Equity Method Investment, Co-Venturer Ownership Percentage

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Payments of Value-Added Taxes, Joint Venture

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- Definition

Percent of Interest Income Earned on Loan Included in Income (Loss) from Equity Method Investments

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Percent of Remaining Results of Operations Included in Income (Loss) from Equity Method Investments

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Percent of Share-based Compensation Included in Income (Loss) from Equity Method Investments

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Proceeds from Equalization Payment from Affiliate

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- Definition

Proceeds from Joint Venture Debt Financing Arrangements

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- Definition

Receivable with Imputed Interest, Net Amount, Receivable in Year One

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Receivable with Imputed Interest, Net Amount, Receivable in Year Three

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Receivable with Imputed Interest, Net Amount, Receivable in Year Two

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- Definition

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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- Definition

Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The increase (decrease) during the reporting period in the amount due from borrowers for interest payments.

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Yield on the receivable, on which interest has been imputed, as calculated from its issuance value or purchase price. The calculated effective interest rate considers factors such as the issued face value or price paid for the receivable, the time period between payments, and the time until maturity [full receipt] of the receivable.

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The principal amount of the receivable or note before consideration of the discount or premium.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Investments (Narrative) (Details) € in Millions			3 Months Ended
Investments (Narrative) (Details) € in Millions	Jan. 04, 2017 EUR (€)	Jan. 04, 2017 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2017 EUR (€)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2018 EUR (€)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016
Schedule of Investments [Line Items]
Value-added taxes (VAT) paid on behalf of the VodafoneZiggo JV			$ 0			$ 162,600,000
Revenue			4,156,100,000			3,519,000,000.0
VodafoneZiggo JV [Member]
Schedule of Investments [Line Items]
Percent of interest income earned on loan included in investment							100.00%	100.00%
Percent of share-based compensation included in investment							100.00%	100.00%
Percent of remaining results of operations included in investment							50.00%	50.00%
Ownership percentage							50.00%	50.00%	50.00%	50.00%
Co-venturer ownership percentage										50.00%
Dividends from affiliates and others	€ 2,200.0	$ 2,400,000,000		€ 3.9	$ 4,500,000
JV Services [Member]
Schedule of Investments [Line Items]
Revenue			$ 34,500,000			$ 31,500,000
VodafoneZiggo JV Loan [Member] \| VodafoneZiggo JV [Member]
Schedule of Investments [Line Items]
Due from related party								$ 1,106,200,000	$ 1,081,900,000
Receivable interest rate			5.55%
Receivable in year one							€ 100.0	122,900,000
Receivable in year two							100.0	122,900,000
Receivable in year three							€ 100.0	122,900,000
Accrued interests settled in cash			$ 15,200,000
Vodafone [Member]
Schedule of Investments [Line Items]
Proceeds from financing arrangements	2,800.0	2,900,000,000
Proceeds from equalization payment from affiliate	€ 802.9	$ 840,800,000
Equity Method Investee [Member] \| VodafoneZiggo JV [Member]
Schedule of Investments [Line Items]
Due from related party								$ 65,900,000	$ 33,300,000