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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

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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Amount of restructuring charges, remediation cost, and asset impairment loss.

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