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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 |

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