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BUSINESS SEGMENTS - Summarized Segment Financial Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 06, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]            
Segment revenues   $ 2,717.4 $ 2,522.3 $ 7,907.1 $ 7,579.6  
Selling, general, administrative and development expense   233.0 227.7 704.2 690.3  
OPERATING INCOME   1,233.3 1,139.2 3,685.1 3,436.4  
Stock-based compensation expense   41.9 43.7 142.6 150.8  
Other selling, general, administrative and development expense   57.0 56.7 174.5 174.4  
Depreciation, amortization and accretion   522.9 498.5 1,525.7 1,527.9  
Other expense   300.7 593.8 1,563.9 1,122.3  
Income from continuing operations before income taxes   950.0 550.5 2,079.3 2,319.1  
Total assets   63,888.7 62,816.8 63,888.7 62,816.8 $ 61,077.4
Capital expenditures       1,128.8 1,162.9  
Unrealized gains on equity securities   10.9 67.9 129.2 93.9  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | South Africa Fiber            
Segment Reporting Information [Line Items]            
Gain on sale of subsidiary $ 53.6     53.6    
U.S. & Canada            
Segment Reporting Information [Line Items]            
Segment revenues   1,419.9 1,370.4 4,199.4 4,074.1  
Africa & APAC            
Segment Reporting Information [Line Items]            
Segment revenues   370.8 302.6 1,040.7 898.9  
Europe            
Segment Reporting Information [Line Items]            
Segment revenues   243.6 212.8 689.3 620.5  
Latin America            
Segment Reporting Information [Line Items]            
Segment revenues   416.5 402.8 1,205.1 1,297.0  
Data Centers            
Segment Reporting Information [Line Items]            
Segment revenues   266.6 233.7 772.6 689.1  
Operating Segments            
Segment Reporting Information [Line Items]            
Segment revenues   2,717.4 2,522.3 7,907.1 7,579.6  
Segment operating expenses   710.8 651.8 2,034.0 1,920.0  
Segment gross margin   2,006.6 1,870.5 5,873.1 5,659.6  
Selling, general, administrative and development expense   134.1 127.3 387.1 365.1  
OPERATING INCOME   1,872.5 1,743.2 5,486.0 5,294.5  
Operating Segments | Total  Property            
Segment Reporting Information [Line Items]            
Segment revenues   2,616.3 2,469.9 7,631.9 7,449.6  
Segment operating expenses   657.0 626.9 1,897.2 1,859.2  
Segment gross margin   1,959.3 1,843.0 5,734.7 5,590.4  
Selling, general, administrative and development expense   127.9 122.2 368.0 350.5  
OPERATING INCOME   1,831.4 1,720.8 5,366.7 5,239.9  
Total assets   63,569.1 62,135.6 63,569.1 62,135.6  
Capital expenditures       1,119.1 1,099.5  
Operating Segments | U.S. & Canada            
Segment Reporting Information [Line Items]            
Segment revenues   1,318.8 1,318.0 3,924.2 3,944.1  
Segment operating expenses   217.4 224.9 641.9 649.8  
Segment gross margin   1,101.4 1,093.1 3,282.3 3,294.3  
Selling, general, administrative and development expense   41.2 41.0 121.8 117.8  
OPERATING INCOME   1,060.2 1,052.1 3,160.5 3,176.5  
Total assets   26,927.5 26,928.2 26,927.5 26,928.2  
Capital expenditures       256.1 203.4  
Operating Segments | Africa & APAC            
Segment Reporting Information [Line Items]            
Segment revenues   370.8 302.6 1,040.7 898.9  
Segment operating expenses   114.1 94.4 317.9 286.2  
Segment gross margin   256.7 208.2 722.8 612.7  
Selling, general, administrative and development expense   18.5 18.0 57.5 52.7  
OPERATING INCOME   238.2 190.2 665.3 560.0  
Total assets   4,455.6 4,306.3 4,455.6 4,306.3  
Capital expenditures       151.7 189.4  
Operating Segments | Europe            
Segment Reporting Information [Line Items]            
Segment revenues   243.6 212.8 689.3 620.5  
Segment operating expenses   89.3 79.2 251.9 225.9  
Segment gross margin   154.3 133.6 437.4 394.6  
Selling, general, administrative and development expense   16.8 14.1 47.2 45.3  
OPERATING INCOME   137.5 119.5 390.2 349.3  
Total assets   12,904.7 12,051.6 12,904.7 12,051.6  
Capital expenditures       196.4 169.7  
Operating Segments | Latin America            
Segment Reporting Information [Line Items]            
Segment revenues   416.5 402.8 1,205.1 1,297.0  
Segment operating expenses   132.3 128.2 379.4 404.9  
Segment gross margin   284.2 274.6 825.7 892.1  
Selling, general, administrative and development expense   28.7 28.6 76.8 78.1  
OPERATING INCOME   255.5 246.0 748.9 814.0  
Total assets   8,553.2 8,388.9 8,553.2 8,388.9  
Capital expenditures       97.7 119.9  
Operating Segments | Data Centers            
Segment Reporting Information [Line Items]            
Segment revenues   266.6 233.7 772.6 689.1  
Segment operating expenses   103.9 100.2 306.1 292.4  
Segment gross margin   162.7 133.5 466.5 396.7  
Selling, general, administrative and development expense   22.7 20.5 64.7 56.6  
OPERATING INCOME   140.0 113.0 401.8 340.1  
Total assets   10,728.1 10,460.6 10,728.1 10,460.6  
Capital expenditures       417.2 417.1  
Operating Segments | Services            
Segment Reporting Information [Line Items]            
Segment revenues   101.1 52.4 275.2 130.0  
Segment operating expenses   53.8 24.9 136.8 60.8  
Segment gross margin   47.3 27.5 138.4 69.2  
Selling, general, administrative and development expense   6.2 5.1 19.1 14.6  
OPERATING INCOME   41.1 22.4 119.3 54.6  
Total assets   147.8 92.7 147.8 92.7  
Capital expenditures       0.0 0.0  
Other            
Segment Reporting Information [Line Items]            
Stock-based compensation expense   41.9 43.7 142.6 150.8  
Other selling, general, administrative and development expense   57.0 56.7 174.5 174.4  
Depreciation, amortization and accretion   522.9 498.5 1,525.7 1,527.9  
Other expense   300.7 593.8 1,563.9 1,122.3  
Total assets   $ 171.8 $ 588.5 171.8 588.5  
Capital expenditures       $ 9.7 $ 63.4