Business Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Business segment
Net sales	$ 242.1	$ 242.1
Operating income (loss)	27.0	31.4
Unallocated corporate costs
Business segment
Operating income (loss)	(5.5)	(5.3)
Technical Products | Operating segments
Business segment
Net sales	121.9	121.5
Operating income (loss)	12.5	19.2
Fine Paper and Packaging | Operating segments
Business segment
Net sales	114.3	113.8
Operating income (loss)	20.3	17.5
Other | Operating segments
Business segment
Net sales	5.9	6.8
Operating income (loss)	$ (0.3)	$ 0.0