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, 2022
property
Sep. 30, 2022
property
Jun. 30, 2022
property
Mar. 31, 2022
property
Dec. 31, 2021
property
Sep. 30, 2021
property
Jun. 30, 2021
property
Mar. 31, 2021
property
Dec. 31, 2022
USD ($)
property
shares
Dec. 31, 2021
USD ($)
property
Asset Acquisition [Line Items]                    
Number of properties acquired | property 2 23 8 12 110 76 20 23 45 229
Estimated fair value of net assets acquired                 $ 569.2 $ 2,200.0
Acquisition-related costs capitalized                 3.7 12.1
Aggregate revenue related to properties acquired during the year                 18.0 58.7
Operating income related to properties acquired during the year                 $ (1.8) 3.1
Self storage property disposed | property                 2  
Undeveloped land parcel, net proceeds                 $ 11.0  
Net gain of dispositions                 5.5  
Real Estate                    
Asset Acquisition [Line Items]                    
Recognized fair value allocated to real estate                 559.7 2,100.0
Customer in-place leases                    
Asset Acquisition [Line Items]                    
Recognized fair value allocated to intangible assets                 $ 9.5 $ 43.7
Asset acquired from PROs | Affiliated entity                    
Asset Acquisition [Line Items]                    
Number of properties acquired | property                 5 22
Estimated fair value of net assets acquired                 $ 55.7 $ 207.1
Northwest's Right To Property Management Contracts, Brand, Intellectual Property, Certain Tangible Assets                    
Asset Acquisition [Line Items]                    
Tangible assets                 $ 3.2  
Northwest's Right To Property Management Contracts, Brand, Intellectual Property, Certain Tangible Assets | OP units | NSA OP, LP                    
Asset Acquisition [Line Items]                    
OP units issued (in units) | shares                 46,540