v3.10.0.1

Acquisitions (Narrative) (Details) $ / shares in Units, € in Millions, $ in Millions |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 19, 2017 EUR (€) | Jun. 19, 2017 USD ($) | May 16, 2016 USD ($) shares | Feb. 11, 2016 EUR (€) | Feb. 11, 2016 USD ($) | Dec. 31, 2016 USD ($) | Jul. 01, 2016 shares | May 16, 2016 £ / shares | May 16, 2016 $ / shares
Viking Co NV |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage, noncontrolling interest |  |  |  | 50.00% | 50.00% |  |  |  |
SFR BeLux | Telenet |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cost of acquired entity | € 369.0 | $ 410.3 |  |  |  |  |  |  |
Committed facilities to fund transaction costs | € 210.0 | $ 234.3 |  |  |  |  |  |  |
BASE |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Direct acquisition costs | $ |  |  |  |  | $ 17.1 | $ 7.1 |  |  |
BASE | Mobile Spectrum |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Weighted average useful life of acquired intangible assets |  |  |  | 11 years | 11 years |  |  |  |
BASE | Customer relationships |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Weighted average useful life of acquired intangible assets |  |  |  | 7 years | 7 years |  |  |  |
BASE | Trademarks |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Weighted average useful life of acquired intangible assets |  |  |  | 20 years | 20 years |  |  |  |
BASE | Telenet |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cost of acquired entity |  |  |  | € 1,318.9 | $ 1,494.3 |  |  |  |
Committed facilities to fund transaction costs |  |  |  | € 1,000.0 | $ 1,100.0 |  |  |  |
CWC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cost of acquired entity | $ |  |  | $ 4,683.9 |  |  |  |  |  |
Special dividend issuable at closing (in dollars per share) | (per share) |  |  |  |  |  |  |  | £ 0.03 | $ 0.04
CWC | Liberty Global Shares | Class A |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition consideration issued (in shares) |  |  | 31,607,008 |  |  |  |  |  |
Share price (in dollar/euro per share) | $ / shares |  |  |  |  |  |  |  |  | 36.93
CWC | Liberty Global Shares | Class C |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition consideration issued (in shares) |  |  | 77,379,774 |  |  |  |  |  |
Share price (in dollar/euro per share) | $ / shares |  |  |  |  |  |  |  |  | 36.23
CWC | LiLAC Shares |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Inter-group interest distributed (in shares) |  |  |  |  |  |  | 117,430,965 |  |
CWC | LiLAC Shares | Class A |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition consideration issued (in shares) |  |  | 3,648,513 |  |  |  |  |  |
Share price (in dollar/euro per share) | $ / shares |  |  |  |  |  |  |  |  | 39.50
CWC | LiLAC Shares | Class C |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition consideration issued (in shares) |  |  | 8,939,316 |  |  |  |  |  |
Share price (in dollar/euro per share) | $ / shares |  |  |  |  |  |  |  |  | $ 41.98
CWC | Cable & Wireless Communications Limited (CWC) | Class C |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition consideration issued (in shares) |  |  | 4,433,222,313 |  |  |  |  |  |

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