CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net sales	$ 190.7	$ 231.8	$ 585.7	$ 724.9
Cost of products sold	155.5	187.1	475.1	585.8
Gross profit	35.2	44.7	110.6	139.1
Selling, general and administrative expenses	19.1	23.1	66.5	75.3
Asset restructuring and impairment costs (Note 10)	0.0	2.4	55.3	4.4
Other restructuring and non-routine costs	1.4	0.0	4.1	1.5
COVID-19 costs	0.6	0.0	2.1	0.0
Loss on debt extinguishment (Note 5)	0.0	0.0	1.9	0.0
Acquisition and due diligence costs	0.0	0.0	1.1	0.0
Pension settlement and other benefit costs (Note 6)	0.0	0.1	0.0	0.1
Other expense - net	0.2	0.1	0.6	1.6
Operating income (loss)	13.9	19.0	(21.0)	56.2
Interest expense - net	3.6	2.8	9.5	9.0
Income (loss) before income taxes	10.3	16.2	(30.5)	47.2
Provision (benefit) for income taxes	2.4	1.8	(4.7)	7.4
Net income (loss)	$ 7.9	$ 14.4	$ (25.8)	$ 39.8
Earnings (Loss) Per Common Share
Basic (in usd per share)	$ 0.46	$ 0.85	$ (1.55)	$ 2.35
Diluted (in usd per share)	$ 0.46	$ 0.84	$ (1.55)	$ 2.33
Weighted Average Common Shares Outstanding (in thousands)
Basic (in shares)	16,802	16,837	16,810	16,850
Diluted (in shares)	16,821	16,905	16,810	16,910
Cash dividends declared per share of common stock (in usd per share)	$ 0.47	$ 0.45	$ 1.41	$ 1.35