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Acquisitions (Details) € in Millions, $ in Millions, PLN in Billions	Apr. 01, 2017 USD ($)	Dec. 22, 2016 EUR (€)	Dec. 22, 2016 USD ($)	Oct. 18, 2016 PLN	Oct. 18, 2016 USD ($)	May 16, 2016 EUR (€)	Feb. 11, 2016 EUR (€)	Feb. 11, 2016 USD ($)	Mar. 31, 2017 USD ($)
Multimedia [Member]
Business Acquisition [Line Items]
Consideration transferred				PLN 3.0	$ 758.6
CWC [Member]
Business Acquisition [Line Items]
Direct acquisition costs \| €						€ 132.9
Customer Relationships [Member] \| CWC [Member]
Business Acquisition [Line Items]
Weighted average useful life of intangible assets						8 years
Telenet [Member] \| SFR BeLux [Member]
Business Acquisition [Line Items]
Consideration transferred		€ 400.0	$ 427.9
Telenet [Member] \| BASE [Member]
Business Acquisition [Line Items]
Consideration transferred							€ 1,318.9	$ 1,494.3
CWC [Member] \| U.S. Carve-out Entities [Member]
Business Acquisition [Line Items]
Due from related party									$ 148.8
CWC [Member] \| U.S. Carve-out Entities [Member] \| Subsequent Event [Member]
Business Acquisition [Line Items]
Consideration transferred	$ 86.2