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Acquisitions and Discontinued Operation (Pro Forma Information) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Business Acquisition [Line Items]      
Revenue $ 94.7 $ 26.6 $ 294.6
Virgin Media Acquisition [Member]
     
Business Acquisition [Line Items]      
Revenue     13,065.7
Net loss attributable to Liberty Global shareholders     (1,178.5)
Basic and diluted loss attributable to Liberty Global shareholders per share     $ (1.48)
Continuing Operations [Member] | Virgin Media Acquisition [Member]
     
Business Acquisition [Line Items]      
Revenue     $ 12,771.1