Goodwill and Intangible Assets - Schedule of Carrying Value of Goodwill by Segment (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Goodwill, beginning balance		$ 71,500,000	$ 76,100,000
Foreign currency impact		9,300,000	(4,600,000)
Impairment	$ (80,800,000)	(80,800,000)	0	$ 0
Goodwill, ending balance		0	71,500,000	76,100,000
Accumulated goodwill impairment		80,800,000
Rubber
Goodwill [Roll Forward]
Goodwill, beginning balance		28,600,000	30,500,000
Foreign currency impact		3,700,000	(1,900,000)
Impairment		(32,300,000)
Goodwill, ending balance		0	28,600,000	30,500,000
Specialty
Goodwill [Roll Forward]
Goodwill, beginning balance		42,900,000	45,600,000
Foreign currency impact		5,600,000	(2,700,000)
Impairment		(48,500,000)
Goodwill, ending balance		$ 0	$ 42,900,000	$ 45,600,000