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Investments (Schedule of Investments) (Details) $ in Millions, € in Billions	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2022 EUR (€)	Jun. 01, 2021
Schedule of Investments [Line Items]
Equity	$ 12,677.1	$ 16,945.2
Short-term, separately-managed accounts (SMAs)	2,621.6	2,269.6
Total investments	4,800.6	5,027.4
Total investments	17,477.7	21,972.6
Short-term investments	2,621.6	2,269.6
Long-term investments	14,856.1	19,703.0
Loans to the VodafoneZiggo JV	$ 0.0	123.0	$ 122.7
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Other current assets (notes 4 and 7)			Other current assets (notes 4 and 7)
Accrued interest	$ 18.5	5.1
VMO2 JV
Schedule of Investments [Line Items]
Equity	9,790.9	13,774.7
Total investments	$ 40,300.0			€ 33.3
Ownership percentage	50.00%			50.00%	50.00%
VodafoneZiggo JV
Schedule of Investments [Line Items]
Equity	$ 2,345.8	2,572.4
Ownership percentage	50.00%			50.00%
VodafoneZiggo JV \| VodafoneZiggo JV Loan
Schedule of Investments [Line Items]
Excess of carrying amount over proportional share in investees net assets	$ 1,196.8	1,236.0
Related party note receivable rate	5.55%
Interest accrued	$ 53.8
VodafoneZiggo JV \| VodafoneZiggo JV Receivable I
Schedule of Investments [Line Items]
Related party note receivable	749.7	797.1
VodafoneZiggo JV \| VodafoneZiggo JV Receivable II
Schedule of Investments [Line Items]
Related party note receivable	222.7	236.7
Loans to the VodafoneZiggo JV		123.0
All3Media
Schedule of Investments [Line Items]
Equity	$ 143.9	143.7
Ownership percentage	50.00%			50.00%
AtlasEdge JV
Schedule of Investments [Line Items]
Equity	$ 122.2	163.7
Ownership percentage	47.50%			47.50%
Formula E
Schedule of Investments [Line Items]
Equity	$ 87.3	115.9
Ownership percentage	35.90%			35.90%
Other
Schedule of Investments [Line Items]
Equity	$ 187.0	174.8
Long-term investments at fair value	337.5	378.1
Televisa Univision
Schedule of Investments [Line Items]
Long-term	$ 385.5	385.5
Ownership percentage	6.30%			6.30%
ITV plc (ITV)
Schedule of Investments [Line Items]
Long-term	$ 362.4	596.3
Ownership percentage	9.90%			9.90%
Lacework, Inc. (Lacework)
Schedule of Investments [Line Items]
Long-term	$ 242.8	269.1
Ownership percentage	3.30%			3.30%
SMAs
Schedule of Investments [Line Items]
Long-term investments at fair value	$ 233.0	531.7
EdgeConneX
Schedule of Investments [Line Items]
Long-term investments at fair value	$ 183.8	138.7
Ownership percentage	5.20%			5.20%
Plume Design, Inc. (Plume)
Schedule of Investments [Line Items]
Long-term	$ 154.0	188.8
Ownership percentage	11.50%			11.50%
Pax8
Schedule of Investments [Line Items]
Long-term	$ 99.0	14.7
Ownership percentage	5.90%			5.90%
Aviatrix Systems, Inc. (Aviatrix)
Schedule of Investments [Line Items]
Long-term investments at fair value	$ 78.2	78.2
Ownership percentage	3.80%			3.80%
CANAL+ Polska S.A. (CANAL+ Polska)
Schedule of Investments [Line Items]
Long-term investments at fair value	$ 66.1	70.8
Ownership percentage	17.00%			17.00%
Lions Gate Entertainment Corp. (Lionsgate)
Schedule of Investments [Line Items]
Long-term	$ 36.7	$ 105.9
Ownership percentage	2.90%			2.90%