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Investments - Co-Investment Agreement (Details) € in Millions | Dec. 15, 2021 EUR (€) | Jun. 30, 2022 USD ($) | Jun. 30, 2022 EUR (€) | Dec. 31, 2021 USD ($) | Sep. 07, 2021 USD ($)
--- | --- | --- | --- | --- | ---
Debt and Equity Securities, FV-NI |  |  |  |  |
Investments in equity securities | $ |  | $ 66,200,000 |  | $ 77,800,000 |
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 |  |  |  |
Hy24 |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Management assets |  |  | € 114,000.0 |  |
Capital Commitment Condition One | Hydrogen Fund |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Aggregate capital commitments (in percent) | 15.00% |  |  |  |
Capital Commitment Condition Two | Hydrogen Fund |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Aggregate capital commitments (in percent) | 20.00% |  |  |  |
Hy24 |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Unfunded commitment |  |  | 48.0 |  |
Class A1 | Capital Commitment Condition One | Hydrogen Fund |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Investment Interest Rate | 7.00% |  |  |  |
Class A1 | Capital Commitment Condition Two | Hydrogen Fund |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Investment Interest Rate | 6.50% |  |  |  |
Hy24 |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Investments in equity securities |  | $ 2,000,000.0 | € 2.0 |  |
Corporate Joint Venture | HTEC | Common Stock |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Right of refusal compensation percentage (percent) |  |  |  |  | 102.00%
Closing through third anniversary | Corporate Joint Venture | HTEC |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Put option internal rate of return (percent) |  |  |  |  | 10.00%
Closing through third anniversary | Corporate Joint Venture | HTEC | Common Stock |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Invested capital multiple rate |  |  |  |  | 1.65
Closing through third anniversary | ISQ | Corporate Joint Venture |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Shareholder distribution threshold | $ |  |  |  |  | $ 900,000,000.0
After third anniversary | Corporate Joint Venture | HTEC |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Put option internal rate of return (percent) |  |  |  |  | 12.50%
After third anniversary | 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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