Segment Information (Segment Financial Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 1,599.1	$ 1,509.1	$ 1,399.8
Operating profit	228.9	196.8	128.6
Interest expense, net	(6.5)	(7.0)	(12.5)
Income before income taxes	222.4	189.8	116.1
Segment assets	1,862.8	1,716.7	1,695.1
Capital expenditures	130.8	170.2	131.6
Depreciation and amortization expense	96.7	90.7	89.9
Proprietary Products [Member]
Segment Reporting Information [Line Items]
Net sales	1,236.9	1,189.9	1,098.3
Operating profit	242.2	241.9	212.2
Interest expense, net	0.0	0.0	0.0
Income before income taxes	242.2	241.9	212.2
Segment assets	1,321.3	1,173.9	1,083.7
Capital expenditures	107.2	133.2	113.2
Depreciation and amortization expense	77.1	71.7	69.9
Contract-Manufactured Products [Member]
Segment Reporting Information [Line Items]
Net sales	362.5	320.2	302.4
Operating profit	48.3	38.2	35.5
Interest expense, net	0.0	0.0	0.0
Income before income taxes	48.3	38.2	35.5
Segment assets	286.4	261.1	248.5
Capital expenditures	18.6	34.0	22.1
Depreciation and amortization expense	16.4	14.9	14.2
Corporate and Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	(0.3)	(1.0)	(0.9)
Operating profit	(61.6)	(83.3)	(119.1)
Interest expense, net	(6.5)	(7.0)	(12.5)
Income before income taxes	(68.1)	(90.3)	(131.6)
Segment assets	255.1	281.7	362.9
Capital expenditures	5.0	3.0	(3.7)
Depreciation and amortization expense	$ 3.2	$ 4.1	$ 5.8