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Investments (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
VodafoneZiggo JV
Schedule of Investments [Line Items]
Percent of interest income earned on loan included in investment	100.00%
Percent of remaining results of operations included in investment	50.00%
Revenue	$ 1,093,900,000	$ 1,196,600,000
JV Services
Schedule of Investments [Line Items]
Revenue	28,000,000.0	34,500,000
VodafoneZiggo JV Loan | VodafoneZiggo JV
Schedule of Investments [Line Items]
Due from related party	$ 910,100,000		$ 916,100,000
Receivable interest rate	5.55%
Accrued interests settled in cash	$ 12,600,000
Equity Method Investee | VodafoneZiggo JV
Schedule of Investments [Line Items]
Transfer of assets	3,900,000	$ 9,900,000
Due from related party	$ 20,400,000		$ 24,400,000

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