Segment Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) segment	Mar. 31, 2017 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	2
Restructuring and related charges	$ 3.3
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	415.7	$ 387.7
Total operating (loss) profit	53.4	60.5
Interest expense	1.9	2.1
Interest income	(0.6)	(0.3)
Other nonoperating income	(1.6)	(0.8)
Income before income taxes	53.7	59.5
Net periodic benefit cost	1.2	1.9
Service cost	2.8	2.7
Proprietary Products [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	326.2	308.8
Total operating (loss) profit	62.8	65.1
Contract-Manufactured Products [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	89.5	79.1
Total operating (loss) profit	9.5	8.8
Intersegment sales elimination [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	0.0	(0.2)
Corporate [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total operating (loss) profit	(15.6)	(13.4)
Other unallocated items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total operating (loss) profit	(3.3)	0.0
Accounting Standards Update 2017-07 [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net benefit cost components other than service cost	$ 1.6	$ 0.8