Segment Information - Summary of Tangible and Intangible Assets by Segments (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Segment Reporting [Line Items]
Segment assets:	$ 1,722.3	$ 1,886.8
Goodwill	329.1	329.4
Corporate
Segment Reporting [Line Items]
Segment assets:	26.2	36.0
Railroad and Utility Products and Services
Segment Reporting [Line Items]
Goodwill	156.5	156.4
Railroad and Utility Products and Services \| Operating Segments
Segment Reporting [Line Items]
Segment assets:	833.5	827.5
Performance Chemicals
Segment Reporting [Line Items]
Goodwill	172.6	173.0
Performance Chemicals \| Operating Segments
Segment Reporting [Line Items]
Segment assets:	557.5	536.6
Carbon Materials and Chemicals \| Operating Segments
Segment Reporting [Line Items]
Segment assets:	$ 305.1	$ 486.7

Amount of asset recognized for present right to economic benefit.

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+ Details

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

+ References

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details