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Share-based Compensation (Summary Of Stock-Based Compensation) (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
€ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense $ 305.8 $ 206.0 $ 162.2  
Percent of annual inventive compensation 100.00%     100.00%
Other operating expenses        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense $ 3.9 4.4 4.7  
SG&A expenses        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense 301.9 201.6 157.5  
Liberty Global Plc        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense 281.1 184.3 131.4  
Performance-based incentive awards | Liberty Global Plc        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense 134.5 50.8 23.9  
Non-performance based incentive awards | Liberty Global Plc        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense 107.6 90.1 93.8  
Other | Liberty Global Plc        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense 39.0 43.4 13.7  
Telenet share-based incentive awards | Telenet        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense 15.6 19.6 20.7  
Other        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense $ 9.1 $ 2.1 $ 10.1  
Options | Telenet        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares reserved for future issuance (in shares) | shares 3,846,649     3,846,649
Awards outstanding (in EUR/USD per share) | (per share) $ 49.20     € 43.82