v3.10.0.1

Segment Reporting (Revenue by Major Category) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Principal Transaction Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 2,949.1 | $ 2,929.7 | $ 3,015.6 | $ 3,063.5 | $ 2,987.8 | $ 2,899.3 | $ 2,746.8 | $ 2,642.5 | $ 11,957.9 | $ 11,276.4 | $ 13,731.1
Total residential cable revenue |  |  |  |  |  |  |  |  |  |  |
Principal Transaction Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 7,976.7 | 7,709.6 | 10,100.4
Total subscription revenue |  |  |  |  |  |  |  |  |  |  |
Principal Transaction Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 7,697.6 | 7,366.0 | 9,788.5
Video |  |  |  |  |  |  |  |  |  |  |
Principal Transaction Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 2,863.2 | 2,786.5 | 4,060.0
Broadband internet |  |  |  |  |  |  |  |  |  |  |
Principal Transaction Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 3,226.6 | 2,979.7 | 3,579.0
Fixed-line telephony |  |  |  |  |  |  |  |  |  |  |
Principal Transaction Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,607.8 | 1,599.8 | 2,149.5
Non-subscription revenue |  |  |  |  |  |  |  |  |  |  |
Principal Transaction Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 279.1 | 343.6 | 311.9
Total residential revenue |  |  |  |  |  |  |  |  |  |  |
Principal Transaction Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 9,655.0 | 9,316.4 | 11,795.1
Total residential mobile revenue |  |  |  |  |  |  |  |  |  |  |
Principal Transaction Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,678.3 | 1,606.8 | 1,694.7
Subscription revenue |  |  |  |  |  |  |  |  |  |  |
Principal Transaction Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 983.5 | 999.7 | 1,103.9
Non-subscription revenue |  |  |  |  |  |  |  |  |  |  |
Principal Transaction Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 694.8 | 607.1 | 590.8
Total B2B revenue |  |  |  |  |  |  |  |  |  |  |
Principal Transaction Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,983.5 | 1,740.1 | 1,854.2
Subscription revenue |  |  |  |  |  |  |  |  |  |  |
Principal Transaction Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 446.4 | 367.6 | 366.3
Non-subscription revenue |  |  |  |  |  |  |  |  |  |  |
Principal Transaction Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,537.1 | 1,372.5 | 1,487.9
Other revenue |  |  |  |  |  |  |  |  |  |  |
Principal Transaction Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 319.4 | $ 219.9 | $ 81.8

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