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EARNINGS PER COMMON SHARE - Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Earnings Per Share [Abstract]    
Net income from continuing operations attributable to American Tower common stockholders, basic $ 488.7 $ 825.7
Net income from continuing operations attributable to American Tower common stockholders, diluted 488.7 825.7
Net income from discontinued operations attributable to American Tower common stockholders, basic 0.0 91.7
Net income from discontinued operations attributable to American Tower common stockholders, diluted 0.0 91.7
NET INCOME ATTRIBUTABLE TO AMERICAN TOWER CORPORATION COMMON STOCKHOLDERS, BASIC 488.7 917.4
NET INCOME ATTRIBUTABLE TO AMERICAN TOWER CORPORATION COMMON STOCKHOLDERS, DILUTED $ 488.7 $ 917.4
Basic weighted average common shares outstanding (in shares) 467,640 466,519
Dilutive securities (in shares) 879 1,141
Diluted weighted average common shares outstanding (in shares) 468,519 467,660
Basic net income from continuing operations attributable to American Tower Corporation common stockholders (in dollars per share) $ 1.05 $ 1.77
Basic net income from discontinued operations attributable to American Tower Corporation common stockholders (in dollars per share) 0 0.20
Basic net income attributable to American Tower Corporation common stockholders (in dollars per share) 1.05 1.97
Diluted net income from continuing operations attributable to American Tower Corporation common stockholders (in dollars per share) 1.04 1.77
Diluted net income from discontinued operations attributable to American Tower Corporation common stockholders (in dollars per share) 0 0.20
Diluted net income attributable to American Tower Corporation common stockholders (in dollars per share) $ 1.04 $ 1.96