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Investments - Narratives (Details) € in Millions, $ in Millions, $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2021 EUR (€) | Mar. 31, 2021 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€) | Dec. 31, 2020 CAD ($) | Sep. 30, 2019
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |
Value of investment | $ 114.6 |  |  | $ 73.6 |  |  |
HTEC |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |
Value of investment |  |  | $ 20 |  |  | $ 20 |
McPhy |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |
Value of investment | 48.8 | € 41.6 |  | 53.8 | € 39.8 |  |
Stabilis Energy, Inc. |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |
Equity investment, cost | 10.0 |  |  | 4.1 |  |  |
Unrealized gain | 5.9 |  |  |  |  |  |
HTEC |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |
Value of investment | 15.8 |  |  | 15.7 |  |  |
Svante Inc. |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |
Value of investment | 15.0 |  |  |  |  |  |
Equity investment, cost | $ 15.0 |  |  |  |  |  |
Equity investments, ownership interest (percent) | 10.00% | 10.00% | 10.00% |  |  |  |
Transform Materials |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |
Value of investment | $ 25.0 |  |  |  |  |  |
Equity investments, ownership interest (percent) | 5.00% | 5.00% | 5.00% |  |  |  |
Liberty LNG |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |
Equity investments, ownership interest (percent) |  |  |  |  |  |  | 25.00%
(Decrease) increase in fair value of investments in equity securities | $ 2.2 |  |  | $ 2.1 |  |  |
Hudson Products de Mexico S.A. de CV | Investment in Joint Venture |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |
Equity investments, ownership interest (percent) |  |  |  | 50.00% | 50.00% | 50.00% |
(Decrease) increase in fair value of investments in equity securities | $ 2.8 |  |  | $ 2.8 |  |  |

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