Quarterly report pursuant to Section 13 or 15(d)

SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS - Narrative (Details)

v3.10.0.1
SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS - Narrative (Details)
$ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
property
Business Acquisition [Line Items]  
Acquisition-related costs capitalized $ 1.6
Recognized fair value allocated to real estate $ 298.2
Number of self storage properties sold | property 2
Number of real estate assets held for sale, sold | property 1
Gross selling price of self storage properties sold $ 5.5
Gain on sale of self storage properties 0.4
Customer In-Place Leases  
Business Acquisition [Line Items]  
Recognized fair value allocated to in-place leases $ 7.1
Affiliated Entity | Participating Regional Operator (PRO)  
Business Acquisition [Line Items]  
Number of self storage properties acquired | property 3
Estimated fair value of acquired self storage properties $ 19.7
Self Storage Properties  
Business Acquisition [Line Items]  
Number of self storage properties acquired | property 50
Estimated fair value of acquired self storage properties $ 305.3