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First Right Of Refusal Compensation Rate Relative To Third Party

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Invested Capital Multiple

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Percentage Shares Callable

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Potential Extension Term

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Shareholder Distribution Threshold

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The carrying amount of assets an investment adviser manages on behalf of investors.

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- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).

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Percentage of capital contributed to capital committed by investment company's investors.

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Rate of interest on investment.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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 ($)
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%