Mativ (MATV) 10-K 1 Mar 18 2017 Q4 Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2017	Mar. 01, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	SCHWEITZER MAUDUIT INTERNATIONAL INC
Entity Central Index Key	1,000,623
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q4
Amendment Flag	false
Entity Common Stock, Shares Outstanding		30,771,272
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float	$ 1.1

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net sales	$ 982.1	$ 839.9	$ 764.1
Cost of products sold	699.8	583.2	539.7
Gross profit	282.3	256.7	224.4
Selling expense	33.3	25.3	22.2
Research expense	17.8	17.5	14
General expense	98.4	82.2	70.6
Total nonmanufacturing expenses	149.5	125	106.8
Restructuring and impairment expense	8.1	25.6	14.6
Operating profit	124.7	106.1	103
Interest expense	26.9	16.6	9.7
Other income, net	3.7	3.9	12.2
Income from continuing operations before income taxes and income from equity affiliates	101.5	93.4	105.5
Provision for income taxes	69.6	15.4	21.6
Income from equity affiliates, net of income taxes	2.5	4.8	6.6
Income from continuing operations	34.4	82.8	90.5
Gain (loss) from discontinued operations	0.1	0	(0.8)
Net income	$ 34.5	$ 82.8	$ 89.7
Net income (loss) per share - basic:
Income per share from continuing operations (in dollars per share)	$ 1.12	$ 2.71	$ 2.97
Loss per share from discontinued operations (in dollars per share)	0	0	(0.02)
Net income per share - basic (in dollars per share)	1.12	2.71	2.95
Net income (loss) per share – diluted:
Income per share from continuing operations (in dollars per share)	1.12	2.70	2.96
Loss per share from discontinued operations (in dollars per share)	0	0	(0.02)
Net income per share - diluted (in dollars per share)	$ 1.12	$ 2.70	$ 2.94
Weighted average shares outstanding:
Basic (in shares)	30,407,100	30,310,900	30,251,400
Diluted (in shares)	30,549,300	30,463,400	30,374,300

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 34.5	$ 82.8	$ 89.7
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	36	(16.7)	(54.4)
Unrealized gains (losses) on derivative instruments	2	13.2	(24.9)
Less: Reclassification adjustment for losses on derivative instruments included in net income	0.3	6.5	11.6
Net gain (loss) from postretirement benefit plans	8.3	(4.3)	(0.8)
Less: Amortization of postretirement benefit plans' costs included in net periodic benefit cost	3.3	3.4	3.6
Other comprehensive income (loss)	49.9	2.1	(64.9)
Comprehensive income	$ 84.4	$ 84.9	$ 24.8

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 106.9	$ 107.4
Accounts receivable, net	149.4	115.1
Inventories	155.2	119.4
Income taxes receivable	3.4	0
Assets Held-for-sale, Not Part of Disposal Group, Current	12.8	17.3
Other current assets	5.4	5.1
Total current assets	433.1	364.3
Property, plant and equipment, net	361.9	307.4
Deferred income tax benefits	1	3.7
Investment in equity affiliates	68.5	63.8
Goodwill	341.3	229.5
Intangible assets	297.2	177.5
Other assets	39.5	27.5
Total assets	1,542.5	1,173.7
LIABILITIES AND STOCKHOLDERS' EQUITY
Current debt	5.1	3
Accounts payable	59.4	50.3
Income taxes payable	4	5.3
Accrued expenses	78.6	77.2
Total current liabilities	147.1	135.8
Long-term debt	679.1	437.4
Accrued Income Taxes, Noncurrent	36.7	0
Pension and other postretirement benefits	30.7	33.1
Deferred income tax liabilities	42.3	29.8
Other liabilities	59.9	29.3
Total liabilities	995.8	665.4
Stockholders' equity:
Preferred stock, $0.10 par value per share; 10,000,000 shares authorized; none issued or outstanding	0	0
Common stock, $0.10 par value per share; 100,000,000 shares authorized; 30,711,299 and 30,544,494 shares issued and outstanding at December 31, 2017 and 2016, respectively	3.1	3.1
Additional paid-in-capital	66.3	59.2
Retained earnings	566.7	585.3
Accumulated other comprehensive loss	(89.4)	(139.3)
Total stockholders' equity	546.7	508.3
Total liabilities and stockholders' equity	$ 1,542.5	$ 1,173.7

