Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Restructuring and related charges	$ 1.4	$ 2.2	$ 2.0	$ 5.5
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	469.7	447.5	913.2	863.2
Total operating (loss) profit	80.5	60.3	151.2	113.7
Interest expense	2.0	2.2	4.3	4.1
Interest income	(0.6)	(0.3)	(1.5)	(0.9)
Other nonoperating income	(0.5)	(1.7)	(1.1)	(3.3)
Income before income taxes	79.6	60.1	149.5	113.8
Proprietary Products [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	360.3	346.0	700.7	672.2
Total operating (loss) profit	88.8	71.7	165.8	134.5
Contract-Manufactured Products [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	109.4	101.5	212.5	191.0
Total operating (loss) profit	11.4	9.0	21.9	18.5
Corporate [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total operating (loss) profit	(18.3)	(18.2)	(34.5)	(33.8)
Other unallocated items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total operating (loss) profit	$ (1.4)	$ (2.2)	$ (2.0)	$ (5.5)