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Equity Method Investment, Leverage Ratio

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Amount, after allowance for credit loss, of accrued interest on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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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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Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

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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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Carrying amount of equity interests owned by noncontrolling shareholders, partners, or other equity holders in one or more of the entities consolidated into the reporting entity's financial statements other than joint ventures, limited partnerships, operating partnerships or interests held by preferred unit holders.

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The cash outflow from advancing money to an affiliate (an entity that is related but not strictly controlled by the entity).

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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, 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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Investments (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
Investments (Narrative) (Details) - USD ($)	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 01, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Loans to the VodafoneZiggo JV			$ 123,000,000.0	$ 122,700,000
Accrued interest	$ 5,700,000		5,700,000			$ 7,100,000
Revenue	1,901,400,000	$ 2,845,400,000	8,390,500,000	8,233,700,000
Proceeds from sale of debt securities	1,900,000,000	1,300,000,000	4,800,000,000	3,800,000,000
Realized gain (losses)	0	100,000	(1,600,000)	800,000
Third-Party Purchaser
Schedule of Investments [Line Items]
Noncontrolling interests	$ 9,600,000		$ 9,600,000			9,700,000
VodafoneZiggo JV
Schedule of Investments [Line Items]
Percent of interest income earned on loan included in investment	100.00%		100.00%
Co-venturer ownership percentage	50.00%		50.00%
Ownership percentage	50.00%		50.00%
Dividends received from the VodafoneZiggo JV			$ 240,900,000	102,000,000
JV Services
Schedule of Investments [Line Items]
Revenue	$ 45,200,000	$ 47,200,000	$ 161,000,000	$ 135,300,000
VMED O2 JV
Schedule of Investments [Line Items]
Co-venturer ownership percentage					50.00%
Ownership percentage	50.00%		50.00%		50.00%
Due from related party	$ 52,000,000		$ 52,000,000
VMED O2 JV \| Liberty Global
Schedule of Investments [Line Items]
Co-venturer ownership percentage					50.00%
VMED O2 JV \| Telefonica
Schedule of Investments [Line Items]
Co-venturer ownership percentage					50.00%
UK JV Services
Schedule of Investments [Line Items]
Revenue	69,700,000		93,900,000
Minimum \| VMED O2 JV
Schedule of Investments [Line Items]
Leverage ratio					4.0
Maximum \| VMED O2 JV
Schedule of Investments [Line Items]
Leverage ratio					5.0
VodafoneZiggo JV Loan \| VodafoneZiggo JV
Schedule of Investments [Line Items]
Excess of carrying amount over proportional share in investees net assets	1,247,000,000		$ 1,247,000,000			1,198,500,000
Related party note receivable rate			5.55%
Interest accrued			$ 41,700,000
VodafoneZiggo JV Receivable I \| VodafoneZiggo JV
Schedule of Investments [Line Items]
Related party note receivable	809,900,000		809,900,000			855,800,000
VodafoneZiggo JV Receivable II \| VodafoneZiggo JV
Schedule of Investments [Line Items]
Related party note receivable	240,500,000		240,500,000			127,100,000
Loans to the VodafoneZiggo JV	123,000,000
Equity Method Investee \| VodafoneZiggo JV
Schedule of Investments [Line Items]
Due from related party	$ 51,300,000		$ 51,300,000			$ 27,400,000