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Investments (Narrative) (Details)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Jun. 30, 2013
Ziggo N.V. [Member]
USD ($)
arrangement
Mar. 28, 2013
Ziggo N.V. [Member]
USD ($)
Mar. 28, 2013
Ziggo N.V. [Member]
EUR (€)
Jun. 30, 2013
Sumitomo Common Stock [Member]
Jun. 30, 2013
Canal Cyfrowy S.A. [Member]
Investment [Line Items]          
Number of common stock shares owned (in shares) 39,500,000     45,652,043  
Investment, share price (in dollar/euro per share)   $ 33.51 € 25.77    
Total investment   $ 1,324.7 € 1,018.6    
Number of arrangements 2        
Percentage of total outstanding common stock shares owned 19.77%     5.00% 17.00%
Proceeds from distribution $ 29.7