Segment Information - Segment Financial Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Assets	$ 3,618.2		$ 3,643.4
Depreciation and Amortization	40.0	$ 35.6
Capital Expenditures	71.3	90.6
Net sales	698.0	695.4
Cost of goods and services sold	466.1	465.2
Research and development	16.3	17.6
Selling, general and administrative expenses	88.0	86.7
Operating profit	107.0	122.8
Stock-based compensation	(1.3)	(5.0)
Restructuring and related charges	0.8	0.0
Interest (income) expense and other nonoperating expense (income), net	(3.5)	(4.6)
Income before income taxes and equity in net income of affiliated companies	110.5	127.4
Proprietary Products
Segment Reporting Information [Line Items]
Net sales	563.0	559.5
Contract-Manufactured Products
Segment Reporting Information [Line Items]
Net sales	135.0	135.9
Operating Segments
Segment Reporting Information [Line Items]
Net sales	698.0	695.4
Cost of goods and services sold
Research and development
Selling, general and administrative expenses
Other segment expense (income)
Operating profit	144.1	143.4
Operating Segments | Proprietary Products
Segment Reporting Information [Line Items]
Assets	2,625.1		2,621.1
Depreciation and Amortization	32.7	30.0
Capital Expenditures	51.9	61.1
Net sales	563.0	559.5
Cost of goods and services sold	352.8	352.4
Research and development	16.3	17.6
Selling, general and administrative expenses	60.3	60.7
Other segment expense (income)	3.0	2.5
Operating profit	130.6	126.3
Operating Segments | Contract-Manufactured Products
Segment Reporting Information [Line Items]
Assets	627.7		612.2
Depreciation and Amortization	6.4	4.7
Capital Expenditures	18.1	27.6
Net sales	135.0	135.9
Cost of goods and services sold	113.3	112.8
Research and development	0.0	0.0
Selling, general and administrative expenses	7.6	6.2
Other segment expense (income)	0.6	(0.2)
Operating profit	13.5	17.1
Corporate And Reconciling Items
Segment Reporting Information [Line Items]
Assets	365.4		$ 410.1
Depreciation and Amortization	0.9	0.9
Capital Expenditures	1.3	1.9
Stock-based compensation	(1.3)	(5.0)
Corporate general costs	(17.8)	(15.4)
Restructuring and related charges	17.8	0.0
Amortization of acquisition-related intangible assets	0.2	$ 0.2
Corporate And Reconciling Items | Other expense (income)
Segment Reporting Information [Line Items]
Restructuring and related charges	16.4
Corporate And Reconciling Items | Selling, General and Administrative Expenses
Segment Reporting Information [Line Items]
Restructuring and related charges	$ 1.4