v3.26.3
Acquisitions and Dispositions (Purchase Price and Opening Balance Sheet) (Details) - USD ($)
$ in Millions
9 Months Ended
Jul. 31, 2026
Sep. 30, 2026
Dec. 31, 2025
Business Combination [Line Items]      
Goodwill   $ 7,498.4 $ 3,502.8
Purchase consideration excludes direct acquisition costs   $ 23.5  
VodafoneZiggo Acquisition      
Business Combination [Line Items]      
Interest acquired 100.00%    
Cash and cash equivalents $ 0.0    
Trade receivables, net 192.7    
Current assets held for sale 820.9    
Other current assets 450.7    
Property and equipment, net 6,387.6    
Goodwill 4,169.4    
Intangible assets subject to amortization, net 6,090.0    
Other assets, net 705.9    
Current portion of debt and finance lease obligations (1,245.6)    
Current liabilities held for sale (120.0)    
Other accrued and current liabilities (1,289.9)    
Long-term debt and finance lease obligations (10,002.1)    
Long-term operating lease liabilities (207.0)    
Deferred tax liabilities (2,075.5)    
Other long-term liabilities (215.9)    
Total purchase consideration and fair value of previously held equity investment 3,661.2    
Purchase consideration excludes direct acquisition costs 23.5    
VodafoneZiggo Acquisition | Customer relationships      
Business Combination [Line Items]      
Intangible assets subject to amortization, net $ 5,015.7    
Intangible asset, weighted average remaining useful lives 17 years    
VodafoneZiggo Acquisition | Licensing Agreements      
Business Combination [Line Items]      
Intangible assets subject to amortization, net $ 723.0    
Intangible asset, weighted average remaining useful lives 9 years    
VodafoneZiggo Acquisition | Trade Names      
Business Combination [Line Items]      
Intangible assets subject to amortization, net $ 351.3    
Intangible asset, weighted average remaining useful lives 20 years    
VodafoneZiggo Acquisition | Liberty Global      
Business Combination [Line Items]      
Interest acquired 10.00%