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Share-based Compensation (Narrative) (Details)
$ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2019
shares
Mar. 31, 2019
shares
Feb. 29, 2016
Mar. 31, 2015
Dec. 31, 2019
USD ($)
installment
shares
Dec. 31, 2018
Dec. 31, 2017
shares
Dec. 31, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total compensation expense not yet recognized | $         $ 291.8      
Weighted average period remaining for expense recognition         2 years 1 month 6 days      
Percent of annual inventive compensation         100.00%      
PSUs | Class B                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted (in shares)         1,330,000      
PSUs | Class A                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted (in shares)         2,502,764      
PSUs | Class C                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted (in shares)         5,005,528      
RSAs | Class B                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted (in shares)         670,000      
April 1 and October 1 of 2017 | PSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage       50.00%        
PSUs earned       99.50%        
Performance period       2 years        
April 1, 2019 and October 1, 2019 | PSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage     50.00%          
Adjusted OIBDA CAGR     6.00%          
Performance period     3 years   2 years      
Liberty Global 2014 Incentive Plans                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share authorized (in shares)         155,000,000      
Liberty Global 2014 Incentive Plans | Class B                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share authorized (in shares)         50,250,000      
Liberty Global 2014 Incentive Plans | Anti-Dilution and Other Adjustment Provisions                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share authorized (in shares)         10,500,000      
Liberty Global Incentive Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share authorized (in shares)         71,262,640      
Liberty Global Incentive Plan | Awards other than Performance-Based Awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award term         7 years      
Liberty Global Incentive Plan | Six Month Anniversary After Grant Date                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage         12.50%      
Liberty Global Incentive Plan | Each Quarter Thereafter after Six Month Vest                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage         6.25%      
Liberty Global Director Incentive Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share authorized (in shares)         8,652,029      
Award term         7 years      
Number of equal or semi-equal installments | installment         3      
2016 PSUs | PSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Expected performance earnings for PSUs     82.30%          
2018 PSUs | PSUs | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Expected performance earnings for PSUs           50.00%    
Performance range           50.00%    
2018 PSUs | PSUs | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Expected performance earnings for PSUs           150.00%    
Performance range           125.00%    
2018 PSUs | April 1, 2020 | PSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage           50.00%    
2018 PSUs | October 1, 2020 | PSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage           50.00%    
2019 PSUs | PSUs | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Expected performance earnings for PSUs 50.00%              
Performance range 50.00%              
2019 PSUs | PSUs | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Expected performance earnings for PSUs 150.00%              
Performance range 125.00%              
2019 PSUs | April 1, 2021 | PSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage 50.00%              
2019 PSUs | October 1, 2021 | PSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage 50.00%              
Liberty Global Challenge Performance Awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage   100.00%            
Award term   10 years            
Performance period   3 years            
Liberty Global Challenge Performance Awards | Class A                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of ordinary share rights for each performance share (in shares)   1            
Liberty Global Challenge Performance Awards | Class C                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of ordinary share rights for each performance share (in shares)   1            
CEO | PSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted (in shares) 1,330,000              
CEO | RSAs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted (in shares) 670,000              
CEO | May 15, 2020 | PSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting (in shares) 670,000              
CEO | May 15, 2021 | PSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting (in shares) 660,000              
LiLAC Shares | CEO | Liberty Global Performance Grant Award | PSUs | Class B                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted (in shares)             41,589 33,333