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Amount of funds committed to investment company from investors.

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Indicates type of investment. Includes, but is not limited to, common stock, preferred stock, convertible security, fixed income security, government security, option purchased, warrant, loan participation and assignment, commercial paper, bankers' acceptance, certificates of deposit, short-term security, repurchase agreement, and other investment company.

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Investments - Narratives (Details) € in Millions			12 Months Ended
Investments - Narratives (Details) € in Millions	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%