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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Investments - Investments in Equity Securities Narratives (Details) € in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)	Apr. 05, 2021 EUR (€)
Debt and Equity Securities, FV-NI
Investments in equity securities	$ 94.6	$ 96.5
Increase (decrease) in equity securities	(2.0)
Payments to acquire equity interest	12.4
McPhy
Debt and Equity Securities, FV-NI
Investments in equity securities	17.9	17.2
Increase (decrease) in equity securities	0.5		$ (3.7)
Stabilis Energy, Inc.
Debt and Equity Securities, FV-NI
Investments in equity securities	5.3	7.8
Increase (decrease) in equity securities	(2.5)		$ 1.1
Transform Materials
Debt and Equity Securities, FV-NI
Investments in equity securities	25.1	25.1
Svante Inc.
Debt and Equity Securities, FV-NI
Investments in equity securities	38.5	38.5
Hy24
Debt and Equity Securities, FV-NI
Investments in equity securities	0.8	0.9		€ 0.7
Gold Hydrogen LLC
Debt and Equity Securities, FV-NI
Investments in equity securities	2.0	2.0
Avina
Debt and Equity Securities, FV-NI
Investments in equity securities	$ 5.0	5.0
New investments		$ 5.0