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Noncontrolling Interests	12 Months Ended
Noncontrolling Interests	Dec. 31, 2018
Noncontrolling Interests [Abstract]
Noncontrolling Interests	7.Noncontrolling Interests At December 31, 2018, the noncontrolling interests represent (i) third-party equity interests in subsidiaries owning 17 operating self-storage facilities and five self-storage facilities that are under construction and (ii) 231,978 partnership units held by third-parties in a subsidiary that are convertible on a one-for-one basis (subject to certain limitations) into common shares of the Company at the option of the unitholder (collectively, the “Noncontrolling Interests”). At December 31, 2018, the Noncontrolling Interests cannot require us to redeem their interests, other than pursuant to a liquidation of the subsidiary. During 2018, 2017 and 2016, we allocated a total of $6.2 million, $6.2 million and $6.9 million, respectively, of income to these interests; and we paid $7.0 million, $7.4 million and $7.6 million, respectively, in distributions to these interests. During 2017, we acquired Noncontrolling Interests for $14.4 million (none for 2018 or 2016) in cash, of which $7.7 million was allocated to Paid-in capital and $6.7 million as a reduction to Noncontrolling Interests. During 2018, 2017 and 2016, Noncontrolling Interests contributed $1.7 million, $2.5 million and $3.5 million, respectively.