than 55%    
Debt Instrument [Line Items]    
Ratio of net indebtedness to EBITDA 0.55