v3.26.1
GOODWILL AND OTHER INTANGIBLE ASSETS - Other Intangible Assets Subject to Amortization (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Intangible Asset, Finite-Lived [Line Items]    
Gross Carrying Value $ 25,341.1 $ 25,480.9
Accumulated Amortization (11,360.5) (10,950.2)
Net Book Value 13,980.6 14,530.7
Acquired network location intangibles    
Intangible Asset, Finite-Lived [Line Items]    
Gross Carrying Value 5,489.1 5,511.3
Accumulated Amortization (2,858.9) (2,798.4)
Net Book Value $ 2,630.2 2,712.9
Acquired network location intangibles | Maximum    
Intangible Asset, Finite-Lived [Line Items]    
Estimated Useful Lives (years) 30 years  
Acquired tenant-related intangibles    
Intangible Asset, Finite-Lived [Line Items]    
Gross Carrying Value $ 18,527.6 18,636.8
Accumulated Amortization (7,902.6) (7,609.3)
Net Book Value $ 10,625.0 11,027.5
Acquired tenant-related intangibles | Maximum    
Intangible Asset, Finite-Lived [Line Items]    
Estimated Useful Lives (years) 30 years  
Acquired licenses and other intangibles    
Intangible Asset, Finite-Lived [Line Items]    
Gross Carrying Value $ 1,324.4 1,332.8
Accumulated Amortization (599.0) (542.5)
Net Book Value $ 725.4 $ 790.3
Acquired licenses and other intangibles | Minimum    
Intangible Asset, Finite-Lived [Line Items]    
Estimated Useful Lives (years) 2 years  
Acquired licenses and other intangibles | Maximum    
Intangible Asset, Finite-Lived [Line Items]    
Estimated Useful Lives (years) 30 years