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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

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