Statements of Consolidated Income (Unaudited) - USD ($) shares in Thousands, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Net sales		$ 415.4	$ 356.3	$ 803.4	$ 711.6
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	[1]	343.4	289.6	660.1	552.3
Depreciation and amortization		10.9	9.5	21.4	19.1
Selling, general, administrative, research and development	[2]	26.4	26.3	50.0	50.0
Goodwill impairment		0.0	18.4	0.0	18.4
Other operating charges, net		0.0	0.0	0.1	0.0
Total costs and expenses		380.7	343.8	731.6	639.8
Operating income		34.7	12.5	71.8	71.8
Other (expense) income:
Interest expense		(5.7)	(5.5)	(11.3)	(11.1)
Other (expense) income, net		(0.5)	(0.1)	(0.4)	0.7
Income before income taxes		28.5	6.9	60.1	61.4
Income tax provision		(7.8)	(2.2)	(13.7)	(20.7)
Net income		$ 20.7	$ 4.7	$ 46.4	$ 40.7
Net income per common share:
Basic (in dollars per share)		$ 1.24	$ 0.28	$ 2.78	$ 2.37
Diluted (in dollars per share)		$ 1.22	$ 0.27	$ 2.74	$ 2.34
Weighted-average number of common shares outstanding (in thousands):
Basic (shares)		16,685	17,003	16,696	17,193
Diluted (shares)		16,905	17,201	16,962	17,418
Cash dividends declared (in dollars per share)		$ 0.55	$ 0.50	$ 1.10	$ 1.00

[1] See Note 4 for discussion of our adoption of ASU 2017-12 (as defined in Note 1) and the related reclassification of amounts previously presented in the Statements of Consolidated Income within Unrealized loss (gain) on derivative instruments and now included within Cost of products sold, excluding depreciation and amortization and other items.

[2] See Note 1 for discussion of our adoption of ASU 2017-07 (as defined in Note 1) and the related reclassification of amounts previously presented in the Statements of Consolidated Income within Selling, general, administrative, research and development and now included within Other (expense) income.