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Share-based Compensation (Stock Award Activity, Restricted Shares and PSUs) (Schedules) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restricted shares and RSUs [Member]
     
Weighted average grant-date fair value per share      
Granted (in dollars per shares) $ 71.47 $ 49.14 $ 44.79
Restricted shares and RSUs [Member] | Class A Ordinary Shares [Member]
     
Number of shares      
Outstanding at beginning of period (in shares) 332,008    
Virgin Media Replacement Awards (in shares) 900,408    
Granted (in shares) 128,958    
Forfeited (in shares) (46,605)    
Released from restrictions (in shares) (589,093)    
Outstanding at end of period (in shares) 725,676    
Weighted average grant-date fair value per share      
Outstanding at beginning of period (in dollars per shares) $ 40.53    
Virgin Media Replacement Awards (in dollars per share) $ 76.24    
Granted (in dollars per shares) $ 74.05    
Forfeited (in dollars per shares) $ 67.64    
Released from restrictions (in dollars per shares) $ 64.65    
Outstanding at end of period (in dollars per shares) $ 69.47    
Weighted average remaining contractual term, in years      
Outstanding at end of period 5 years 10 months 24 days    
Restricted shares and RSUs [Member] | Class C Ordinary Shares [Member]
     
Number of shares      
Outstanding at beginning of period (in shares) 332,301    
Virgin Media Replacement Awards (in shares) 671,923    
Granted (in shares) 128,958    
Forfeited (in shares) (38,726)    
Released from restrictions (in shares) (485,060)    
Outstanding at end of period (in shares) 609,396    
Weighted average grant-date fair value per share      
Outstanding at beginning of period (in dollars per shares) $ 39.13    
Virgin Media Replacement Awards (in dollars per share) $ 71.51    
Granted (in dollars per shares) $ 68.89    
Forfeited (in dollars per shares) $ 62.13    
Released from restrictions (in dollars per shares) $ 58.64    
Outstanding at end of period (in dollars per shares) $ 64.14    
Weighted average remaining contractual term, in years      
Outstanding at end of period 5 years 4 months 24 days    
PSUs [Member] | Class A Ordinary Shares [Member]
     
Number of shares      
Outstanding at beginning of period (in shares) 759,585    
Granted (in shares) 580,459    
Performance adjustment (in shares) (11,720)    
Forfeited (in shares) (75,273)    
Released from restrictions (in shares) (328,403)    
Outstanding at end of period (in shares) 924,648    
Weighted average grant-date fair value per share      
Outstanding at beginning of period (in dollars per shares) $ 46.54    
Granted (in dollars per shares) $ 71.97    
Performance adjustment (in dollars per shares) $ 40.75    
Forfeited (in dollars per shares) $ 69.70    
Released from restrictions (in dollars per shares) $ 40.75    
Outstanding at end of period (in dollars per shares) $ 62.75    
Weighted average remaining contractual term, in years      
Outstanding at end of period 1 year 4 months 24 days    
PSUs [Member] | Class C Ordinary Shares [Member]
     
Number of shares      
Outstanding at beginning of period (in shares) 759,585    
Granted (in shares) 549,047    
Performance adjustment (in shares) (11,720)    
Forfeited (in shares) (58,607)    
Released from restrictions (in shares) (328,403)    
Outstanding at end of period (in shares) 909,902    
Weighted average grant-date fair value per share      
Outstanding at beginning of period (in dollars per shares) $ 44.68    
Granted (in dollars per shares) $ 67.69    
Performance adjustment (in dollars per shares) $ 39.21    
Forfeited (in dollars per shares) $ 65.56    
Released from restrictions (in dollars per shares) $ 39.21    
Outstanding at end of period (in dollars per shares) $ 59.25    
Weighted average remaining contractual term, in years      
Outstanding at end of period 1 year 4 months 24 days