Investments (Equity Method Investments) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ (238.6)	$ 230.5
Revenue	1,868.4	1,853.3
Earnings (loss) before income taxes	(701.0)	1,156.9
Net earnings (loss)	(713.5)	1,110.3
VMO2 JV
Schedule of Equity Method Investments [Line Items]
Revenue	3,162.7	3,398.0
Earnings (loss) before income taxes	(454.0)	378.6
Net earnings (loss)	(352.1)	318.1
VodafoneZiggo JV
Schedule of Equity Method Investments [Line Items]
Earnings (loss) before income taxes	(108.9)	127.0
Net earnings (loss)	(88.1)	72.3
VMO2 JV
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ (178.5)	187.1
Percent of remaining results of operations included in investment	50.00%
Percentage of share based compensation expense	100.00%
Revenue	$ 3,162.7
VodafoneZiggo JV
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ (35.7)	48.6
Percent of remaining results of operations included in investment	50.00%
Percent of interest income earned on loan included in investment	100.00%
Revenue	$ 1,083.4	1,130.0
AtlasEdge JV
Schedule of Equity Method Investments [Line Items]
Equity method investment	(10.1)	(3.0)
nexfibre JV
Schedule of Equity Method Investments [Line Items]
Equity method investment	(8.6)	0.0
Other, net
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ (5.7)	$ (2.2)