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Subsequent Events (Narrative) (Details)
$ / shares in Units, ft² in Thousands, $ in Millions
 2 Months Ended 12 Months Ended
Feb. 04, 2023
$ / shares
Feb. 03, 2023
$ / shares
Feb. 21, 2023
USD ($)
ft²
storage_facility
state
Dec. 31, 2022
USD ($)
ft²
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Subsequent Event [Line Items]            
Net rentable area (in square feet) | ft²       204,217    
Acquisition of Self-Storage Facilities Other Investments            
Subsequent Event [Line Items]            
Total cost of acquisition | $       $ 730.5 $ 5,100.0 $ 792.3
Subsequent Event            
Subsequent Event [Line Items]            
Increase in regular common dividend 50.00%          
Common stock, quarterly dividends (in USD per share) | $ / shares $ 3.00 $ 2.00        
Common stock, annual dividends (in USD per share) | $ / shares $ 12.00 $ 8.00        
Subsequent Event | Acquisition of Self-Storage Facilities Other Investments            
Subsequent Event [Line Items]            
Number of self-storage facilities acquired or under contract to be acquired | storage_facility     8      
Number of states self-storage facilities acquired or under contracts to be acquired | state     5      
Net rentable area (in square feet) | ft²     500      
Total cost of acquisition | $     $ 70.5