Statements of Consolidated Income (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenues	$ 395.2	$ 388.0
Costs and expenses:
Cost of products sold, excluding depreciation and amortization and other items	315.1	316.7
Depreciation and amortization	11.9	10.5
Selling, general, administrative, research and development	25.2	23.6
Other operating charges, net	0.0	0.1
Total costs and expenses	352.2	350.9
Operating income	43.0	37.1
Other income (expense):
Interest expense	(5.7)	(5.6)
Other income, net	0.5	0.1
Income before income taxes	37.8	31.6
Income tax provision	(9.8)	(5.9)
Net income	$ 28.0	$ 25.7
Net income per common share:
Basic (in dollars per share)	$ 1.74	$ 1.54
Diluted (in dollars per share)	$ 1.71	$ 1.51
Weighted-average number of common shares outstanding (in thousands):
Basic (shares)	16,108	16,707
Diluted (shares)	16,372	17,031