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Investments - Narratives (Details) € in Millions |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 15, 2021 | Apr. 05, 2021 EUR (€) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Sep. 07, 2021 USD ($) | Apr. 05, 2021 USD ($) member | Apr. 05, 2021 EUR (€) member
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |  |
Investments in equity securities |  |  | $ 91,200,000 | $ 96,500,000 | $ 77,800,000 |  |  |
Capital Commitment Condition One |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |  |
Aggregate capital commitments (in percent) |  | 15.00% |  |  |  |  |  |
Investment, Type [Extensible Enumeration] |  |  |  |  |  |  | Common Stock | Common Stock
Capital Commitment Condition Two |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |  |
Aggregate capital commitments (in percent) |  | 20.00% |  |  |  |  |  |
Hydrogen Fund |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |  |
Investment term (in years) | 12 years |  |  |  |  |  |  |
Hydrogen Fund | Maximum |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |  |
Aggregate capital commitments | € |  | € 1,800.0 |  |  |  |  |  |
Class A1 | Capital Commitment Condition One |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |  |
Investment interest rate |  |  |  |  |  |  | 7.00% | 7.00%
Class A1 | Capital Commitment Condition Two |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |  |
Investment interest rate |  |  |  |  |  |  | 6.50% | 6.50%
Class A1 | Capital Commitment Condition Three |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |  |
Investment interest rate | 0.50% |  |  |  |  |  |  |
Hy24 |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |  |  |
Investments in equity securities |  |  | 4,100,000 | $ 900,000 |  |  | $ 3,400,000 | € 3.2
Unfunded commitments |  |  |  |  |  |  | $ 48,700,000 | € 44.1
Number of investors (member) | member |  |  |  |  |  |  | 15 | 15
Dividend received from equity method investment |  |  | $ 300,000 |  |  |  |  |
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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