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NONCONTROLLING INTERESTS - Operating Partnership Ownership (Details) - CubeSmart, L.P. and Subsidiaries - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Operating Partnership Ownership      
Outstanding units of noncontrolling interest in the Operating Partnership (in shares) 1,238,205 1,300,462 1,418,549
Redemption value of OP units owned by third parties $ 55.9