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Investments (Details-4) - ATC [Member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Related party transaction [Line Items] |  |  |
Related party expenses | $ 30.4 | $ 29.0 | $ 29.2
Due from Related Parties | $ 1.6 | $ 0.1 |

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