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Description of the Business (Details)
ft² in Millions
Sep. 30, 2023
ft²
storage_facility
country
state
Shurgard  
Nature Of Business [Line Items]  
PSA number of self-storage facilities | storage_facility 267
Net rentable area (in square feet) 15.0
Ownership interest (as percent) 35.00%
Number of countries in which entity operates | country 7
Public Storage  
Nature Of Business [Line Items]  
PSA number of self-storage facilities | storage_facility 3,028
Net rentable area (in square feet) 216.5
Number of states with facilities | state 40
Public Storage | Commercial and Retail Space  
Nature Of Business [Line Items]  
Net rentable area (in square feet) 1.2