Investments (Equity Method Investments) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ (264.6)	$ (24.6)	$ (412.6)	$ (31.6)
VMO2 JV
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ (161.1)	3.0	$ (247.7)	3.7
Percent of remaining results of operations included in investment	50.00%		50.00%
Percentage of share based compensation expense	100.00%		100.00%
VodafoneZiggo JV
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ (48.1)	4.8	$ (70.7)	11.4
Percent of remaining results of operations included in investment	50.00%		50.00%
Percent of interest income earned on loan included in investment	100.00%		100.00%
nexfibre JV
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ (29.6)	(0.7)	$ (42.2)	11.7
AtlasEdge JV
Schedule of Equity Method Investments [Line Items]
Equity method investment	(18.5)	(4.7)	(34.5)	(13.8)
Formula E
Schedule of Equity Method Investments [Line Items]
Equity method investment	0.0	(18.8)	0.0	(23.3)
All3Media Ltd. (All3Media)
Schedule of Equity Method Investments [Line Items]
Equity method investment	0.0	(5.4)	0.0	(15.5)
Other, net
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ (7.3)	$ (2.8)	$ (17.5)	$ (5.8)

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