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Investments - Narratives (Details) € in Millions | Dec. 15, 2021 | Dec. 31, 2022 USD ($) | Dec. 31, 2022 EUR (€) | May 04, 2022 EUR (€) | Mar. 31, 2022 USD ($) | Mar. 31, 2022 EUR (€) | Dec. 31, 2021 USD ($) | Sep. 07, 2021 USD ($) | Apr. 05, 2021 EUR (€) | Dec. 31, 2020 USD ($)
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Debt and Equity Securities, FV-NI |  |  |  |  |  |  |  |  |  |
Investments in equity securities | $ |  | $ 96,500,000 |  |  |  |  | $ 77,800,000 |  |  | $ 73,600,000
Hy24 |  |  |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |  |  |  |
Assets under management, carrying amount | € |  |  |  |  |  |  |  |  | € 114,000.0 |
Hydrogen Fund |  |  |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |  |  |  |
Investment term (in years) | 12 years |  |  |  |  |  |  |  |  |
Hy24 |  |  |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |  |  |  |
Investments in equity securities |  | $ 900,000 | € 0.9 | € 0.9 | $ 2,400,000 | € 2.2 |  |  |  |
Unfunded commitments | € |  |  |  |  |  |  |  |  | € 49.1 |
Hydrogen Fund | Capital Commitment Condition One |  |  |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |  |  |  |
Aggregate capital commitments (in percent) | 15.00% |  |  |  |  |  |  |  |  |
Hydrogen Fund | Capital Commitment Condition Two |  |  |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |  |  |  |
Aggregate capital commitments (in percent) | 20.00% |  |  |  |  |  |  |  |  |
Hydrogen Fund | Class A1 | Capital Commitment Condition One |  |  |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |  |  |  |
Investment interest rate | 7.00% |  |  |  |  |  |  |  |  |
Hydrogen Fund | Class A1 | Capital Commitment Condition Two |  |  |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |  |  |  |
Investment interest rate | 6.50% |  |  |  |  |  |  |  |  |
Corporate Joint Venture | HTEC | Common Stock |  |  |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |  |  |  |
Right of refusal compensation percentage (percent) |  |  |  |  |  |  |  | 102.00% |  |
Anniversary Period One | Corporate Joint Venture | HTEC |  |  |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |  |  |  |
Put option internal rate of return (percent) |  |  |  |  |  |  |  | 10.00% |  |
Anniversary Period One | Corporate Joint Venture | HTEC | Common Stock |  |  |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |  |  |  |
Invested capital multiple rate |  |  |  |  |  |  |  | 1.65 |  |
Anniversary Period One | Squared Capital | Corporate Joint Venture |  |  |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |  |  |  |
Shareholder distribution threshold | $ |  |  |  |  |  |  |  | $ 900,000,000.0 |  |
Anniversary Period Two | Corporate Joint Venture | HTEC |  |  |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |  |  |  |
Put option internal rate of return (percent) |  |  |  |  |  |  |  | 12.50% |  |
Anniversary Period Two | Corporate Joint Venture | HTEC | Common Stock |  |  |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |  |  |  |
Percentage of shares callable upon exercise of call option (percent) |  |  |  |  |  |  |  | 20.00% |  |

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