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Commitments and Contingencies (Narrative) (Details) € 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, 2022 USD ($)	Mar. 31, 2021 USD ($)	May 26, 2020	Oct. 31, 2019 EUR (€)	Aug. 01, 2018
Loss Contingencies [Line Items]
Programming costs					$ 145,000,000	$ 474,900,000
Percentage of amounts recovered					50.00%
Percentage of net present value, cost savings					50.00%
Percentage of legal and other third party, fees					50.00%
Percent of reduction in monthly wholesale cable resale access prices							11.50%
Disposed of by sale | UPC Austria
Loss Contingencies [Line Items]
Asserted claims	$ 78,100,000	€ 70.5
Amount of claim	$ 140,000,000							€ 126.3
Interkabel Acquisition
Loss Contingencies [Line Items]
Damages sought			$ 1,600,000,000	€ 1,400.0
Loss contingency accrual					$ 0
Belgium Regulatory Developments
Loss Contingencies [Line Items]
Percent of reduction in monthly wholesale cable resale access prices									17.00%

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