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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Long-term investments (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Long-term investments |  |  |
Fair value | $ 188.0 | $ 142.9 |
Gains (losses) in AOCI | 21.1 | 39.1 | $ (31.3)
Long-term Investments |  |  |
Long-term investments |  |  |
Fair value | 188.0 | 142.9 |
Gains (losses) in AOCI | 6.9 | 23.6 |
Investments in an unrealized gain position |  |  |
Long-term investments |  |  |
Fair value | 125.1 | 110.2 |
Gains (losses) in AOCI | 26.6 | 30.3 |
Investments in an unrealized loss position |  |  |
Long-term investments |  |  |
Fair value | 62.9 | 32.7 |
Gains (losses) in AOCI | $ (19.7) | $ (6.7) |

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