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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net income (loss) $ 912.6 $ (780.4) $ 1,791.7 $ 1,049.7
Other comprehensive income (loss):        
Reclassification of cumulative translation adjustments associated with the sale of ATC TIPL 0.0 1,072.3 0.0 1,072.3
Foreign currency translation adjustments, net of tax (benefit) expense of $(0.3), $0.1, $0.3 and $(0.2), respectively 121.9 350.5 1,593.3 (491.5)
Other comprehensive income 121.9 1,422.8 1,593.3 580.8
Comprehensive income 1,034.5 642.4 3,385.0 1,630.5
Comprehensive income attributable to noncontrolling interests (39.2) (155.1) (539.3) (47.8)
Comprehensive income attributable to American Tower Corporation stockholders $ 995.3 $ 487.3 $ 2,845.7 $ 1,582.7