v3.3.1.900
Acquisitions (Pending 2015 Acquisition and 2014 Acquisition) (Narrative) (Details)
€ / shares in Units, $ / shares in Units, € in Millions, $ in Millions
12 Months Ended
Dec. 09, 2014
USD ($)
Dec. 03, 2014
EUR (€)
€ / shares
Dec. 03, 2014
USD ($)
$ / shares
shares
Nov. 19, 2014
EUR (€)
shares
Nov. 19, 2014
USD ($)
shares
Nov. 11, 2014
EUR (€)
€ / shares
shares
Nov. 11, 2014
USD ($)
$ / shares
shares
Oct. 10, 2014
Dec. 31, 2014
USD ($)
Jun. 30, 2015
Dec. 03, 2014
USD ($)
Nov. 10, 2014
shares
Business Acquisition [Line Items]                        
Impact of Statutory Squeeze-out | $                 $ 416.7      
Additional paid-in capital [Member]                        
Business Acquisition [Line Items]                        
Impact of Statutory Squeeze-out | $                 $ (663.8)      
Ziggo Acquisition [Member]                        
Business Acquisition [Line Items]                        
Equity interest acquired (in shares)           136,603,794 136,603,794          
Business acquisition percentage of additional voting interests acquired             88.90%          
Business acquisition, cash consideration | $             $ 1,872.9          
Number of common stock shares owned (in shares)                       41,329,850
Cash acquired from acquisition | $             $ 16.8          
Weighted average useful life of acquired intangible assets           10 years 10 years          
Acquisition costs | $             $ 84.1          
Ziggo Acquisition [Member] | Class A Ordinary Shares [Member]                        
Business Acquisition [Line Items]                        
Business acquisition consideration issued (in shares)           31,172,985 31,172,985          
Ziggo Acquisition [Member] | Class C Ordinary Shares [Member]                        
Business Acquisition [Line Items]                        
Business acquisition consideration issued (in shares)           76,907,936 76,907,936          
Ziggo NCI Acquisition [Member]                        
Business Acquisition [Line Items]                        
Equity interest acquired (in shares)       18,998,057 18,998,057              
Ownership percentage       98.40% 98.40%              
Business acquisition, cash consideration       € 209.0 $ 260.7              
Ziggo NCI Acquisition [Member] | Class A Ordinary Shares [Member]                        
Business Acquisition [Line Items]                        
Business acquisition consideration issued (in shares)       4,335,357 4,335,357              
Ziggo NCI Acquisition [Member] | Class C Ordinary Shares [Member]                        
Business Acquisition [Line Items]                        
Business acquisition consideration issued (in shares)       10,695,906 10,695,906              
Ziggo Merger Agreement [Member]                        
Business Acquisition [Line Items]                        
Equity interest transferred in cash (in dollars per share) | (per share)           € 11.00 $ 13.71          
Ziggo Merger Agreement [Member] | Film1 [Member]                        
Business Acquisition [Line Items]                        
Commitment term               3 years        
Ziggo Merger Agreement [Member] | Netherlands Network [Member]                        
Business Acquisition [Line Items]                        
Commitment term               8 years        
Ziggo Merger Agreement [Member] | Class A Ordinary Shares [Member]                        
Business Acquisition [Line Items]                        
Equity interest transferred (in dollars per share) | $ / shares             0.2282          
Ziggo Merger Agreement [Member] | Class C Ordinary Shares [Member]                        
Business Acquisition [Line Items]                        
Equity interest transferred (in dollars per share) | $ / shares             $ 0.5630          
Ziggo Acquisition and Ziggo NCI Acquisition [Member]                        
Business Acquisition [Line Items]                        
Business acquisition, cash consideration           € 1,711.6 $ 2,133.6          
Ziggo Acquisition and Ziggo NCI Acquisition [Member] | Class A Ordinary Shares [Member]                        
Business Acquisition [Line Items]                        
Business acquisition consideration issued (in shares)           35,508,342 35,508,342          
Ziggo Acquisition and Ziggo NCI Acquisition [Member] | Class C Ordinary Shares [Member]                        
Business Acquisition [Line Items]                        
Business acquisition consideration issued (in shares)           87,603,842 87,603,842          
Ziggo Statutory Squeeze-Out [Member]                        
Business Acquisition [Line Items]                        
Equity interest acquired (in shares)     3,162,605                  
Equity interest transferred in cash (in dollars per share) | (per share)   € 39.78 $ 48.14                  
Expected redemption value of mandatorily redeemable noncontrolling interest   € 125.8                 $ 152.2  
Ziggo Statutory Squeeze-Out [Member] | Additional paid-in capital [Member]                        
Business Acquisition [Line Items]                        
Impact of Statutory Squeeze-out | $     $ 2.6                  
Searchlight [Member] | Choice Acquisition [Member]                        
Business Acquisition [Line Items]                        
Expected interest to be acquired 100.00%                      
Committed facilities to fund transaction costs | $ $ 257.5                      
Expected consideration to be transferred | $ $ 272.5                      
Searchlight [Member] | Choice Acquisition [Member] | Scenario, Forecast [Member]                        
Business Acquisition [Line Items]                        
Business acquisition percentage of voting interests acquired                   40.00%    
Liberty Global [Member] | Choice Acquisition [Member] | Scenario, Forecast [Member]                        
Business Acquisition [Line Items]                        
Business acquisition percentage of voting interests acquired                   60.00%