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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Long-term investments (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Long-term investments |  |  |
Equity investments at FVOCI | $ 155.9 | $ 188.0 |
Gains (losses) in AOCI | (98.5) | 21.1 | $ 39.1
Long-term Investments |  |  |
Long-term investments |  |  |
Equity investments at FVOCI | 155.9 | 188.0 |
Gains (losses) in AOCI | (75.2) | 6.9 |
Investments in an unrealized gain position |  |  |
Long-term investments |  |  |
Equity investments at FVOCI | 76.1 | 125.1 |
Gains (losses) in AOCI | 5.1 | 26.6 |
Investments in an unrealized loss position |  |  |
Long-term investments |  |  |
Equity investments at FVOCI | 79.8 | 62.9 |
Gains (losses) in AOCI | $ (80.3) | $ (19.7) |

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