Annual report pursuant to Section 13 and 15(d)

SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS - Narrative (Details)

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SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2023
property
Sep. 30, 2023
property
Jun. 30, 2023
property
annex
Mar. 31, 2023
property
Dec. 31, 2022
property
Sep. 30, 2022
property
Jun. 30, 2022
property
Mar. 31, 2022
property
Dec. 31, 2023
USD ($)
property
Dec. 31, 2022
USD ($)
property
Asset Acquisition [Line Items]                    
Number of properties acquired | property 2 2 0 16 2 23 8 12 20 45
Number annexes acquired | annex     2              
Estimated fair value of net assets acquired                 $ 229.5 $ 569.2
Acquisition-related costs capitalized                 1.6 3.7
Aggregate revenue related to properties acquired during the year                 12.3 18.0
Operating income related to properties acquired during the year                 $ 10.9 $ 19.8
Self storage property disposed | property                 32 2
Undeveloped land parcel, net proceeds                 $ 262.3 $ 11.0
Net gain of dispositions                 $ 63.9 5.5
Number of properties | property 1,050               1,050  
Disposal Group, Held-for-Sale, Not Discontinued Operations | Participating Regional Operators In Eight States                    
Asset Acquisition [Line Items]                    
Number of properties | property 39               39  
Disposal Group, Held-for-Sale, Not Discontinued Operations | Participating Regional Operators In Seven States                    
Asset Acquisition [Line Items]                    
Number of properties | property 56               56  
Real Estate                    
Asset Acquisition [Line Items]                    
Recognized fair value allocated to real estate                 $ 224.7 559.7
Customer in-place leases                    
Asset Acquisition [Line Items]                    
Recognized fair value allocated to intangible assets                 $ 4.8 $ 9.5
Asset acquired from PROs | Affiliated entity                    
Asset Acquisition [Line Items]                    
Number of properties acquired | property                 19 5
Estimated fair value of net assets acquired                 $ 199.3 $ 55.7
Asset Acquisition From Retiredment of MoveIt | Affiliated entity                    
Asset Acquisition [Line Items]                    
Estimated fair value of net assets acquired                 $ 4.7