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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 46,631	$ 64,892
Other Comprehensive (Loss) Income:
Foreign Currency Translation Adjustment	(66,355)	(223,652)
Change in Fair Value of Derivative Instruments	15,206	(8,362)
Total Other Comprehensive (Loss) Income	(51,149)	(232,014)
Comprehensive (Loss) Income	(4,518)	(167,122)
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	897	(430)
Comprehensive (Loss) Income Attributable to Iron Mountain Incorporated	$ (5,415)	$ (166,692)

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