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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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Commitments and Contingencies - Concentrations of Credit Risk (Details) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 12, 2023 USD ($) T	Sep. 30, 2023 USD ($) customer	Sep. 30, 2022 customer	Sep. 30, 2023 USD ($) customer	Sep. 30, 2022 USD ($) customer	Dec. 31, 2022 USD ($) customer
Customer Concentration
Federal depository insurance coverage		$ 0.3		$ 0.3
Restricted cash		539.4		539.4		$ 383.7
Letter of credit		426.9		426.9		379.6
Letters of credit on sale/leaseback agreements		396.2		396.2		354.0
Customs related letters of credit		30.7		30.7		25.6
Construction escrow		76.7		76.7		76.7
Suit filed by stock purchasers between january 19, 2022 and march 1, 2023
Customer Concentration
Production goal of hydrogen per day (in tons) \| T	70
Suit filed by stock purchasers between january 19, 2022 and march 1, 2023 \| Minimum
Customer Concentration
Revenue goal of 2022	$ 900.0
Suit filed by stock purchasers between january 19, 2022 and march 1, 2023 \| Maximum
Customer Concentration
Revenue goal of 2022	$ 925.0
Joule Processing LLC
Customer Concentration
Consideration held by paying agent.				1.2
Alloy Custom Products, LLC and WesMor Cryogenics, LLC
Customer Concentration
Consideration held by paying agent.				1.2
Collateral Related to Acquisitions \| Frames Holding B.V.
Customer Concentration
Restricted cash as collateral		$ 6.2		$ 6.2		$ 10.8
Accounts receivable \| Customer concentration \| One customers
Customer Concentration
Number of customers \| customer						1
Concentration risk (as a percent)						24.90%
Revenues \| Customer concentration \| Two customers
Customer Concentration
Number of customers \| customer			2		2
Concentration risk (as a percent)			66.90%		53.20%
Revenues \| Customer concentration \| Three customers
Customer Concentration
Number of customers \| customer		3		3
Concentration risk (as a percent)		44.30%		46.60%
Warrants issued with the Amazon, Inc transaction agreement
Customer Concentration
Reduction in revenue				$ 8.4	$ 10.4