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Preferred stock (dollars per share)	$ 0.1	$ 0.1
Preferred shares authorized (in shares)	10,000,000	10,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common stock (dollars per share)	$ 0.1	$ 0.1
Common shares authorized (in shares)	100,000,000	100,000,000
Common shares issued (in shares)	30,711,299	30,544,494
Common stock outstanding (in shares)	30,711,299	30,544,494

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock Issued [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance (in shares) at Dec. 31, 2014		30,465,522
Balance at Dec. 31, 2014	$ 489	$ 3	$ 49.8	$ 512.7	$ (76.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	89.7			89.7
Other comprehensive loss, net of tax	(64.9)				(64.9)
Dividends declared	(46.9)			(46.9)
Restricted stock issuances, net (in shares)		68,264
Restricted stock issuances, net	0	$ 0	0
Stock-based employee compensation expense	3.3		3.3
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net			0.5
Excess tax deficit of stock-based employee compensation	0.5
Stock issued to directors as compensation (in shares)		3,728
Stock issued to directors as compensation	0.1	$ 0	0.1
Purchases and cancellation of common stock	(2.9)
Purchases and cancellation of common stock (in shares)		(63,365)
Purchases and cancellation of common stock		$ 0		(2.9)
Balance (in shares) at Dec. 31, 2015		30,474,149
Balance at Dec. 31, 2015	467.9	$ 3	53.7	552.6	(141.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	82.8			82.8
Other comprehensive loss, net of tax	2.1				2.1
Dividends declared	(49.4)			(49.4)
Restricted stock issuances, net (in shares)		84,105
Restricted stock issuances, net	0.1	$ 0.1	0
Stock-based employee compensation expense	5.5		5.5
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation	(0.2)		(0.2)
Stock issued to directors as compensation (in shares)		6,585
Stock issued to directors as compensation	0.2	$ 0	0.2
Purchases and cancellation of common stock (in shares)		(20,345)
Purchases and cancellation of common stock	(0.7)	$ 0		(0.7)
Balance (in shares) at Dec. 31, 2016		30,544,494
Balance at Dec. 31, 2016	508.3	$ 3.1	59.2	585.3	(139.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	34.5			34.5
Other comprehensive loss, net of tax	49.9				49.9
Dividends declared	(51.9)			(51.9)
Restricted stock issuances, net (in shares)		186,867
Restricted stock issuances, net	0	$ 0	0
Stock-based employee compensation expense	6.9		6.9
Stock issued to directors as compensation (in shares)		5,798
Stock issued to directors as compensation	0.2	$ 0	0.2
Purchases and cancellation of common stock (in shares)		(25,860)
Purchases and cancellation of common stock	(1.2)	$ 0		(1.2)
Balance (in shares) at Dec. 31, 2017		30,711,299
Balance at Dec. 31, 2017	$ 546.7	$ 3.1	$ 66.3	$ 566.7	$ (89.4)

Consolidated Statements of Cha7

Consolidated Statements of Changes in Shareholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Dividends declared (in dollars per share)	$ 1.69	$ 1.62	$ 1.54

