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Related Party Transactions (Narrative) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
storageFacility
Sep. 30, 2020
USD ($)
Related Party Transaction [Line Items]    
Tenants reinsurance premiums earned by subsidiaries | $ $ 1.5 $ 1.1
Canada | Hughes Owned Canadian Facilities    
Related Party Transaction [Line Items]    
Number of self-storage facilities | storageFacility 65  
Ownership interest 0.00%  
Maximum | Canada | Hughes Owned Canadian Facilities    
Related Party Transaction [Line Items]    
Ownership interest 1.00%