Business Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 item	Sep. 30, 2012	Dec. 31, 2012
Business Segment Information
Number of reportable segments			2
Business segment information
Net sales	$ 214.1	$ 206.3	$ 639.6	$ 616.2
Operating income (loss)	16.4	16.3	61.2	54.5
TOTAL ASSETS	660.0		660.0		610.7
Technical Products
Business segment information
Net sales	104.4	98.7	317.2	311.6
Operating income (loss)	6.7	6.4	28.3	31.2
TOTAL ASSETS	365.9		365.9		348.5
Fine Paper
Business segment information
Net sales	102.6	99.1	302.0	281.8
Operating income (loss)	13.3	12.8	45.1	36.9
TOTAL ASSETS	217.4		217.4		214.0
Other
Business segment information
Net sales	7.1	8.5	20.4	22.8
Operating income (loss)	0.3	0.5		1.8
Unallocated corporate costs
Business segment information
Operating income (loss)	(3.9)	(3.4)	(12.2)	(15.4)
Corporate and Other
Business segment information
TOTAL ASSETS	$ 76.7		$ 76.7		$ 48.2