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Related Parties
 12 Months Ended
Dec. 31, 2025
Related Party Transactions [Abstract]  
Related Parties Related Parties    
Related parties include key management personnel having authority and responsibility for planning, directing and monitoring the activities of the Company directly or indirectly and their close family members.
In the normal course of business, the Company from time to time receives services from, or sells products to, related unconsolidated parties, in transactions that are either not material or approved in accordance with our Related Party Transaction Approval Policy.
As of December 31, 2025, related parties primarily includes our joint venture that is accounted for using the equity method of accounting, “Deutsche Gaßrußwerke” (DGW).
December 31,
20252024
(In millions)
Trade receivables$0.5 $0.4 
Trade payables24.3 16.9 
Years Ended December 31,
202520242023
(In millions)
Purchases$127.2 $131.0 $111.7 
Sales and services7.4 3.9 2.5 
Alpha Carbone—In the second quarter of 2024, we invested in Alpha Carbone (“AC”), a French tire recycling company. This partnership will enable AC to produce commercial volumes of tire pyrolysis oil and recovered carbon black. In addition, we entered in a long-term supply agreement for the tire pyrolysis oil produced by AC. The tire pyrolysis oil will be used to manufacture circular carbon black for tire and rubber goods customers.
We invested approximately $0.3 million (€0.3 million) in shares of AC and agreed to contribute, in 12 installments through 2025, $7.9 million (€6.7 million) in convertible bonds. In 2025 and 2024, we contributed $4.1 million (€3.5 million) and $2.8 million (€2.7 million), respectively in a convertible bond.