Equity Method Investment, Put Option Internal Rate of Return, Percentage

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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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Investment Company Maximum Capital Call, Percent

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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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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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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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Amount of funds committed to investment company from investors.

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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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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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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 - Co-Investment Agreement (Details) € in Millions		3 Months Ended
	Dec. 15, 2021 EUR (€)	Mar. 31, 2022 USD ($)	Mar. 31, 2022 EUR (€)	Dec. 31, 2021 USD ($)	Sep. 07, 2021 USD ($)
Debt and Equity Securities, FV-NI
Payments to acquire equity interest		$ 3,400,000
Equity method investments		100,900,000		$ 99,600,000
Investments in equity securities		78,000,000.0		$ 77,800,000
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%
Class A1 \| Hydrogen Fund \| Capital Commitment Condition One
Debt and Equity Securities, FV-NI
Investment Interest Rate	7.00%
Class A1 \| Hydrogen Fund \| Capital Commitment Condition Two
Debt and Equity Securities, FV-NI
Investment Interest Rate	6.50%
Corporate Joint Venture \| Closing through third anniversary \| ISQ
Debt and Equity Securities, FV-NI
Shareholder distribution threshold					$ 900,000,000.0
HTEC \| Corporate Joint Venture \| Common Stock
Debt and Equity Securities, FV-NI
Right of refusal compensation percentage (percent)					102.00%
HTEC \| Corporate Joint Venture \| Closing through third anniversary
Debt and Equity Securities, FV-NI
Put option internal rate of return (percent)					10.00%
HTEC \| Corporate Joint Venture \| Closing through third anniversary \| Common Stock
Debt and Equity Securities, FV-NI
Invested capital multiple rate					1.65
HTEC \| Corporate Joint Venture \| After third anniversary
Debt and Equity Securities, FV-NI
Put option internal rate of return (percent)					12.50%
HTEC \| Corporate Joint Venture \| After third anniversary \| Common Stock
Debt and Equity Securities, FV-NI
Percentage of shares callable upon exercise of call option (percent)					20.00%
Clean H2 Infra Fund
Debt and Equity Securities, FV-NI
Unfunded commitment \| €			€ 47.8
Investments in equity securities		$ 2,400,000	€ 2.2
Hydrogen Fund
Debt and Equity Securities, FV-NI
Aggregate capital commitments \| €	€ 1,500.0
Investment term (in years)	12 years
Maximum capital call, (in percent)	30.00%
Hydrogen Fund \| Maximum
Debt and Equity Securities, FV-NI
Aggregate capital commitments \| €	€ 1,800.0