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Investments - Investments in Equity Securities Narratives (Details) € in Millions, $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Apr. 05, 2021 EUR (€)
Debt and Equity Securities, FV-NI
Investments in equity securities	$ 89.9	$ 96.5		$ 89.9
Increase (decrease) in equity securities				(6.6)
Payments to acquire equity interest				25.5
McPhy
Debt and Equity Securities, FV-NI
Investments in equity securities	11.3	17.2		11.3
Increase (decrease) in equity securities	(6.6)		$ (8.2)	(6.2)	$ (11.9)
Stabilis Energy, Inc.
Debt and Equity Securities, FV-NI
Investments in equity securities	7.4	7.8		7.4
Increase (decrease) in equity securities	2.0		$ (1.4)	(0.4)	$ (0.3)
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	0.6	0.9		0.6		€ 0.5
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	$ 5.0	5.0		$ 5.0
New investments		$ 5.0