Segment Information - Identifiable Assets by Reportable Segments (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Total assets	$ 17,148,285	$ 16,609,649
Total investments in equity method investees	838,725	726,484
Reportable Segments
Segment Reporting Information [Line Items]
Total assets	14,587,014	14,555,600
Reportable Segments | Energy Storage
Segment Reporting Information [Line Items]
Total assets	11,183,308	11,285,847
Total investments in equity method investees	676,840	585,569
Reportable Segments | Specialties
Segment Reporting Information [Line Items]
Total assets	2,044,798	1,843,564
Reportable Segments | Ketjen
Segment Reporting Information [Line Items]
Total assets	1,358,908	1,426,189
Total investments in equity method investees	161,885	140,915
Corporate
Segment Reporting Information [Line Items]
Total assets	$ 2,561,271	$ 2,054,049