v3.26.1
Discontinued Operations - Summary of Gain (Loss) on Disposal of OWN Segment and DAS Business Unit and Home business (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jan. 09, 2026
Jan. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Gain on disposal, net of income taxes         $ 7,009.3 $ 869.2
Discontinued Operations, Disposed of by Sale [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Gain on disposal before income taxes     $ 1.4 $ (0.6) 7,009.3 869.2
Discontinued Operations, Disposed of by Sale [Member] | C C S [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Cash consideration received (net of cash acquired) $ 10,541.7          
Transaction expense (81.3)          
Total disposal consideration 10,460.4          
Carrying value of net assets sold [1] (3,325.7)          
Gain on disposal before income taxes and reclassification of foreign currency translation and other 7,134.7          
Reclassification of foreign currency translation and other [2] (126.4)          
Gain on disposal before income taxes 7,008.3   $ 0.4 $ 0.0 $ 7,008.3 $ 0.0
Income tax expense [1] (1,653.3)          
Gain on disposal, net of income taxes [1] $ 5,355.0          
Discontinued Operations, Disposed of by Sale [Member] | OWN Segment and DAS Business Unit [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Cash consideration received (net of cash acquired)   $ 2,034.5        
Transaction expense   (9.1)        
Total disposal consideration   2,025.4        
Carrying value of net assets sold [1]   (1,057.3)        
Gain on disposal before income taxes and reclassification of foreign currency translation and other   968.1        
Reclassification of foreign currency translation and other [2]   (97.9)        
Gain on disposal before income taxes   870.2        
Income tax expense [1]   (378.9)        
Gain on disposal, net of income taxes [1]   $ 491.3        
[1] During the three months ended June 30, 2026, the Company recorded a $1.0 million adjustment to the carrying value of the OWN/DAS disposal group, along with the related tax effects, which impacted the gain on disposal recognized in discontinued operations.
[2] Includes the reclassifications of foreign currency translation, defined benefit plan activity and hedging instrument amounts from accumulated other comprehensive income (loss) on the Condensed Consolidated Balance Sheets related to the divestiture of the CCS segment during the first quarter of 2026. Includes the reclassification of foreign currency translation from accumulated other comprehensive income (loss) on the Condensed Consolidated Balance Sheets related to the divestiture of the OWN segment and DAS business unit during the first quarter of 2025.