Consolidated Statements of Cash

Consolidated Statements of Cash Flow - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operations
Net income	$ 34.5	$ 82.8	$ 89.7
Less: Gain (loss) from discontinued operations	0.1	0	(0.8)
Income from continuing operations	34.4	82.8	90.5
Non-cash items included in net income:
Depreciation and amortization	59.5	44.5	41
Other Asset Impairment Charges	4.6	21.3	6.7
Deferred Income Taxes and Tax Credits	1.6	(13.5)	(6.7)
Pension and other postretirement benefits	3.8	3.8	4.2
Stock-based compensation	7.1	5.8	3.5
Income from equity affiliates	(2.5)	(4.8)	(6.6)
Gain on sale of intangible assets	0	(1.8)	(4.3)
(Gain) Loss on Disposition of Property Plant Equipment	(4.9)	0	0
Accrued Income Taxes, Noncurrent	36.7	0	0
Excess Tax (Benefit) Deficit from Share-based Compensation, Operating Activities	0	0.2	(0.5)
Cash dividends received from equity affiliates	1.8	3	3.9
Other items	0.7	(0.6)	0.1
Changes in operating working capital:
Accounts receivable	(0.9)	3.1	(18)
Inventories	(6.4)	(6.9)	1.3
Prepaid expenses	0.8	(0.5)	1.1
Accounts payable	4.7	(3.7)	6.5
Accrued expenses	(3)	0.8	3.7
Accrued income taxes	(7.1)	(3.8)	18.2
Net changes in operating working capital	(11.9)	(11)	12.8
Net cash provided by operating activities of:
Continuing operations	130.9	129.7	144.6
Discontinued operations	0.1	0	0.1
Cash provided by operations	131	129.7	144.7
Investing
Capital spending	(37.2)	(27.8)	(24.2)
Capitalized software costs	(3.5)	(2.8)	(0.9)
Acquisitions, net of cash acquired	(291.7)	0	(280.6)
Proceeds from Sale of Productive Assets	7	0	0
Other investing	6.9	8.2	(8)
Cash used for investing	(318.5)	(22.4)	(313.7)
Financing
Cash dividends paid to SWM stockholders	(51.9)	(49.4)	(46.9)
Changes in short-term debt	1.5	0	(0.4)
Proceeds from issuances of long-term debt	440.5	35.6	488.2
Payments on long-term debt	(208.8)	(171)	(338.7)
Payments for debt issuance costs	(0.6)	0	(7.4)
Purchases of common stock	(1.2)	(0.7)	(2.9)
Excess tax (deficit) benefit of stock-based awards	0	(0.2)	0.5
Cash provided by (used in) financing	179.5	(185.7)	92.4
Effect of exchange rate changes on cash and cash equivalents	7.5	(0.7)	(27.2)
Decrease in cash and cash equivalents	(0.5)	(79.1)	(103.8)
Cash and cash equivalents at beginning of period	107.4	186.5	290.3
Cash and cash equivalents at end of period	$ 106.9	$ 107.4	$ 186.5

