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Investments - Investments in Equity Securities Narratives (Details) € in Millions, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Mar. 31, 2022 USD ($) | Apr. 05, 2021 EUR (€)
Debt and Equity Securities, FV-NI |  |  |  |
Investments in equity securities | $ 94.6 | $ 96.5 |  |
Increase (decrease) in equity securities | (2.0) |  |  |
Payments to acquire equity interest | 12.4 |  |  |
McPhy |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |
Investments in equity securities | 17.9 | 17.2 |  |
Increase (decrease) in equity securities | 0.5 |  | $ (3.7) |
Stabilis Energy, Inc. |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |
Investments in equity securities | 5.3 | 7.8 |  |
Increase (decrease) in equity securities | (2.5) |  | $ 1.1 |
Transform Materials |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |
Investments in equity securities | 25.1 | 25.1 |  |
Svante Inc. |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |
Investments in equity securities | 38.5 | 38.5 |  |
Hy24 |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |
Investments in equity securities | 0.8 | 0.9 |  | € 0.7
Gold Hydrogen LLC |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |
Investments in equity securities | 2.0 | 2.0 |  |
Avina |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |
Investments in equity securities | $ 5.0 | 5.0 |  |
New investments |  | $ 5.0 |  |

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