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Segment Reporting (Revenue by Major Category) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Principal Transaction Revenue [Line Items]
Revenue	$ 11,541.5	$ 11,957.9	$ 11,276.4
Total residential cable revenue
Principal Transaction Revenue [Line Items]
Revenue	7,522.6	7,976.7	7,709.6
Total subscription revenue
Principal Transaction Revenue [Line Items]
Revenue	7,324.5	7,697.6	7,366.0
Video
Principal Transaction Revenue [Line Items]
Revenue	2,723.9	2,863.2	2,786.5
Broadband internet
Principal Transaction Revenue [Line Items]
Revenue	3,187.4	3,226.6	2,979.7
Fixed-line telephony
Principal Transaction Revenue [Line Items]
Revenue	1,413.2	1,607.8	1,599.8
Non-subscription revenue
Principal Transaction Revenue [Line Items]
Revenue	198.1	279.1	343.6
Total residential revenue
Principal Transaction Revenue [Line Items]
Revenue	9,142.9	9,655.0	9,316.4
Total residential mobile revenue
Principal Transaction Revenue [Line Items]
Revenue	1,620.3	1,678.3	1,606.8
Subscription revenue
Principal Transaction Revenue [Line Items]
Revenue	932.1	983.5	999.7
Non-subscription revenue
Principal Transaction Revenue [Line Items]
Revenue	688.2	694.8	607.1
Total B2B revenue
Principal Transaction Revenue [Line Items]
Revenue	1,914.0	1,983.5	1,740.1
Subscription revenue
Principal Transaction Revenue [Line Items]
Revenue	472.5	446.4	367.6
Non-subscription revenue
Principal Transaction Revenue [Line Items]
Revenue	1,441.5	1,537.1	1,372.5
Other revenue
Principal Transaction Revenue [Line Items]
Revenue	$ 484.6	$ 319.4	$ 219.9

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
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