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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Long-term investments (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Long-term investments |  |  |
Equity investments at FVOCI | $ 54.7 | $ 116.9 |
Gains (losses) in AOCI | (61.3) | (41.7) | $ (18.8)
Long-term Investments |  |  |
Long-term investments |  |  |
Gains (losses) in AOCI | (66.4) | (59.2) |
Investments in an accumulated gain position |  |  |
Long-term investments |  |  |
Equity investments at FVOCI | 39.0 | 55.0 |
Gains (losses) in AOCI | 0.3 | 3.2 |
Investments in an accumulated loss position |  |  |
Long-term investments |  |  |
Equity investments at FVOCI | 15.7 | 61.9 |
Gains (losses) in AOCI | (54.2) | (70.0) |
Net realized gains |  |  |
Long-term investments |  |  |
Gains (losses) in AOCI | $ (12.5) | $ 7.6 |

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