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Restructuring and Impairment Activities (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]                      
Restructuring and impairment expense $ 3.9 $ 1.5 $ 1.6 $ 1.1 $ 21.6 $ 1.3 $ 0.9 $ 1.8 $ 8.1 $ 25.6 $ 14.6
Restructuring Reserve [Roll Forward]                      
Balance at beginning of year       $ 4.3       $ 7.7 4.3 7.7  
Accruals for announced programs                 3.5 4.3  
Cash payments                 (6.4) (8.4)  
Exchange rate impacts                 0.3 0.7  
Balance at end of period $ 1.7       $ 4.3       1.7 4.3 7.7
Engineered Papers [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring and impairment expense                 5.3 4.0 14.4
Engineered Papers [Member] | Employee Severance [Member] | France, Brazil, And United States [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring and impairment expense                 0.8 3.4 7.8
Engineered Papers [Member] | Asset Impairment Charge [Member] | Polish and Brazil [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring and impairment expense                   0.6 1.4
Engineered Papers [Member] | Asset Impairment Charge [Member] | Philippines [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring and impairment expense                   0.0  
Engineered Papers [Member] | Asset Impairment Charge [Member] | Philippines [Member] | RTL facility [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring and impairment expense                 4.0   5.2
Engineered Papers [Member] | Asset Impairment Charge [Member] | France and United States [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring and impairment expense                 0.5    
Advanced Materials & Structures [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring and impairment expense                 2.7 21.3 (0.2)
Advanced Materials & Structures [Member] | Employee Severance [Member] | Belgium and United States [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring and impairment expense                 2.6    
Advanced Materials & Structures [Member] | Asset Impairment Charge [Member] | UNITED STATES                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring and impairment expense                 0.1    
Corporate, Non-Segment [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring and impairment expense                 $ 0.1 0.3 $ 0.4
Trade names [Member] | Advanced Materials & Structures [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Impairment of Intangible Assets, Finite-lived                   $ 20.7