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Commitments and Contingencies (Narrative) (Details) € in Millions, £ in Millions	1 Months Ended				3 Months Ended
	Oct. 31, 2019 USD ($)	Oct. 31, 2019 EUR (€)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 EUR (€)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2021 GBP (£)	Oct. 31, 2019 EUR (€)	Aug. 01, 2018
Loss Contingencies [Line Items]
Programming costs					$ 499,700,000	$ 468,200,000
Percent of customers					50.00%
Percent of reduction in monthly wholesale cable resale access prices									11.50%
Virgin Media VAT Matters
Loss Contingencies [Line Items]
Estimate of possible loss					$ 54,000,000.0		£ 41.3
Belgium Regulatory Developments
Loss Contingencies [Line Items]
Percent of reduction in monthly wholesale cable resale access prices									17.00%
Interkabel Acquisition
Loss Contingencies [Line Items]
Damages sought			$ 1,600,000,000	€ 1,400.0
Loss contingency accrual					$ 0
Deutsche Telekom Litigation
Loss Contingencies [Line Items]
Reduction of annual lease fees					83.33%
Discontinued Operations, Disposed of by Sale | UPC Austria [Member]
Loss Contingencies [Line Items]
Asserted claims	$ 82,800,000	€ 70.5
Amount of claim	$ 124,800,000							€ 106.2

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