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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

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