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LONG-TERM OBLIGATIONS - Long-Term Debt Obligations (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Mar. 14, 2025
Jan. 14, 2025
Dec. 31, 2024
Debt Instrument [Line Items]        
Finance lease obligations $ 16.1     $ 16.6
Total 36,862.3     36,501.8
Less current portion of long-term obligations (2,816.9)     (3,693.0)
Long-term obligations 34,045.4     32,808.8
American Tower Corporation        
Debt Instrument [Line Items]        
Long-term debt 34,533.4     34,174.9
American Tower subsidiary        
Debt Instrument [Line Items]        
Long-term debt 2,312.8     2,310.3
2021 Term Loan | Unsecured debt | American Tower Corporation        
Debt Instrument [Line Items]        
Long-term debt 997.5     $ 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%      
Long-term debt $ 540.8     517.3
4.000% senior notes | Senior notes | American Tower Corporation        
Debt Instrument [Line Items]        
Debt interest rate (as a percent) 4.00%      
Long-term debt $ 749.8     749.4
1.300% senior notes | Senior notes | American Tower Corporation        
Debt Instrument [Line Items]        
Debt interest rate (as a percent) 1.30%      
Long-term debt $ 499.5     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 $ 499.5     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 $ 698.8     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 $ 539.7     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 $ 597.8     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 $ 997.0     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 $ 399.4     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 $ 748.2     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 $ 809.1     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 $ 538.5     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 $ 646.8     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 $ 646.6     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 $ 748.1     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 $ 697.2     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 $ 807.7     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 $ 648.0     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 $ 695.4     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 $ 645.5     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 $ 744.9     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 $ 644.1     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 $ 595.1     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 $ 808.0     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 $ 1,641.0     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 $ 745.4     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 $ 593.5     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 $ 643.9 $ 650.0   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 $ 536.2     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 $ 744.4     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 $ 536.0     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 $ 794.5     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 $ 695.8     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 $ 535.0     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 $ 693.8     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 $ 697.9     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 $ 643.9     643.7
5.650% senior notes | Senior notes | American Tower Corporation        
Debt Instrument [Line Items]        
Debt interest rate (as a percent) 5.65%      
Long-term debt $ 791.6     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 $ 535.4     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 $ 841.6     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 $ 742.3     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 $ 640.8     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 $ 533.8     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 $ 592.0     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 $ 346.1 $ 350.0   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 $ 592.6     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 $ 1,038.9     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 $ 1,024.0     1,023.8
Series 2015-2 notes | Secured debt | American Tower subsidiary        
Debt Instrument [Line Items]        
Long-term debt 524.9     524.7
Series 2018-1A securities | Secured debt | American Tower subsidiary        
Debt Instrument [Line Items]        
Long-term debt 497.8     497.6
Series 2023-1A Securities | Secured debt | American Tower subsidiary        
Debt Instrument [Line Items]        
Long-term debt 1,288.9     1,288.0
Other subsidiary debt | Unsecured debt | American Tower subsidiary        
Debt Instrument [Line Items]        
Long-term debt 1.2     0.0
Revolving Credit Facility | 2021 Multicurrency Credit Facility | American Tower Corporation        
Debt Instrument [Line Items]        
Long-term debt 50.0     0.0
Revolving Credit Facility | 2021 Credit Facility | American Tower Corporation        
Debt Instrument [Line Items]        
Long-term debt $ 360.0     $ 0.0