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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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