Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) segment	Jun. 30, 2019 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Restructuring and related charges	$ 2.2	$ 1.4	$ 2.2	$ 2.0
Amortization of intangible assets	0.2		0.2
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	527.2	469.7	1,018.7	913.2
Total operating profit	103.6	80.5	191.6	151.2
Interest expense	2.0	2.0	4.0	4.3
Interest income	(0.2)	(0.6)	(1.0)	(1.5)
Other nonoperating (income) expense	(0.2)	(0.5)	0.1	(1.1)
Income before income taxes	102.0	79.6	188.5	149.5
Intersegment sales elimination
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	(0.1)	0.0	(0.2)	0.0
Corporate
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total operating profit	(26.7)	(18.3)	(44.7)	(34.5)
Other unallocated items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total operating profit	(2.4)	(1.4)	(2.4)	(2.0)
Proprietary Products | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	399.5	360.3	773.0	700.7
Total operating profit	112.2	88.8	205.4	165.8
Contract-Manufactured Products | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	127.8	109.4	245.9	212.5
Total operating profit	$ 20.5	$ 11.4	$ 33.3	$ 21.9