Acquisitions (Narrative) (Details) $ in Millions		3 Months Ended
Apr. 17, 2020 USD ($) production_facility	Mar. 31, 2019 USD ($)
ACP Europe SA
Business Acquisition [Line Items]
Business combinations, aggregate purchase price, net of cash acquired		$ 106.3
Subsequent Event \| Production Plants
Business Acquisition [Line Items]
Number of hydrogen production plants acquired \| production_facility	5
Acquisition of hydrogen production plants	$ 530.0

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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