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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
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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

X
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