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Investments - Co-Investment Agreement (Details) € in Millions		9 Months Ended
	Dec. 15, 2021 EUR (€)	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 07, 2021 USD ($)	Apr. 05, 2021 USD ($)	Apr. 05, 2021 EUR (€)
Debt and Equity Securities, FV-NI
Investments in equity securities		$ 90,600,000	$ 96,500,000
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
Capital Commitment Condition One \| Hydrogen Fund
Debt and Equity Securities, FV-NI
Aggregate capital commitments (percent)	15.00%
Capital Commitment Condition Two \| Hydrogen Fund
Debt and Equity Securities, FV-NI
Aggregate capital commitments (percent)	20.00%
Class A1 \| Capital Commitment Condition One \| Hydrogen Fund
Debt and Equity Securities, FV-NI
Investment interest (percent)	7.00%
Class A1 \| Capital Commitment Condition Two \| Hydrogen Fund
Debt and Equity Securities, FV-NI
Investment interest (percent)	6.50%
Class A1 \| Capital Commitment Condition Three \| Hydrogen Fund
Debt and Equity Securities, FV-NI
Investment interest (percent)	0.50%
Hy24
Debt and Equity Securities, FV-NI
Investments in equity securities		1,800,000	$ 900,000		$ 1,300,000	€ 1.2
Unfunded commitment					$ 48,800,000	€ 46.1
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%
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				$ 900.0
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%