Annual report pursuant to Section 13 and 15(d)

Basis of Presentation (Details)

v3.8.0.1
Basis of Presentation (Details)
$ in Millions
12 Months Ended
Dec. 10, 2014
Oct. 29, 2014
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
May 18, 2016
Broadband Spin-Off Distribution Ratio   0.25      
Charter          
Voting interest acquired (as a percent)         25.01%
Liberty          
Related Party Transaction, Amounts of Transaction     $ 3.2 $ 3.4  
Series C common stock          
Subscription rights distribution ratio 0.20