Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) segment	Jun. 30, 2022 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	$ 753.8	$ 771.3	$ 1,470.4	$ 1,491.3
Operating profit	182.5	228.4	337.8	418.1
Stock-based compensation expense			(16.0)	(11.0)
Loss on disposal of plant	(2.2)	0.0	(11.6)	0.0
Interest (income) expense, net and other nonoperating (income) expense, net	(2.4)	1.2	(5.0)	3.1
Income before income taxes and equity in net income of affiliated companies	184.9	227.2	342.8	415.0
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit	209.1	248.1	397.2	460.6
Intersegment sales elimination
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	0.0	(0.2)	0.0	(0.2)
Corporate and Unallocated
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit	(26.6)	(19.7)	(59.4)	(42.5)
Stock-based compensation expense	(7.5)	(5.5)	(16.0)	(11.0)
Corporate general costs	(16.6)	(15.6)	(31.3)	(32.7)
Loss on disposal of plant	(2.2)	0.0	(11.6)	0.0
Restructuring and severance related charges		1.6	(0.1)
Amortization of acquisition-related intangible assets	(0.2)	(0.2)	(0.4)	(0.4)
Corporate and Unallocated | 2022 Restructuring Plan
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring and severance related charges	(0.1)		(0.1)
Inventory write-down	0.9
Corporate and Unallocated | 2020 Restructuring Plan
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring and severance related charges		1.6		1.6
Corporate and Unallocated | Other Operating Income (Expense)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Loss on disposal of plant	(2.2)		(11.6)
Corporate and Unallocated | Other Operating Income (Expense) | 2022 Restructuring Plan
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring and severance related charges	0.8		0.8
Proprietary Products
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Loss on disposal of plant	(2.2)		(11.6)
Proprietary Products | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	618.0	653.7	1,201.1	1,255.0
Operating profit	194.2	233.9	364.9	427.3
Contract-Manufactured Products | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	135.8	117.8	269.3	236.5
Operating profit	$ 14.9	$ 14.2	$ 32.3	$ 33.3