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Investments - Investments in Equity Securities Narratives (Details) € in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Mar. 31, 2022 EUR (€)
Debt and Equity Securities, FV-NI
Investments in equity securities	$ 78.0		$ 77.8
(Decrease) increase in fair value of investments in equity securities	(2.6)
Payments to acquire equity interest	3.4
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Debt and Equity Securities, FV-NI
Payments to acquire equity interest	0.5
Investment in Equity Securities Level 1
Debt and Equity Securities, FV-NI
Investments in equity securities	26.9		31.3
(Decrease) increase in fair value of investments in equity securities	(3.7)
Payments to acquire equity interest	0.0
Investment in Equity Securities, Level 2
Debt and Equity Securities, FV-NI
Investments in equity securities	7.4		6.2
(Decrease) increase in fair value of investments in equity securities	1.1
Payments to acquire equity interest	0.0
McPhy
Debt and Equity Securities, FV-NI
Investments in equity securities	26.9		31.3
(Decrease) increase in fair value of investments in equity securities	(3.7)	$ (2.6)
Stabilis Energy, Inc.
Debt and Equity Securities, FV-NI
Investments in equity securities	7.4		6.2
(Decrease) increase in fair value of investments in equity securities	1.1	5.9
Transform Materials
Debt and Equity Securities, FV-NI
Payments to acquire equity interest	25.1		25.1
Svante Inc.
Debt and Equity Securities, FV-NI
Payments to acquire equity interest	15.2		$ 15.2
Clean H2 Infra Fund
Debt and Equity Securities, FV-NI
Investments in equity securities	2.4			€ 2.2
Gold Hydrogen LLC
Debt and Equity Securities, FV-NI
Investments in equity securities		$ 1.0
Payments to acquire equity interest	$ 1.0

X

- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740

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Amount of increase (decrease) of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=123583714&loc=SL75117360-209713

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3444-108585

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+ References

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-Paragraph 13
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