Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details)

v3.20.2
Basis of Presentation (Details)
$ in Millions
3 Months Ended 9 Months Ended
Aug. 06, 2020
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
product
Sep. 30, 2019
USD ($)
Liberty          
Reimbursable amount | $   $ 1.0 $ 0.7 $ 3.2 $ 18.6
Liberty | CEO          
CEO compensation allocation percentage       18.00%  
Series A and B common stock | GCI Liberty          
Business combination shares issued ratio 0.58        
Series A Cumulative Redeemable Preferred Stock | GCI Liberty          
Business combination shares issued ratio 1        
Skyhook          
Number of primary products | product       2  
Charter          
Non-diluted voting interest       25.01%