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Investments - Investments in Equity Securities Narratives (Details) € in Millions, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Apr. 05, 2021 USD ($)	Apr. 05, 2021 EUR (€)
Debt and Equity Securities, FV-NI
Investments in equity securities	$ 90.6	$ 96.5		$ 90.6
Increase (decrease) in equity securities				(11.8)
New investments				6.0
McPhy
Debt and Equity Securities, FV-NI
Investments in equity securities	7.0	17.2		7.0
Increase (decrease) in equity securities	(4.0)		$ (4.1)	(10.2)	$ (16.1)
Stabilis Energy, Inc.
Debt and Equity Securities, FV-NI
Investments in equity securities	6.2	7.8		6.2
Increase (decrease) in equity securities	(1.2)		$ 5.4	(1.6)	$ 5.2
Transform Materials
Debt and Equity Securities, FV-NI
Investments in equity securities	25.1	25.1		25.1
Svante Inc.
Debt and Equity Securities, FV-NI
Investments in equity securities	38.5	38.5		38.5
Hy24
Debt and Equity Securities, FV-NI
Investments in equity securities	1.8	0.9		1.8		$ 1.3	€ 1.2
Gold Hydrogen LLC
Debt and Equity Securities, FV-NI
Investments in equity securities	2.0	2.0		2.0
Avina
Debt and Equity Securities, FV-NI
Investments in equity securities	10.0	5.0		$ 10.0
New investments	$ 5.0	$ 5.0