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Restructuring and Impairment Activities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense | $ 0.6 | $ 1.6 | $ 1.0 | $ 2.7 |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance at beginning of year |  |  | 1.7 | 4.3 | $ 4.3
Accruals for announced programs |  |  | 0.8 |  | 3.5
Cash payments |  |  | (1.3) |  | (6.4)
Restructuring Reserve, Settled without Cash |  |  | 1.8 |  | 0.0
Exchange rate impacts |  |  | 0.0 |  | 0.3
Balance at end of period | 3.0 |  | 3.0 |  | $ 1.7
Corporate, Non-Segment [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense | 0.0 | 0.0 | 0.0 | 0.2 |
Engineered Papers [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense | 0.2 | 0.8 | 0.2 | 1.3 |
Engineered Papers [Member] | France [Member] | Employee severance [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense |  |  | 0.2 |  |
Engineered Papers [Member] | France, Brazil, And United States [Member] | Employee severance [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense |  |  |  | 0.7 |
Engineered Papers [Member] | Philippines [Member] | Asset Impairment Charge [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense |  |  | 0.0 | 0.6 |
Advanced Materials & Structures Segment [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense | $ 0.4 | $ 0.8 | 0.8 | $ 1.2 |
Advanced Materials & Structures Segment [Member] | UNITED STATES | Employee severance [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense |  |  | 0.6 |  |
Advanced Materials & Structures Segment [Member] | UNITED STATES | Asset Impairment Charge [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense |  |  | $ 0.2 |  |

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