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Investments (Schedules) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investment [Line Items]
Equity	$ 3,492.8				$ 3,947.0				$ 3,492.8	$ 3,947.0
Fair value	1,289.2				1,174.8				1,289.2	1,174.8
Total	4,782.0				5,121.8				4,782.0	5,121.8
Realized and unrealized gains (losses) due to changes in fair values of certain investments, net									99.0	(393.2)	$ 228.1
Share of results of affiliates, net									(198.5)	(8.7)	(95.2)
Summarized Financial Condition
Revenue	2,982.2	$ 2,840.9	$ 2,850.4	$ 2,868.0	2,949.1	$ 2,929.7	$ 3,015.6	$ 3,063.5	11,541.5	11,957.9	11,276.4
VodafoneZiggo JV
Investment [Line Items]
Equity	3,174.1				3,761.5				3,174.1	3,761.5
Share of results of affiliates, net									(185.9)	11.4	(70.1)
Summarized Financial Condition
Revenue									4,407.8	4,602.2	4,512.5
Loss before income taxes									(512.5)	(467.8)	(362.9)
Net loss									(470.0)	(91.6)	(259.3)
Current assets	918.4				1,099.6				918.4	1,099.6
Total assets	21,508.1				22,155.7				21,508.1	22,155.7
Total assets	22,426.5				23,255.3				22,426.5	23,255.3
Current liabilities	2,726.4				2,812.3				2,726.4	2,812.3
Long-term liabilities	14,920.7				14,751.5				14,920.7	14,751.5
Long-term liabilities	4,779.4				5,691.5				4,779.4	5,691.5
Total liabilities and owners’ equity	22,426.5				23,255.3				22,426.5	23,255.3
All3Media Group (All3Media)
Investment [Line Items]
Equity	172.8				72.2				172.8	72.2
Share of results of affiliates, net									(8.8)	(19.2)	(25.5)
Formula E Holdings Ltd (Formula E)
Investment [Line Items]
Equity	105.2				45.4				105.2	45.4
Share of results of affiliates, net									1.7	(0.2)	(1.5)
Other
Investment [Line Items]
Equity	40.7				67.9				40.7	67.9
Fair value	297.6				298.2				297.6	298.2
Realized and unrealized gains (losses) due to changes in fair values of certain investments, net									(18.4)	(11.5)	14.4
Share of results of affiliates, net									(5.5)	(0.7)	1.9
ITV plc (ITV) — subject to re-use rights
Investment [Line Items]
Fair value	798.1				634.2				798.1	634.2
Realized and unrealized gains (losses) due to changes in fair values of certain investments, net									163.9	(257.8)	(123.5)
ITI Neovision S.A. (ITI Neovision)
Investment [Line Items]
Fair value	122.4				125.4				122.4	125.4
Realized and unrealized gains (losses) due to changes in fair values of certain investments, net									2.7	(24.9)	15.8
Lions Gate Entertainment Corp (Lionsgate)
Investment [Line Items]
Fair value	68.0				77.5				68.0	77.5
Realized and unrealized gains (losses) due to changes in fair values of certain investments, net									(25.0)	(86.4)	35.3
Casa Systems, Inc. (Casa)
Investment [Line Items]
Fair value	$ 3.1				$ 39.5				3.1	39.5
Realized and unrealized gains (losses) due to changes in fair values of certain investments, net									(24.2)	(9.2)	47.9
Sumitomo
Investment [Line Items]
Realized and unrealized gains (losses) due to changes in fair values of certain investments, net									$ 0.0	$ (3.4)	$ 238.2

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