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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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