GOODWILL AND OTHER INTANGIBLE ASSETS - Other Intangible Assets Subject to Amortization (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 25,177.9	$ 25,473.9
Accumulated Amortization	(9,982.8)	(9,541.6)
Net Book Value	15,195.1	15,932.3
Acquired network location intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	5,499.3	5,584.9
Accumulated Amortization	(2,675.2)	(2,622.8)
Net Book Value	$ 2,824.1	$ 2,962.1
Acquired network location intangibles | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives (years)	30 years	20 years
Acquired tenant-related intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 18,242.1	$ 18,328.3
Accumulated Amortization	(6,842.3)	(6,477.1)
Net Book Value	$ 11,399.8	11,851.2
Acquired tenant-related intangibles | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives (years)	30 years
Acquired licenses and other intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 1,436.5	1,560.7
Accumulated Amortization	(465.3)	(441.7)
Net Book Value	$ 971.2	$ 1,119.0
Acquired licenses and other intangibles | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives (years)	2 years
Acquired licenses and other intangibles | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives (years)	30 years