Quarterly report pursuant to Section 13 or 15(d)

ACQUISITIONS AND DISPOSITIONS - Narrative (Details)

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ACQUISITIONS AND DISPOSITIONS - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
property
Mar. 31, 2022
property
Jun. 30, 2022
USD ($)
property
shares
Asset Acquisition [Line Items]      
Number of properties acquired | property 8 12 20
Estimated fair value of net assets acquired     $ 207.5
Acquisition-related costs capitalized     $ 2.6
Self storage property | property     1
Proceeds from sale of undeveloped land parcel     $ 6.2
Net gain on disposition     2.1
Real estate      
Asset Acquisition [Line Items]      
Recognized fair value allocated to real estate     203.7
Customer in-place leases      
Asset Acquisition [Line Items]      
Recognized fair value allocated to intangible assets     $ 3.8
Assets acquired from PROs | Affiliated entity      
Asset Acquisition [Line Items]      
Number of properties acquired | property     1
Estimated fair value of net assets acquired     $ 6.6
Northwest's Right to Property Management Contracts, Brand, Intellectual Property, Certain Tangible Assets      
Asset Acquisition [Line Items]      
Estimated fair value of net assets acquired     $ 3.2
Northwest's Right to Property Management Contracts, Brand, Intellectual Property, Certain Tangible Assets | OP units | NSA OP, LP      
Asset Acquisition [Line Items]      
Number of shares issued | shares     46,540