Investments - Narratives (Details) € / shares in Units, $ / shares in Units, $ / shares in Units, € in Millions, $ in Millions					3 Months Ended					12 Months Ended
		Dec. 15, 2021 EUR (€) € / shares shares	Sep. 07, 2021 USD ($)	Sep. 07, 2021 CAD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2021 EUR (€)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) shares	Dec. 31, 2020 CAD ($)	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($)	Sep. 07, 2021 $ / shares
Debt and Equity Securities, FV-NI
Equity investments, carrying value								$ 5,300,000		$ 99,600,000	$ 5,300,000
Equity in earnings of unconsolidated affiliates, net										300,000	0	$ 0
New investments										45,200,000	50,800,000
Unrealized (loss) gain on investment										3,200,000	14,100,000
Payments to acquire investments	[1]									103,900,000	50,800,000	3,300,000
Investments in equity securities								$ 73,600,000		$ 77,800,000	73,600,000	6,900,000
Share price (usd per share) | $ / shares										$ 159.49
Realized gain on investment in equity securities										$ 2,600,000	$ 0	0
Common stock, shares issued (shares) | shares								36,185,829		36,548,330	36,185,829
Hydrogen Fund
Debt and Equity Securities, FV-NI
Equity investments, carrying value | €		€ 50.0
Commit to invest | €		€ 100.0
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%
Nonconsolidated Investee or Group of Investees
Debt and Equity Securities, FV-NI
Equity investments, carrying value								$ 5,300,000		$ 99,600,000	$ 5,300,000	6,500,000
Equity in earnings of unconsolidated affiliates, net										400,000	(700,000)
New investments										58,700,000
Nonconsolidated Investee or Group of Investees | Other Investments
Debt and Equity Securities, FV-NI
Equity in earnings of unconsolidated affiliates, net										400,000
Class A1 | Hydrogen Fund
Debt and Equity Securities, FV-NI
Share price (usd per share) | € / shares		€ 100
Common stock, shares issued (shares) | shares		500,000
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%
HTEC
Debt and Equity Securities, FV-NI
Share price (usd per share) | $ / shares													$ 24.33
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
Investment in Equity Securities Level 1
Debt and Equity Securities, FV-NI
New investments										0	35,100,000
Unrealized (loss) gain on investment										(19,700,000)	17,000,000.0
Investments in equity securities								53,800,000		31,300,000	53,800,000	0
Realized gain on investment in equity securities										0
Level 2
Debt and Equity Securities, FV-NI
New investments										0	0
Unrealized (loss) gain on investment										2,200,000	(2,900,000)
Investments in equity securities								4,100,000		6,200,000	4,100,000	6,900,000
Realized gain on investment in equity securities										$ 0
Squared Capital | Corporate Joint Venture | Anniversary Period One
Debt and Equity Securities, FV-NI
Shareholder distribution threshold			$ 900,000,000.0
Hudson Products de Mexico S.A. de CV | Nonconsolidated Investee or Group of Investees
Debt and Equity Securities, FV-NI
Equity investments, ownership interest										50.00%
Equity investments, carrying value								2,800,000		$ 3,300,000	2,800,000
Equity in earnings of unconsolidated affiliates, net										500,000	300,000	200,000
McPhy
Debt and Equity Securities, FV-NI
Unrealized (loss) gain on investment										19,700,000	17,000,000.0
Investments in equity securities								53,800,000		31,300,000	53,800,000
Stabilis Energy, Inc.
Debt and Equity Securities, FV-NI
Unrealized (loss) gain on investment											2,900,000	100,000
Investments in equity securities								4,100,000		6,200,000	4,100,000
Earthly Labs Inc.
Debt and Equity Securities, FV-NI
Equity investments, ownership interest					15.00%	15.00%
Shares owned (shares)					15.00%	15.00%
Payments to acquire investments					$ 5,000,000.0
Realized gain on investment in equity securities										$ 2,600,000
Transform Materials
Debt and Equity Securities, FV-NI
Shares owned (shares)							5.00%
Payments to acquire investments							$ 25,100,000
Svante Inc.
Debt and Equity Securities, FV-NI
Shares owned (shares)							10.00%
Payments to acquire investments							$ 15,100,000
Liberty LNG
Debt and Equity Securities, FV-NI
Equity in earnings of unconsolidated affiliates, net											0
Liberty LNG | Nonconsolidated Investee or Group of Investees
Debt and Equity Securities, FV-NI
Equity investments, ownership interest										25.00%
Equity investments, carrying value								$ 2,100,000		$ 2,400,000	2,100,000
Equity in earnings of unconsolidated affiliates, net										300,000	$ (1,000,000.0)	$ 0
Cryomotive GmbH | Nonconsolidated Investee or Group of Investees
Debt and Equity Securities, FV-NI
Equity investments, ownership interest					24.90%	24.90%
Equity investments, carrying value										7,100,000
Equity in earnings of unconsolidated affiliates, net										(600,000)
New investments					$ 8,200,000	€ 6.8
HTEC | Nonconsolidated Investee or Group of Investees
Debt and Equity Securities, FV-NI
Equity investments, ownership interest			25.00%					15.60%			15.60%
Equity investments, carrying value										86,400,000
Equity in earnings of unconsolidated affiliates, net										$ 200,000
New investments			$ 50,500,000	$ 63.5				$ 15,700,000	$ 20.0
Unrealized (loss) gain on investment			$ 20,700,000
HTEC | Corporate Joint Venture | Common Stock
Debt and Equity Securities, FV-NI
Right of refusal compensation percentage (percent)			102.00%
HTEC | Corporate Joint Venture | Anniversary Period One
Debt and Equity Securities, FV-NI
Put option internal rate of return (percent)			10.00%
HTEC | Corporate Joint Venture | Anniversary Period One | Common Stock
Debt and Equity Securities, FV-NI
Invested capital multiple rate			1.65
HTEC | Corporate Joint Venture | Anniversary Period Two
Debt and Equity Securities, FV-NI
Put option internal rate of return (percent)			12.50%
HTEC | Corporate Joint Venture | Anniversary Period Two | Common Stock
Debt and Equity Securities, FV-NI
Invested capital multiple rate			1.65
Percentage of shares callable upon exercise of call option (percent)			20.00%
HTEC | Corporate Joint Venture | Squared Capital
Debt and Equity Securities, FV-NI
Equity investments, ownership interest			35.00%
New investments				$ 153.0

[1] Non-cash investing activities of $7.0 related to the conversion of a note receivable into an investment in equity securities in Stabilis Energy, Inc. during the year ended December 31, 2019.