Investments (Equity Method Investments) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ (148.0)	$ (7.0)
VMO2 JV
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ (86.6)	0.7
Percent of remaining results of operations included in investment	50.00%
Percentage of share based compensation expense	100.00%
VodafoneZiggo JV
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ (22.6)	6.6
Percent of remaining results of operations included in investment	50.00%
Percent of interest income earned on loan included in investment	100.00%
AtlasEdge JV
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ (16.0)	(9.1)
nexfibre JV
Schedule of Equity Method Investments [Line Items]
Equity method investment	(12.6)	12.4
Formula E
Schedule of Equity Method Investments [Line Items]
Equity method investment	0.0	(4.5)
All3Media Ltd. (All3Media)
Schedule of Equity Method Investments [Line Items]
Equity method investment	0.0	(10.1)
Other, net
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ (10.2)	$ (3.0)