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LONG-TERM OBLIGATIONS - Long-Term Debt Obligations (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 16, 2025
Sep. 12, 2025
May 30, 2025
Apr. 03, 2025
Mar. 14, 2025
Jan. 14, 2025
Dec. 31, 2024
Debt Instrument [Line Items]                
Finance lease obligations $ 15.9             $ 16.6
Total 37,238.9             36,501.8
Less current portion of long-term obligations (2,387.7)             (3,693.0)
Long-term obligations 34,851.2             32,808.8
American Tower Corporation                
Debt Instrument [Line Items]                
Long-term debt 35,428.6             34,174.9
American Tower subsidiary                
Debt Instrument [Line Items]                
Long-term debt 1,794.4             2,310.3
2021 Term Loan | Unsecured debt | American Tower Corporation                
Debt Instrument [Line Items]                
Long-term debt 997.9             $ 997.9
2.950% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent)             2.95% 2.95%
Long-term debt 0.0             $ 650.0
2.400% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent)           2.40%   2.40%
Long-term debt 0.0             $ 749.7
1.375% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent)         1.375%     1.375%
Long-term debt 0.0             $ 517.3
4.000% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent)       4.00%       4.00%
Long-term debt 0.0             $ 749.4
1.300% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent)     1.30%         1.30%
Long-term debt $ 0.0             $ 499.3
4.400% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 4.40%              
Long-term debt $ 499.8             499.3
1.600% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 1.60%              
Long-term debt $ 699.4             698.5
1.950% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 1.95%              
Long-term debt $ 586.0             516.4
1.450% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 1.45%              
Long-term debt $ 598.5             597.4
3.375% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 3.375%              
Long-term debt $ 998.0             996.6
3.125% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 3.125%              
Long-term debt $ 399.5             399.3
2.750% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 2.75%              
Long-term debt $ 748.7             748.0
0.450% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 0.45%              
Long-term debt $ 878.5             774.1
0.400% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 0.40%              
Long-term debt $ 585.0             515.0
3.650% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 3.65%              
Long-term debt $ 647.6             646.4
4.125% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 4.125%              
Long-term debt $ 702.1             618.5
3.55% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 3.55%              
Long-term debt $ 748.5             747.9
3.600% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 3.60%              
Long-term debt $ 697.7             697.0
0.500% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 0.50%              
Long-term debt $ 877.1             772.6
1.500% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 1.50%              
Long-term debt $ 648.3             647.8
5.500% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 5.50%              
Long-term debt $ 696.1             695.0
5.250% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 5.25%              
Long-term debt $ 646.1             645.2
5.800% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 5.80%              
Long-term debt $ 745.5             744.6
5.200% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 5.20%              
Long-term debt $ 644.8             643.7
3.950% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 3.95%              
Long-term debt $ 595.7             594.8
0.875% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 0.875%              
Long-term debt $ 877.1             773.0
3.800% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 3.80%              
Long-term debt $ 1,641.9             1,640.5
2.900% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 2.90%              
Long-term debt $ 745.8             745.1
5.000% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 5.00%              
Long-term debt $ 594.1             593.2
4.900% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 4.90% 4.90%            
Long-term debt $ 847.9             0.0
3.900% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 3.90%              
Long-term debt $ 582.4             512.9
2.100% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 2.10%              
Long-term debt $ 744.9             744.1
0.950% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 0.95%              
Long-term debt $ 582.1             512.6
1.875% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 1.875%              
Long-term debt $ 795.0             794.3
2.700% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 2.70%              
Long-term debt $ 696.1             695.6
4.625% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 4.625%              
Long-term debt $ 581.3             511.7
2.300% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 2.30%              
Long-term debt $ 694.3             693.6
1.000% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 1.00%              
Long-term debt $ 757.9             667.6
4.050% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 4.05%              
Long-term debt $ 644.2             643.7
3.625% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 3.625%     3.625%        
Long-term debt $ 583.2             0.0
5.650% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 5.65%              
Long-term debt $ 792.1             791.4
1.250% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 1.25%              
Long-term debt $ 581.6             512.1
5.550% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 5.55%              
Long-term debt $ 842.0             841.4
5.900% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 5.90%              
Long-term debt $ 742.7             742.2
5.450% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 5.45%              
Long-term debt $ 641.2             640.6
4.100% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 4.10%              
Long-term debt $ 580.0             510.5
5.400% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 5.40%              
Long-term debt $ 592.4             591.9
5.350% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 5.35% 5.35%            
Long-term debt $ 731.5             0.0
3.700% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 3.70%              
Long-term debt $ 592.7             592.6
3.100% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 3.10%              
Long-term debt $ 1,039.1             1,038.8
2.950% senior notes | Senior notes | American Tower Corporation                
Debt Instrument [Line Items]                
Debt interest rate (as a percent) 2.95%              
Long-term debt $ 1,024.3             1,023.8
Series 2015-2 notes | Secured debt | American Tower subsidiary                
Debt Instrument [Line Items]                
Long-term debt 0.0             524.7
Series 2018-1A securities | Secured debt | American Tower subsidiary                
Debt Instrument [Line Items]                
Long-term debt 498.1             497.6
Series 2023-1A Securities | Secured debt | American Tower subsidiary                
Debt Instrument [Line Items]                
Long-term debt 1,290.8             1,288.0
Other subsidiary debt | Unsecured debt | American Tower subsidiary                
Debt Instrument [Line Items]                
Long-term debt 5.5             0.0
Revolving Credit Facility | 2021 Multicurrency Credit Facility | American Tower Corporation                
Debt Instrument [Line Items]                
Long-term debt 445.0             0.0
Revolving Credit Facility | 2021 Credit Facility | American Tower Corporation                
Debt Instrument [Line Items]                
Long-term debt $ 815.0             $ 0.0