Commitments and Contingencies - Restricted cash (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Security for sale/leaseback transactions to be released over lease term
Commitments and Contingencies
Restricted cash	$ 253.2	$ 352.3
Bank guarantees backed by security deposits
Commitments and Contingencies
Restricted cash	135.6	193.1
Security for letters of credit related to sale/leaseback transactions
Commitments and Contingencies
Restricted cash	88.4	159.6
Security for letters of credit related to customs and other transactions
Commitments and Contingencies
Restricted cash	47.2	33.5
Restricted cash held in escrow \| Texas Hydrogen Production Plant
Commitments and Contingencies
Restricted cash	62.0	62.0
Restricted cash held in escrow \| Georgia Hydrogen Production Plant
Commitments and Contingencies
Restricted cash	$ 18.1	$ 18.0

Amount of cash and cash equivalent restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.