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Investments - Narratives (Details) € in Millions, $ in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2021 EUR (€)	Mar. 31, 2021 CAD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)	Dec. 31, 2020 CAD ($)	Sep. 30, 2019
Debt and Equity Securities, FV-NI
Value of investment	$ 114.6			$ 73.6
HTEC
Debt and Equity Securities, FV-NI
Value of investment			$ 20			$ 20
McPhy
Debt and Equity Securities, FV-NI
Value of investment	48.8	€ 41.6		53.8	€ 39.8
Stabilis Energy, Inc.
Debt and Equity Securities, FV-NI
Equity investment, cost	10.0			4.1
Unrealized gain	5.9
HTEC
Debt and Equity Securities, FV-NI
Value of investment	15.8			15.7
Svante Inc.
Debt and Equity Securities, FV-NI
Value of investment	15.0
Equity investment, cost	$ 15.0
Equity investments, ownership interest (percent)	10.00%	10.00%	10.00%
Transform Materials
Debt and Equity Securities, FV-NI
Value of investment	$ 25.0
Equity investments, ownership interest (percent)	5.00%	5.00%	5.00%
Liberty LNG
Debt and Equity Securities, FV-NI
Equity investments, ownership interest (percent)							25.00%
(Decrease) increase in fair value of investments in equity securities	$ 2.2			$ 2.1
Hudson Products de Mexico S.A. de CV | Investment in Joint Venture
Debt and Equity Securities, FV-NI
Equity investments, ownership interest (percent)				50.00%	50.00%	50.00%
(Decrease) increase in fair value of investments in equity securities	$ 2.8			$ 2.8

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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

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