Segment Financial Information - Schedule of Segment Reconciliation (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Net sales from external customers		$ 1,806,700,000	$ 1,877,500,000	$ 1,893,900,000
Cost of Sales		1,446,900,000	1,448,700,000	1,442,900,000
Selling, general and administrative expenses		230,700,000	237,800,000	221,900,000
Loss (recovery) due to misappropriation of assets, net		(6,900,000)	59,300,000	0
Goodwill impairment	$ 80,800,000	80,800,000	0	0
Other segment items		27,700,000	29,000,000.0	23,800,000
LTIP and other non-operating charges		14,200,000	14,300,000	13,500,000
Loss (recovery) due to misappropriation of assets, net		(6,900,000)	59,300,000	0
Equity in earnings of affiliated companies, net of tax		500,000	600,000	500,000
Depreciation and amortization of intangible assets, right of use assets, and property, plant and equipment		131,900,000	125,300,000	113,000,000.0
Adjusted EBITDA		248,000,000.0	302,200,000	332,300,000
Assets		1,907,600,000	1,857,300,000	1,833,400,000
Capital expenditures		161,000,000.0	206,700,000	172,800,000
Rubber
Segment Reporting Information [Line Items]
Goodwill impairment		32,300,000
Specialty
Segment Reporting Information [Line Items]
Goodwill impairment		48,500,000
Operating Segments | Rubber
Segment Reporting Information [Line Items]
Net sales from external customers		1,188,200,000	1,231,200,000	1,283,300,000
Cost of Sales		969,200,000	954,300,000	992,600,000
Selling, general and administrative expenses		139,500,000	152,100,000	135,000,000.0
Loss (recovery) due to misappropriation of assets, net		0	0
Goodwill impairment		32,300,000
Other segment items		13,800,000	14,300,000	12,200,000
LTIP and other non-operating charges		6,600,000	7,200,000	7,200,000
Loss (recovery) due to misappropriation of assets, net		0	0
Equity in earnings of affiliated companies, net of tax		500,000	600,000	500,000
Depreciation and amortization of intangible assets, right of use assets, and property, plant and equipment		81,700,000	75,800,000	70,400,000
Adjusted EBITDA		154,500,000	194,100,000	221,600,000
Assets		1,093,700,000	1,047,800,000	1,014,300,000
Capital expenditures		66,000,000.0	102,100,000	99,500,000
Operating Segments | Specialty
Segment Reporting Information [Line Items]
Net sales from external customers		618,500,000	646,300,000	610,600,000
Cost of Sales		477,700,000	494,400,000	450,300,000
Selling, general and administrative expenses		90,100,000	84,700,000	85,700,000
Loss (recovery) due to misappropriation of assets, net		0	0
Goodwill impairment		48,500,000
Other segment items		13,900,000	15,700,000	13,500,000
LTIP and other non-operating charges		6,500,000	7,100,000	7,000,000.0
Loss (recovery) due to misappropriation of assets, net		0	0
Equity in earnings of affiliated companies, net of tax		0	0	0
Depreciation and amortization of intangible assets, right of use assets, and property, plant and equipment		50,200,000	49,500,000	42,600,000
Adjusted EBITDA		93,500,000	108,100,000	110,700,000
Assets		688,600,000	698,300,000	703,400,000
Capital expenditures		95,000,000.0	104,600,000	73,300,000
Corporate
Segment Reporting Information [Line Items]
Net sales from external customers		0	0	0
Cost of Sales		0	0	0
Selling, general and administrative expenses		1,100,000	1,000,000.0	1,200,000
Loss (recovery) due to misappropriation of assets, net		(6,900,000)	59,300,000
Goodwill impairment		0
Other segment items		0	(1,000,000.0)	(1,900,000)
LTIP and other non-operating charges		1,100,000	0	(700,000)
Loss (recovery) due to misappropriation of assets, net		(6,900,000)	59,300,000
Equity in earnings of affiliated companies, net of tax		0	0	0
Depreciation and amortization of intangible assets, right of use assets, and property, plant and equipment		0	0	0
Adjusted EBITDA		0	0	0
Assets		125,300,000	111,200,000	115,700,000
Capital expenditures		$ 0	$ 0	$ 0