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Subsequent Events (Details) - Acquisition of Self-Storage Facilities Other Investments
ft² in Millions, $ in Millions
 1 Months Ended 9 Months Ended
Oct. 30, 2023
USD ($)
ft²
storage_facility
state
Sep. 30, 2023
USD ($)
ft²
Subsequent Event [Line Items]    
Net rentable area acquired (in Sq.ft) | ft²   1.9
Total cost of acquisition | $   $ 301.3
Subsequent Event    
Subsequent Event [Line Items]    
Number of self-storage facilities acquired or under contract to be acquired | storage_facility 11  
Number of states self-storage facilities acquired or under contracts to be acquired | state 8  
Net rentable area acquired (in Sq.ft) | ft² 0.8  
Total cost of acquisition | $ $ 170.3