CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
REVENUES:
Total operating revenues	$ 2,818.6	$ 2,671.5	$ 8,357.5	$ 8,006.1
Costs of operations (exclusive of items shown separately below):
Property	803.3	808.8	2,400.4	2,374.3
Depreciation, amortization and accretion	762.9	898.1	2,321.6	2,540.4
Selling, general, administrative and development expense	231.9	231.2	740.2	748.0
Other operating expenses	27.3	52.8	216.5	98.6
Goodwill impairment	322.0	0.0	322.0	0.0
Total operating expenses	2,159.9	2,018.6	6,049.5	5,845.8
OPERATING INCOME	658.7	652.9	2,308.0	2,160.3
OTHER INCOME (EXPENSE):
Interest income	45.7	18.8	107.1	43.0
Interest expense	(359.2)	(294.0)	(1,047.5)	(833.0)
Loss on retirement of long-term obligations	0.0	(0.4)	(0.3)	(0.4)
Other income (including foreign currency gains of $238.6, $474.5, $46.9 and $1,111.3, respectively)	297.8	478.5	118.8	1,109.4
Total other (expense) income	(15.7)	202.9	(821.9)	319.0
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	643.0	855.8	1,486.1	2,479.3
Income tax provision	(65.7)	(36.1)	(132.3)	(66.0)
NET INCOME	577.3	819.7	1,353.8	2,413.3
Net loss attributable to noncontrolling interests	9.6	20.0	44.6	36.3
NET INCOME ATTRIBUTABLE TO AMERICAN TOWER CORPORATION COMMON STOCKHOLDERS, BASIC	586.9	839.7	1,398.4	2,449.6
NET INCOME ATTRIBUTABLE TO AMERICAN TOWER CORPORATION COMMON STOCKHOLDERS, DILUTED	$ 586.9	$ 839.7	$ 1,398.4	$ 2,449.6
NET INCOME PER COMMON SHARE AMOUNTS:
Basic net income attributable to American Tower Corporation common stockholders (in dollars per share)	$ 1.26	$ 1.80	$ 3.00	$ 5.32
Diluted net income attributable to American Tower Corporation common stockholders (in dollars per share)	$ 1.26	$ 1.80	$ 2.99	$ 5.31
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING (in thousands):
BASIC (in shares)	466,168	465,594	466,000	460,141
DILUTED (in shares)	467,161	466,801	467,034	461,360
Property
REVENUES:
Total operating revenues	$ 2,792.4	$ 2,609.9	$ 8,235.5	$ 7,825.2
Services
REVENUES:
Total operating revenues	26.2	61.6	122.0	180.9
Costs of operations (exclusive of items shown separately below):
Services	$ 12.5	$ 27.7	$ 48.8	$ 84.5