Statements of Consolidated Income (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net sales	$ 369.3	$ 395.2
Costs and expenses:
Cost of products sold, excluding depreciation and amortization and other items	286.6	315.1
Depreciation and amortization	13.2	11.9
Selling, general, administrative, research and development	23.9	25.2
Total costs and expenses	323.7	352.2
Operating income	45.6	43.0
Other (expense) income:
Interest expense	(6.1)	(5.7)
Other (expense) income, net	(0.8)	0.5
Income before income taxes	38.7	37.8
Income tax provision	(9.6)	(9.8)
Net income	$ 29.1	$ 28.0
Net income per common share:
Basic (in dollars per share)	$ 1.83	$ 1.74
Diluted (in dollars per share)	$ 1.81	$ 1.71
Weighted-average number of common shares outstanding:
Basic (shares)	15,838	16,108
Diluted (shares)	16,008	16,372