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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]        
Net income from continuing operations attributable to American Tower common stockholders, basic $ 853.3 $ 416.2 $ 1,708.8 $ 2,003.7
Net income from continuing operations attributable to American Tower common stockholders, diluted 853.3 416.2 1,708.8 2,003.7
Net loss from discontinued operations attributable to American Tower common stockholders, basic 0.0 (1,208.5) 0.0 (978.3)
Net loss from discontinued operations attributable to American Tower common stockholders, diluted 0.0 (1,208.5) 0.0 (978.3)
NET INCOME (LOSS) ATTRIBUTABLE TO AMERICAN TOWER CORPORATION COMMON STOCKHOLDERS, BASIC 853.3 (792.3) 1,708.8 1,025.4
NET INCOME (LOSS) ATTRIBUTABLE TO AMERICAN TOWER CORPORATION COMMON STOCKHOLDERS, DILUTED $ 853.3 $ (792.3) $ 1,708.8 $ 1,025.4
Basic weighted average common shares outstanding (in shares) 468,287 467,196 468,036 466,919
Dilutive securities (in shares) 752 1,065 820 1,082
Diluted weighted average common shares outstanding (in shares) 469,039 468,261 468,856 468,001
Basic net income from continuing operations attributable to American Tower Corporation common stockholders (in dollars per share) $ 1.82 $ 0.89 $ 3.65 $ 4.29
Basic net loss from discontinued operations attributable to American Tower Corporation common stockholders (in dollars per share) 0 (2.59) 0 (2.10)
Basic net income (loss) attributable to American Tower Corporation common stockholders (in dollars per share) 1.82 (1.70) 3.65 2.20
Diluted net income from continuing operations attributable to American Tower Corporation common stockholders (in dollars per share) 1.82 0.89 3.64 4.28
Diluted net loss from discontinued operations attributable to American Tower Corporation common stockholders (in dollars per share) 0 (2.58) 0 (2.09)
Diluted net income (loss) attributable to American Tower Corporation common stockholders (in dollars per share) $ 1.82 $ (1.69) $ 3.64 $ 2.19