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Summary of Significant Accounting Policies - Income (Loss) Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Income (Loss) Per Share-Basic and Diluted        
Net Income (Loss) $ 201,858 $ 276,522 $ 243,565 $ 323,153
Less: Net Income (Loss) Attributable to Noncontrolling Interests 1,777 1,237 1,185 2,265
Net Income (Loss) Attributable to Iron Mountain Incorporated (utilized in numerator of Earnings Per Share calculation) $ 200,081 $ 275,285 $ 242,380 $ 320,888
Weighted-average shares—basic (in shares) 290,756,000 289,247,000 290,542,000 289,001,000
Effect of dilutive potential stock options (in shares) 1,249,262 641,888 1,122,444 349,163
Effect of dilutive potential restricted stock, RSUs and PUs (in shares) 481,972 1,190,357 501,975 953,104
Weighted-average shares—diluted (in shares) 292,487,234 291,079,245 292,166,419 290,303,267
Basic (in dollars per share) $ 0.69 $ 0.95 $ 0.83 $ 1.11
Diluted (in dollars per share) $ 0.68 $ 0.95 $ 0.83 $ 1.11
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares) 234,085 381,900 494,833 2,544,984