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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