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Investments - Investments in Equity Securities Narrative (Details) € in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Apr. 05, 2021 USD ($) | Apr. 05, 2021 EUR (€)
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |
Investments in equity securities |  | $ 96.5 | $ 91.2 | $ 96.5 | $ 77.8 |  |
Decrease in fair value of investments in equity securities |  |  | (14.4) | 13.1 |  |  |
Payments to acquire equity securities |  |  | 8.7 | 9.4 |  |  |
McPhy |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |
Investments in equity securities |  | 17.2 | 4.8 | 17.2 |  |  |
Decrease in fair value of investments in equity securities |  |  | (12.7) | (11.8) | (19.7) |  |
Stabilis Energy, Inc. |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |
Investments in equity securities |  | 7.8 | 6.1 | 7.8 |  |  |
Decrease in fair value of investments in equity securities |  |  | (1.7) | 1.6 | $ 2.2 |  |
Transform Materials |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |
Investments in equity securities |  | 25.1 | 25.1 | 25.1 |  |  |
Svante Inc. |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |
Investments in equity securities |  |  | 38.5 |  |  |  |
Hy24 |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |
Investments in equity securities |  | 0.9 | 4.1 | 0.9 |  | $ 3.4 | € 3.2
Cemvita Factory Inc., Gold Hydrogen LLC |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |
Investments in equity securities |  | 2.0 | 2.0 | 2.0 |  |  |
Avina Clean Hydrogen Inc. |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |
Investments in equity securities |  | 10.0 | $ 10.0 | $ 10.0 |  |  |
Payments to acquire equity securities | $ 5.0 | $ 5.0 |  |  |  |  |

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