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Investments - Narratives (Details) € in Millions, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	May 19, 2021 USD ($)	May 19, 2021 EUR (€)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt and Equity Securities, FV-NI
(Decrease) increase in fair value of investments in equity securities		$ (9.2)
New investments		45.0
Value of investment	$ 108.2	108.2				$ 73.6
Investment in Equity Securities Level 1
Debt and Equity Securities, FV-NI
(Decrease) increase in fair value of investments in equity securities	(17.2)	(19.8)
New investments		0.0
Value of investment	32.4	32.4				53.8
Investment in Equity Securities, Level 2
Debt and Equity Securities, FV-NI
(Decrease) increase in fair value of investments in equity securities	4.7	10.6
New investments		0.0
Value of investment	14.7	14.7				4.1
Investments in Equity Securities, All Others
Debt and Equity Securities, FV-NI
(Decrease) increase in fair value of investments in equity securities		0.0
New investments		45.0
Value of investment	61.1	$ 61.1				15.7
Earthly Labs Inc.
Debt and Equity Securities, FV-NI
New investments	$ 5.0
Equity investments, ownership interest (percent)	15.00%	15.00%
Transform Materials
Debt and Equity Securities, FV-NI
Equity investments, ownership interest (percent)	5.00%	5.00%
Value of investment	$ 25.0	$ 25.0
Svante Inc.
Debt and Equity Securities, FV-NI
Equity investments, ownership interest (percent)					10.00%
Value of investment					$ 15.0
Liberty LNG
Debt and Equity Securities, FV-NI
Equity investments, ownership interest (percent)	25.00%	25.00%
(Decrease) increase in fair value of investments in equity securities	$ 2.3	$ 2.3				$ 2.1
Cryomotive GmbH
Debt and Equity Securities, FV-NI
Equity investments, ownership interest (percent)			24.90%	24.90%
Value of investment	$ 7.7	$ 7.7	$ 7.9	€ 6.5
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	$ 2.9	$ 2.9				$ 2.8