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Investments (Schedules) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Investment [Line Items] |  |  |
Equity | $ 3,827.3 |  | $ 3,947.0
Fair value | 1,187.1 |  | 1,174.8
Total | 5,014.4 |  | 5,121.8
Share of results of affiliates, net | (70.9) | $ (36.5) |
VodafoneZiggo JV |  |  |
Investment [Line Items] |  |  |
Equity | 3,624.1 |  | 3,761.5
Share of results of affiliates, net | (62.3) | (26.8) |
Summarized results of operations of the VodafoneZiggo JV |  |  |
Revenue | 1,093.9 | 1,196.6 |
Loss before income taxes | (188.8) | (103.7) |
Net loss | (150.3) | (76.2) |
Other |  |  |
Investment [Line Items] |  |  |
Equity | 203.2 |  | 185.5
Fair value | 310.7 |  | 298.2
Share of results of affiliates, net | (8.6) | $ (9.7) |
ITV plc (ITV) — subject to re-use rights |  |  |
Investment [Line Items] |  |  |
Fair value | 658.1 |  | 634.2
ITI Neovision S.A. (ITI Neovision) |  |  |
Investment [Line Items] |  |  |
Fair value | 118.1 |  | 125.4
Lions Gate Entertainment Corp (Lionsgate) |  |  |
Investment [Line Items] |  |  |
Fair value | 76.9 |  | 77.5
Casa Systems, Inc. (Casa) |  |  |
Investment [Line Items] |  |  |
Fair value | $ 23.3 |  | $ 39.5

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