v3.26.3
GOODWILL AND OTHER INTANGIBLE ASSETS - Other Intangible Assets Subject to Amortization (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Intangible Asset, Finite-Lived [Line Items]    
Gross Carrying Value $ 25,227.7 $ 25,480.9
Accumulated Amortization (11,515.1) (10,950.2)
Net Book Value 13,712.6 14,530.7
Acquired network location intangibles    
Intangible Asset, Finite-Lived [Line Items]    
Gross Carrying Value 5,470.3 5,511.3
Accumulated Amortization (2,882.7) (2,798.4)
Net Book Value $ 2,587.6 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 $ 18,455.5 18,636.8
Accumulated Amortization (8,024.0) (7,609.3)
Net Book Value $ 10,431.5 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 $ 1,301.9 1,332.8
Accumulated Amortization (608.4) (542.5)
Net Book Value $ 693.5 $ 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