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Investments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Jun. 01, 2021
Schedule of Investments [Line Items]
Revenue	$ 1,853.3	$ 3,499.9
Proceeds from sale of debt securities	2,600.0	1,500.0
Realized net losses	$ (3.4)	(1.3)
VMO2 JV
Schedule of Investments [Line Items]
Co-venturer ownership percentage	50.00%
Ownership percentage	50.00%			50.00%
Due from related party	$ 35.0		$ 43.3
VMO2 JV | Telefonica
Schedule of Investments [Line Items]
Co-venturer ownership percentage				50.00%
VMO2 JV | Liberty Global
Schedule of Investments [Line Items]
Co-venturer ownership percentage				50.00%
UK JV Services
Schedule of Investments [Line Items]
Revenue	68.7
JV Services
Schedule of Investments [Line Items]
Revenue	$ 60.0	$ 50.7
VodafoneZiggo JV
Schedule of Investments [Line Items]
Co-venturer ownership percentage	50.00%
Ownership percentage	50.00%
Return of capital	$ 94.8
VodafoneZiggo JV | Equity Method Investee
Schedule of Investments [Line Items]
Due from related party	$ 37.0		$ 62.5

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