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Debt (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 01, 2018
Sep. 30, 2018
Sep. 30, 2018
Aug. 10, 2018
Debt Instrument [Line Items]        
Maximum borrowing capacity under revolving credit facility   $ 800.0 $ 800.0  
Maximum amount outstanding under revolving credit facility   $ 161.0 $ 177.0  
Weighted average interest rate, before amortization of debt fees   2.80% 2.60%  
Weighted average borrowings outstanding   $ 85.9 $ 101.8  
Outstanding balance of revolving credit facility   $ 26.5 $ 26.5  
Mortgage loan | The Grove at Shrewsbury (West)        
Debt Instrument [Line Items]        
Principal amount of mortgage loan repayment $ 10.5      
Extended maturity date by one year | Term loan        
Debt Instrument [Line Items]        
Unsecured term loan       $ 275.0