Goodwill and Other Intangible Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Goodwill and Other Intangible Assets
Total accumulated goodwill impairment	$ 35,500,000	$ 35,500,000
Goodwill, impairment loss	0	0
Goodwill	173,000,000	173,000,000	$ 173,000,000
Amortization expense of intangible assets	6,500,000	7,800,000	9,500,000
Specialty Products and Solutions
Goodwill and Other Intangible Assets
Goodwill, impairment loss	0	0
Goodwill	49,300,000	49,300,000	49,300,000
Performance Brands
Goodwill and Other Intangible Assets
Goodwill, impairment loss	0	0
Goodwill	123,700,000	123,700,000	$ 123,700,000
Montana/Renewables
Goodwill and Other Intangible Assets
Goodwill	0	0
Corporate
Goodwill and Other Intangible Assets
Goodwill	$ 0	$ 0