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Investments (Equity Method Investments) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ 230.5	$ 1.7
Revenue	1,853.3	3,499.9
Earnings before income taxes	1,156.9	1,587.9
Net earnings	1,110.3	1,440.3
VMO2 JV
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ 187.1	0.0
Percent of remaining results of operations included in investment	50.00%
Percentage of share based compensation expense	100.00%
VMO2 JV | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Revenue	$ 3,398.0
Earnings before income taxes	378.6
Net earnings	318.1
VodafoneZiggo JV
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ 48.6	4.7
Percent of remaining results of operations included in investment	50.00%
Percent of interest income earned on loan included in investment	100.00%
VodafoneZiggo JV | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Revenue	$ 1,130.0	1,217.0
Earnings before income taxes	127.0	(21.4)
Net earnings	72.3	(16.1)
All3Media Group (All3Media)
Schedule of Equity Method Investments [Line Items]
Equity method investment	(4.7)	(9.0)
Formula E
Schedule of Equity Method Investments [Line Items]
Equity method investment	7.9	8.7
Other, net
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ (8.4)	$ (2.7)

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