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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Long-term investments (Details) - USD ($) $ in Millions | Dec. 09, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Long-term investments |  |  |  |
Equity investments at FVOCI |  | $ 126.2 | $ 155.9 |
Gains (losses) in AOCI |  | (20.4) | (98.5) | $ 21.1
Proceeds from sale | $ 113.2 |  |  |
Long-term Investments |  |  |  |
Long-term investments |  |  |  |
Gains (losses) in AOCI |  | (26.2) | (75.2) |
Investments in an accumulated gain position |  |  |  |
Long-term investments |  |  |  |
Equity investments at FVOCI |  | 79.8 | 76.1 |
Gains (losses) in AOCI |  | 10.3 | 4.5 |
Investments in an accumulated loss position |  |  |  |
Long-term investments |  |  |  |
Equity investments at FVOCI |  | 46.4 | 79.8 |
Gains (losses) in AOCI |  | $ (36.5) | (78.7) |
Net realized gains (losses) |  |  |  |
Long-term investments |  |  |  |
Gains (losses) in AOCI |  |  | $ (1.0) |

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