v3.3.1.900
Debt and Capital Lease Obligations (VM Convertible Notes) (Details) - USD ($)
12 Months Ended
Dec. 31, 2014
Jun. 07, 2013
Apr. 30, 2008
Virgin Media Acquisition [Member]      
Debt Instrument [Line Items]      
Additional paid-in capital   $ (1,660,000,000)  
VM Convertible Notes [Member]      
Debt Instrument [Line Items]      
Principal amount of debt $ 54,800,000   $ 1,000,000,000
Stated interest rate of debt     6.50%
Fair value of debt 113,700,000 2,716,800,000  
Debt conversion amount 885,100,000    
Debt conversion, principal amount 944,200,000    
Debt Component [Member] | VM Convertible Notes [Member]      
Debt Instrument [Line Items]      
Fair value of debt   $ 1,056,800,000  
Equity Component [Member] | VM Convertible Notes [Member]      
Debt Instrument [Line Items]      
Fair value of debt 998,800,000    
Exchange Per $1000 Principal Amount [Member] | VM Convertible Notes [Member]      
Debt Instrument [Line Items]      
Debt conversion amount 910.51    
Debt conversion, principal amount $ 1,000    
Class A Ordinary Shares [Member] | VM Convertible Notes [Member]      
Debt Instrument [Line Items]      
Shares issued upon conversion 13,100,000    
Class A Ordinary Shares [Member] | Exchange Per $1000 Principal Amount [Member] | VM Convertible Notes [Member]      
Debt Instrument [Line Items]      
Shares issued upon conversion 13.4339    
Class C Ordinary Shares [Member] | VM Convertible Notes [Member]      
Debt Instrument [Line Items]      
Shares issued upon conversion 9,800,000    
Class C Ordinary Shares [Member] | Exchange Per $1000 Principal Amount [Member] | VM Convertible Notes [Member]      
Debt Instrument [Line Items]      
Shares issued upon conversion 33.4963