Segment Reporting (Capital Expenditures of Reportable Segments) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Property and equipment additions	$ 2,169.5	$ 2,603.6	$ 2,785.4
Assets acquired under capital-related vendor financing arrangements	(661.1)	(1,339.6)	(1,710.7)
Assets acquired under finance leases	(42.6)	(48.7)	(66.4)
Changes in current liabilities related to capital expenditures	(57.8)	77.5	159.9
Total capital expenditures, net	1,408.0	1,292.8	1,168.2
VMO2 JV
Segment Reporting Information [Line Items]
Property and equipment additions:	1,706.4	0.0	0.0
VodafoneZiggo JV
Segment Reporting Information [Line Items]
Property and equipment additions:	990.5	918.7	887.9
Operating Segments \| Switzerland
Segment Reporting Information [Line Items]
Property and equipment additions	609.9	302.8	277.9
Operating Segments \| Belgium
Segment Reporting Information [Line Items]
Property and equipment additions	573.5	513.6	537.2
Operating Segments \| U.K.
Segment Reporting Information [Line Items]
Property and equipment additions	557.4	1,347.2	1,493.0
Operating Segments \| Ireland
Segment Reporting Information [Line Items]
Property and equipment additions	94.4	85.6	85.0
Central and Other
Segment Reporting Information [Line Items]
Property and equipment additions	$ 334.3	$ 354.4	$ 392.3

Assets Acquired Under Capital-Related Vendor Financing Arrangements

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Equity Method Investment, Summarized Financial Information, Payment to Acquire Property, Plant and Equipment

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Increase Decrease in Current Liabilities Related to Capital Expenditures

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Amount of increase in lease obligation from new lease.

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-Name Accounting Standards Codification
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The cash outflow for acquisition of or capital improvements to properties held for investment (operating, managed, leased) or for use.

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Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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