Quarterly report pursuant to Section 13 or 15(d)

Leasing Activity (Narrative) (Details)

v3.21.2
Leasing Activity (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Operating Leased Assets [Line Items]        
Rental income, variable lease payments $ 26.8 $ 24.4 $ 78.4 $ 72.2
Percentage of leased asset subjected to termination options 2.20%   2.20%  
Percentage of leased asset exercisable in period 1.30%   1.30%  
Termination option, exercisable through date     Dec. 31, 2021  
Minimum [Member]        
Operating Leased Assets [Line Items]        
Non-cancelable lease term 1 year   1 year  
Maximum [Member]        
Operating Leased Assets [Line Items]        
Non-cancelable lease term 10 years   10 years