Unaudited Quarterly Data (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effect of Fourth Quarter Events [Line Items]
Net sales									$ 938.5	$ 1,034.9	$ 979.9
Gross Profit	$ 44.3	$ 44.7	$ 50.7	$ 43.7	$ 34.6	$ 41.3	$ 55.1	$ 52.4	183.4	183.4	200.2
Operating Income (Loss)	22.1	19.0	19.8	17.4	17.8	16.5	(4.3)	24.1	78.3	54.1	104.3
Income from continuing operations	$ 15.6	$ 14.4	$ 13.6	$ 11.8	$ 12.9	$ 12.9	$ (4.8)	$ 16.2	$ 55.4	$ 37.2	$ 80.3
Earnings (Loss) Per Common Share
Basic (in dollar per share)	$ 0.92	$ 0.85	$ 0.80	$ 0.70	$ 0.77	$ 0.76	$ (0.29)	$ 0.96	$ 3.27	$ 2.20	$ 4.74
Diluted (in dollars per share)	$ 0.92	$ 0.84	$ 0.80	$ 0.69	$ 0.76	$ 0.75	$ (0.29)	$ 0.95	$ 3.26	$ 2.17	$ 4.68
Idled paper machine costs	$ 0.3	$ 2.4	$ 2.0
Indirect tax audit costs		0.1	0.6
Restructuring, integration and other costs		0.2	0.9		$ (0.4)	$ 2.2	$ 0.3		$ 6.2	$ 2.1	$ 1.3
Curtailment gain	1.6
Curtailment charge	0.1
Tax adjustments, settlements, and unusual provisions								$ 0.9
After-tax SERP settlement charge								0.6
Impairment loss (Note 13)					(2.9)	2.0	32.0		0.0	31.1	0.0
Pension plan settlement charge		0.1					1.0				0.6
Acquisition related adjustments					(0.8)	3.1			0.0	3.9	0.0
Insurance recoveries						0.4			0.0	0.4	3.2
Change in statutory tax rate, amount									0.0	1.6	9.7
Product
Effect of Fourth Quarter Events [Line Items]
Net sales	$ 213.6	$ 231.8	$ 253.4	$ 239.7	240.9	$ 256.2	$ 271.3	$ 266.5	$ 938.5	1,034.9	$ 979.9
Netherlands
Earnings (Loss) Per Common Share
Change in statutory tax rate, amount					$ 0.7					$ 0.7