Segment and Geographic Area Information - Identifiable Assets by Reportable Segments (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Total assets	$ 16,374,211	$ 16,609,649	$ 18,270,652
Reportable Segments
Segment Reporting Information [Line Items]
Total assets	14,300,556	14,555,600	16,298,462
Reportable Segments \| Energy Storage
Segment Reporting Information [Line Items]
Total assets	11,086,694	11,285,847	13,246,412
Reportable Segments \| Specialties
Segment Reporting Information [Line Items]
Total assets	2,067,191	1,843,564	1,696,307
Reportable Segments \| Ketjen
Segment Reporting Information [Line Items]
Total assets	1,146,671	1,426,189	1,355,743
Corporate
Segment Reporting Information [Line Items]
Total assets	$ 2,073,655	$ 2,054,049	$ 1,972,190

Amount of asset recognized for present right to economic benefit.

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+ Details