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Segment Information - Schedule of Adjusted EBITDA (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2025
Segment Reporting Information [Line Items]        
Revenues $ 2,225 $ 2,127 $ 2,225  
Segment Cost Of Revenue   714 727  
Other segment items   421 431  
Segment adjusted EBITDA   992 1,067  
Depreciation, amortization and accretion expense   (525) (480)  
Stock-based compensation expense (113) (101) (113)  
Transaction costs (6) (2) (6)  
Restructuring charges (10) 0   $ (41)
Interest income 47 24 47  
Interest expense (122) (104) (122)  
Other income (expense) 9 (6) 9  
Gain (loss) on debt extinguishment 0 (1)    
Income before income taxes 392 277 392  
UNITED STATES        
Segment Reporting Information [Line Items]        
Revenues $ 873 795    
UNITED KINGDOM        
Segment Reporting Information [Line Items]        
Revenues   218    
Colocation        
Segment Reporting Information [Line Items]        
Revenues   1,490 1,545  
Interconnection        
Segment Reporting Information [Line Items]        
Revenues   368 393  
Managed infrastructure        
Segment Reporting Information [Line Items]        
Revenues   118 115  
Other        
Segment Reporting Information [Line Items]        
Revenues   34 34  
Recurring revenues        
Segment Reporting Information [Line Items]        
Revenues   2,010 2,087  
Non-recurring revenues        
Segment Reporting Information [Line Items]        
Revenues   117 138  
Americas        
Segment Reporting Information [Line Items]        
Revenues   939 1,001  
Segment Cost Of Revenue   270 290  
Other segment items   260 268  
Segment adjusted EBITDA   409 443  
Americas | Colocation        
Segment Reporting Information [Line Items]        
Revenues   607 636  
Americas | Interconnection        
Segment Reporting Information [Line Items]        
Revenues   215 229  
Americas | Managed infrastructure        
Segment Reporting Information [Line Items]        
Revenues   66 63  
Americas | Other        
Segment Reporting Information [Line Items]        
Revenues   6 3  
Americas | Recurring revenues        
Segment Reporting Information [Line Items]        
Revenues   894 931  
Americas | Non-recurring revenues        
Segment Reporting Information [Line Items]        
Revenues   45 70  
EMEA        
Segment Reporting Information [Line Items]        
Revenues   727 743  
Segment Cost Of Revenue   305 281  
Other segment items   94 97  
Segment adjusted EBITDA   328 365  
EMEA | Colocation        
Segment Reporting Information [Line Items]        
Revenues   549 567  
EMEA | Interconnection        
Segment Reporting Information [Line Items]        
Revenues   83 87  
EMEA | Managed infrastructure        
Segment Reporting Information [Line Items]        
Revenues   35 35  
EMEA | Other        
Segment Reporting Information [Line Items]        
Revenues   24 27  
EMEA | Recurring revenues        
Segment Reporting Information [Line Items]        
Revenues   691 716  
EMEA | Non-recurring revenues        
Segment Reporting Information [Line Items]        
Revenues   36 27  
Asia-Pacific        
Segment Reporting Information [Line Items]        
Revenues   461 481  
Segment Cost Of Revenue   139 156  
Other segment items   67 66  
Segment adjusted EBITDA   255 259  
Asia-Pacific | Colocation        
Segment Reporting Information [Line Items]        
Revenues   334 342  
Asia-Pacific | Interconnection        
Segment Reporting Information [Line Items]        
Revenues   70 77  
Asia-Pacific | Managed infrastructure        
Segment Reporting Information [Line Items]        
Revenues   17 17  
Asia-Pacific | Other        
Segment Reporting Information [Line Items]        
Revenues   4 4  
Asia-Pacific | Recurring revenues        
Segment Reporting Information [Line Items]        
Revenues   425 440  
Asia-Pacific | Non-recurring revenues        
Segment Reporting Information [Line Items]        
Revenues   $ 36 $ 41