Quarterly report pursuant to Section 13 or 15(d)

Investments in Affiliates Accounted for Using the Equity Method (Details)

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Investments in Affiliates Accounted for Using the Equity Method (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 1 Months Ended
May 18, 2016
Nov. 30, 2014
May 31, 2014
May 31, 2013
Sep. 30, 2016
Dec. 31, 2015
Dec. 10, 2014
Charter              
Investments in affiliates accounted for using the Equity Method              
Number of shares of common shares acquired 22,000            
Share Price $ 195.70            
Cash paid to acquire equity method investments $ 4,300.0            
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity         $ 1,187.0    
Cash paid to exercise warrants   $ 52.0          
Common stock par value $ 0.001            
Business Acquisition, Percentage of Voting Interests Acquired 25.01%            
Liberty | Charter              
Investments in affiliates accounted for using the Equity Method              
Number of shares of common shares acquired     897 26,900      
Number of warrants acquired       1,100      
Purchase price of equity method investments     $ 124.5 $ 2,600.0      
Beneficial ownership percentage       27.00%      
Share Price       $ 95.50      
Cash paid to acquire equity method investments       $ 1,200.0      
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity       $ 2,532.0      
A/N              
Investments in affiliates accounted for using the Equity Method              
Maximum percentage of New Charter shares that may be voted by proxy 7.00%            
A/N | Charter              
Investments in affiliates accounted for using the Equity Method              
Proxy voting period 5 years            
Trading days before proposed sale of A/N 2 days            
first | A/N | Charter              
Investments in affiliates accounted for using the Equity Method              
Maximum percentage of New Charter shares that may be voted by proxy 7.00%            
last | A/N | Charter              
Investments in affiliates accounted for using the Equity Method              
Maximum percentage of New Charter shares that may be voted by proxy 7.00%            
Bright House Transaction | Charter              
Investments in affiliates accounted for using the Equity Method              
Number of shares of common shares acquired 3,700            
Purchase price of equity method investments $ 700.0            
Share Price $ 191.33            
Time Warner Cable Exchange | Charter              
Investments in affiliates accounted for using the Equity Method              
Number of shares of common shares acquired 2,400            
Fair Value of shares aquired $ 531.9            
Share exchange ratio 1            
Time Warner Cable Exchange | Liberty Interactive | Charter              
Investments in affiliates accounted for using the Equity Method              
Share exchange ratio 1            
Series C              
Investments in affiliates accounted for using the Equity Method              
Share Price $ 56.23           $ 40.36
Common stock par value $ 0.01       $ 0.01 $ 0.01