Segment Information - Segment Financial Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Operating profit	$ 126.2	$ 182.5	$ 249.0	$ 337.8
Stock-based compensation expense			(9.3)	(16.0)
Loss on disposal of plant	0.0	(2.2)	0.0	(11.6)
Interest (income) expense, net and other nonoperating (income) expense, net	(2.5)	(2.4)	(7.1)	(5.0)
Income before income taxes and equity in net income of affiliated companies	128.7	184.9	256.1	342.8
Operating Segments
Segment Reporting Information [Line Items]
Operating profit	148.2	209.1	291.6	397.2
Operating Segments | Proprietary Products
Segment Reporting Information [Line Items]
Operating profit	131.0	194.2	257.3	364.9
Operating Segments | Contract-Manufactured Products
Segment Reporting Information [Line Items]
Operating profit	17.2	14.9	34.3	32.3
Corporate and Unallocated
Segment Reporting Information [Line Items]
Operating profit	(22.0)	(26.6)	(42.6)	(59.4)
Stock-based compensation expense	(4.3)	(7.5)	(9.3)	(16.0)
Corporate general costs	(17.5)	(16.6)	(32.9)	(31.3)
Amortization of acquisition-related intangible assets	(0.2)	(0.2)	(0.4)	(0.4)
Loss on disposal of plant	0.0	(2.2)	0.0	(11.6)
Restructuring and severance related charges	$ 0.0	(0.1)	$ 0.0	(0.1)
Corporate and Unallocated | 2022 Restructuring Plan
Segment Reporting Information [Line Items]
Inventory write-down		0.9		0.9
Benefit within other expense (income) for revised severance estimates		$ 0.8		$ 0.8