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Restructuring and Impairment Activities (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]      
Restructuring and impairment expense $ 0.4 $ 1.1  
Restructuring Reserve [Roll Forward]      
Balance at beginning of year 1.7 4.3 $ 4.3
Accruals for announced programs 0.4   3.5
Cash payments (0.6)   (6.4)
Restructuring Reserve, Settled without Cash 1.8   0.0
Exchange rate impacts 0.1   0.3
Balance at end of period 3.4   $ 1.7
Corporate, Non-Segment [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and impairment expense 0.0 0.2  
Engineered Papers [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and impairment expense 0.0 0.5  
Engineered Papers [Member] | France, Brazil, And United States [Member] | Employee severance [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and impairment expense   0.5  
Advanced Materials & Structures Segment [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and impairment expense $ 0.4 $ 0.4