Statements of Consolidated Income (Unaudited) - USD ($) shares in Thousands, $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenues		$ 393.1	$ 332.8		$ 1,196.5	$ 1,044.4
Costs and expenses:
Cost of products sold, excluding depreciation and amortization and other items1	[1]	323.3	256.4		983.4	808.7
Depreciation and amortization		11.0	10.2		32.4	29.3
Selling, general, administrative, research and development	[2]	23.9	24.7		73.9	74.7
Goodwill impairment		0.0	0.0	$ 18.4	0.0	18.4
Other operating charges, net		0.0	0.0		0.1	0.0
Total costs and expenses		358.2	291.3		1,089.8	931.1
Operating income		34.9	41.5		106.7	113.3
Other income (expense):
Interest expense		(5.7)	(5.3)		(17.0)	(16.4)
Other income (expense), net		0.7	(0.2)		0.3	0.5
Income before income taxes		29.9	36.0		90.0	97.4
Income tax provision		(8.2)	(16.1)		(21.9)	(36.8)
Net income		$ 21.7	$ 19.9		$ 68.1	$ 60.6
Net income per common share:
Basic (in dollars per share)		$ 1.31	$ 1.18		$ 4.09	$ 3.55
Diluted (in dollars per share)		$ 1.29	$ 1.16		$ 4.03	$ 3.49
Weighted-average number of common shares outstanding (in thousands):
Basic (shares)		16,573	16,834		16,654	17,072
Diluted (shares)		16,783	17,160		16,882	17,363
Cash dividends declared (in dollars per share)		$ 0.55	$ 0.50		$ 1.65	$ 1.50

[1] See Note 5 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 (gain) loss 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 income (expense).