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Acquisition and Joint Venture Transactions (Pro Forma Information) (Details) - CWC, Choice, and Telenet Group Acquisitions [Member] - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Business Acquisition [Line Items]        
Revenue: $ 5,363.0 $ 5,333.4 $ 10,630.4 $ 10,652.0
Net loss attributable to Liberty Global shareholders 225.6 (516.4) 1.3 (1,225.3)
Liberty Global Group [Member]        
Business Acquisition [Line Items]        
Revenue: 4,471.2 4,424.0 8,829.7 8,822.7
Net loss attributable to Liberty Global shareholders $ 204.2 0.0 $ (129.8) 0.0
Basic earnings (loss) attributable to Liberty Global shareholders per share $ 0.22   $ (0.14)  
Diluted earnings (loss) attributable to Liberty Global shareholders per share $ 0.21   $ (0.14)  
LiLAC Group [Member]        
Business Acquisition [Line Items]        
Revenue: $ 891.8 909.4 $ 1,800.7 1,829.3
Net loss attributable to Liberty Global shareholders $ 21.4 0.0 $ 131.1 0.0
Basic earnings (loss) attributable to Liberty Global shareholders per share $ 0.38   $ 2.32  
Diluted earnings (loss) attributable to Liberty Global shareholders per share $ 0.37   $ 2.30  
Old Liberty Global [Member]        
Business Acquisition [Line Items]        
Net loss attributable to Liberty Global shareholders $ 0.0 $ (516.4) $ 0.0 $ (1,225.3)
Basic earnings (loss) attributable to Liberty Global shareholders per share   $ (0.52)   $ (1.24)
Diluted earnings (loss) attributable to Liberty Global shareholders per share   $ (0.52)   $ (1.24)