Business Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Business segment
Net sales	$ 232.9	$ 231.6	$ 721.0	$ 657.3
Operating income (loss)	26.9	24.4	92.2	80.5
Unallocated corporate costs
Business segment
Operating income (loss)	(4.6)	(3.6)	(14.5)	(13.2)
Technical Products | Operating segments
Business segment
Net sales	114.1	108.9	362.1	321.2
Operating income (loss)	14.1	11.0	53.4	41.7
Fine Paper and Packaging | Operating segments
Business segment
Net sales	112.9	116.9	340.4	330.3
Operating income (loss)	17.3	17.2	53.2	52.2
Other | Operating segments
Business segment
Net sales	5.9	5.8	18.5	5.8
Operating income (loss)	$ 0.1	$ (0.2)	$ 0.1	$ (0.2)