Investments (Equity Method Investments) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ (8.0)	$ (238.6)
nexfibre JV
Schedule of Equity Method Investments [Line Items]
Equity method investment	12.4	(8.6)
All3Media
Schedule of Equity Method Investments [Line Items]
Equity method investment	(10.1)	0.3
AtlasEdge JV
Schedule of Equity Method Investments [Line Items]
Equity method investment	(9.1)	(10.1)
VodafoneZiggo JV
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ 6.6	(35.7)
Percent of remaining results of operations included in investment	50.00%
Percent of interest income earned on loan included in investment	100.00%
Formula E
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ (4.5)	0.2
VMO2 JV
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ 0.7	(178.5)
Percent of remaining results of operations included in investment	50.00%
Percentage of share based compensation expense	100.00%
Other, net
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ (4.0)	$ (6.2)