v3.10.0.1

Investments (Schedules) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investment [Line Items]
Equity	$ 3,947.0	$ 4,324.6
Fair value	1,174.8	2,315.3
Cost	0.0	31.5
Total	5,121.8	6,671.4
Share of results of affiliates, net	(8.7)	(95.2)	$ (111.6)
VodafoneZiggo JV
Investment [Line Items]
Equity	3,761.5	4,162.8
Share of results of affiliates, net	11.4	(70.1)	0.0
Summarized Financial Condition
Revenue	4,602.2	4,512.5	0.0
Loss before income taxes	(467.8)	(362.9)
Net loss	(91.6)	(259.3)
Current assets	1,099.6	823.4
Total assets	22,155.7	24,076.8
Total assets	23,255.3	24,900.2
Current liabilities	2,812.3	2,631.7
Long-term liabilities	14,751.5	16,110.4
Owners’ / Partners' equity	5,691.5	6,158.1
Total liabilities and owners’ equity	23,255.3	24,900.2
Other
Investment [Line Items]
Equity	185.5	161.8
Fair value	298.2	244.7
Share of results of affiliates, net	(20.1)	(25.1)	(111.6)
ITV plc (ITV) — subject to re-use rights
Investment [Line Items]
Fair value	634.2	892.0
ITI Neovision S.A. (ITI Neovision)
Investment [Line Items]
Fair value	125.4	161.9
Lions Gate Entertainment Corp (Lionsgate)
Investment [Line Items]
Fair value	77.5	163.9
Casa Systems, Inc. (Casa)
Investment [Line Items]
Fair value	39.5	76.3
Sumitomo Corporation (Sumitomo)
Investment [Line Items]
Fair value	0.0	776.5
All3Media
Summarized Financial Condition
Revenue	892.3	769.8	649.1
Loss before income taxes	(46.8)	(49.3)	(96.6)
Net loss	(58.6)	(51.6)	$ (91.0)
Current assets	532.6	409.4
Total assets	681.0	748.0
Total assets	1,213.6	1,157.4
Current liabilities	458.0	389.1
Long-term liabilities	766.2	718.8
Owners’ / Partners' equity	2.7	46.6
Noncontrolling interests	(13.3)	2.9
Total liabilities and owners’ equity	$ 1,213.6	$ 1,157.4

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