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Real Estate Facilities (Narrative) (Details)
ft² in Millions, $ in Millions
 9 Months Ended
Sep. 30, 2023
USD ($)
ft²
storage_facility
Schedule Of Real Estate Facilities [Line Items]  
Aggregate costs to develop and expand $ 172.6
Net rentable area developed or expanded | ft² 0.9
Acquisition of Self-Storage Facilities Other Investments  
Schedule Of Real Estate Facilities [Line Items]  
Number of operating self-storage facilities acquired | storage_facility 26
Net rentable area acquired (in Sq.ft) | ft² 1.9
Total cost of acquisition $ 301.3
Payments to acquire intangible assets $ 8.9