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Segment Reporting (Revenue by Major Category) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Revenue	$ 2,868.0	$ 3,063.5
Total residential cable revenue
Segment Reporting Information [Line Items]
Revenue	1,917.7	2,091.3
Total subscription revenue
Segment Reporting Information [Line Items]
Revenue	1,863.7	2,010.0
Video
Segment Reporting Information [Line Items]
Revenue	692.1	747.2
Broadband internet
Segment Reporting Information [Line Items]
Revenue	802.8	840.8
Fixed-line telephony
Segment Reporting Information [Line Items]
Revenue	368.8	422.0
Non-subscription revenue
Segment Reporting Information [Line Items]
Revenue	54.0	81.3
Total residential revenue
Segment Reporting Information [Line Items]
Revenue	2,302.4	2,514.7
Subscription revenue
Segment Reporting Information [Line Items]
Revenue	228.0	243.9
Non-subscription revenue
Segment Reporting Information [Line Items]
Revenue	156.7	179.5
Total residential mobile revenue
Segment Reporting Information [Line Items]
Revenue	384.7	423.4
Total B2B revenue
Segment Reporting Information [Line Items]
Revenue	485.8	487.6
Subscription revenue
Segment Reporting Information [Line Items]
Revenue	113.8	108.2
Non-subscription revenue
Segment Reporting Information [Line Items]
Revenue	372.0	379.4
Other revenue
Segment Reporting Information [Line Items]
Revenue	$ 79.8	$ 61.2

X

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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