v3.26.1
LONG-TERM OBLIGATIONS - Offerings of Senior Notes (Details)
€ in Millions, $ in Millions
6 Months Ended
May 27, 2026
USD ($)
May 27, 2026
EUR (€)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
May 27, 2026
EUR (€)
Debt Instrument [Line Items]          
Proceeds from issuance of senior notes     $ 872.2 $ 1,560.0  
American Tower Corporation | Senior notes | 4.000% Senior Notes due 2033          
Debt Instrument [Line Items]          
Stated interest rate (as a percent) 4.00%   4.00%   4.00%
Aggregate principal amount $ 872.0   $ 872.0   € 750.0
Proceeds from issuance of senior notes $ 863.5 € 742.7      
Maximum adjusted EBITDA     3.5    
American Tower Corporation | Senior notes | 4.000% Senior Notes due 2033 | Debt Instrument, Redemption Option Two          
Debt Instrument [Line Items]          
Redemption price percentage 101.00% 101.00%