General

General	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	General Nature of Business Schweitzer-Mauduit International, Inc., or SWM or the Company, headquartered in the United States of America, is a multinational diversified producer of highly engineered solutions and advanced materials for a variety of industries. The Company maintains two operating product line segments: Advanced Materials and Structures and Engineered Papers. The Advanced Materials & Structures segment, or AMS, produces mostly resin-based rolled goods such as nets, films and meltblown materials, typically through an extrusion process or other non-woven technologies. These products are used in a variety of specialty applications across the filtration, construction and infrastructure, transportation, industrial and medical end-markets. As discussed more fully in Note 3 . Business Acquisitions, in January 2017, the Company completed the acquisition of Conwed Plastics LLC, a Delaware limited liability company, and its Belgian subsidiary ("Conwed NV" and collectively with Conwed Plastic LLC, “Conwed”), which has been integrated into the AMS segment. The Engineered Papers segment, or EP, primarily serves the tobacco industry with production of various cigarette papers and reconstituted tobacco products, or "recon". Traditional reconstituted tobacco leaf, or "RTL", is used as a blend with virgin tobacco in cigarettes and used as wrappers and binders for cigars. Recon, as well as LIP (low ignition propensity) cigarette paper, a specialty product with fire-safety features, are two key profit drivers, which together account for more than half of segment net sales. The EP segment also produces non-tobacco papers for both premium applications, such as energy storage, and industrial commodity paper grades, which are often produced to maximize machine utilization. We conduct business in over 90 countries and operate 23 production locations worldwide, with facilities in the U.S., Canada, United Kingdom, France, Luxembourg, Belgium, Russia, Brazil, China and Poland. We also have a 50% equity interest in two joint ventures in China. The first, China Tobacco Mauduit (Jiangmen) Paper Industry Ltd., or CTM, produces cigarette and porous plug wrap papers and the second, China Tobacco Schweitzer (Yunnan) Reconstituted Tobacco Co. Ltd., or CTS, produces RTL. As used in this 2017 Annual Report on Form 10-K, unless the context indicates otherwise, references to "we," "us," "our," "SWM," "Schweitzer-Mauduit" or similar terms include Schweitzer-Mauduit International, Inc. and its consolidated subsidiaries.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The accompanying consolidated financial statements and the notes thereto have been prepared in accordance with accounting principles generally accepted in the United States of America, or U.S. GAAP. The preparation of financial statements in conformity with U.S. GAAP requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting periods. The Company believes the estimates and assumptions used in the preparation of these consolidated financial statements are reasonable, based upon currently available facts and known circumstances. Actual results may differ from those estimates and assumptions as a result of a number of factors, including those discussed elsewhere in this report and in its other public filings from time to time. Principles of Consolidation The consolidated financial statements include the accounts of the Company and wholly-owned, majority-owned and controlled subsidiaries. Intercompany balances and transactions have been eliminated. Certain reclassifications of prior year data were made in the notes to consolidated financial statements. The reclassifications were made to conform to the current year presentation. The Company uses the equity method to account for its investments in two joint ventures with the China National Tobacco Corporation (see Note 8 . Joint Ventures). Investment in equity affiliates represents the Company’s investment in these joint ventures. The Company’s 50% share of the net income (loss) of the joint ventures is included in the consolidated statements of income as income (loss) from equity affiliates. Revenue Recognition The Company recognizes revenue and the related accounts receivable when the following four criteria are met: (1) persuasive evidence of an arrangement exists; (2) ownership has transferred to the customer; (3) the selling price is fixed or determinable; and (4) collection is reasonably assured based on the Company's judgment regarding the collectability of its accounts receivable. Generally, the Company recognizes revenue when it ships its manufactured product and title and risk of loss passes to its customer in accordance with the terms of sale of the product. Revenue is recorded at the time of shipment for terms designated free on board, shipping point, or equivalent. For sales transactions designated free on board, destination, or equivalent, revenue is recorded when the product is delivered to the customer's delivery site, at which time title and risk of loss are transferred. Provisions for discounts, returns, allowances, customer rebates and other adjustments are provided for in the same period the related revenue is recorded. Deferred revenue represents advance payments from customers which are earned based upon a mutually agreed-upon amount per unit of future product sales. Freight Costs The cost of delivering finished goods to the Company's customers is recorded as a component of cost of products sold. Those costs include the amounts paid to a third party to deliver the finished goods. Any freight costs billed to and paid by a customer are included in revenue. Royalty Income Royalties from third-party patent licenses are recognized when earned, including monies received at an agreement's initiation attributable to past sales. The Company recognizes up-front payments upon receipt when it has no future performance requirement or ongoing obligation arising from its agreements and the payment is for a separate earnings process. Minimum annual royalties received in advance are deferred and are recognized in the period earned. The Company recognized $3.9 million , $8.3 million and $9.6 million of royalty income during 2017 , 2016 and 2015 respectively, which is included in net sales in the Consolidated Statements of Income. Foreign Currency Translation The income statements of foreign entities are translated into U.S. dollars at average exchange rates prevailing during the periods presented. The balance sheets of these entities are translated at period-end exchange rates, and the differences from historical exchange rates are reflected in a separate component of accumulated other comprehensive income (loss) as unrealized foreign currency translation adjustments. Foreign currency risks arise from transactions and balances denominated in non-local currencies. Gains and losses resulting from re-measurement and settlement of such transactions and balances, included in other income (expense), net, were a loss of $3.5 million , a loss of $0.2 million and a gain of $0.8 million in 2017 , 2016 and 2015 , respectively. Derivative Instruments The Company is exposed to changes in foreign currency exchange rates, interest rates and commodity prices. The Company utilizes a variety of practices to manage these market risks, including where considered appropriate, derivative instruments. The Company uses derivative instruments only for risk management purposes and not for trading or speculation. All derivative instruments the Company uses are either exchange traded or are entered into with major financial institutions in order to reduce credit risk and risk of nonperformance by third parties. The Company believes the credit risks with respect to the counterparties, and the foreign currency risks that would not be hedged if the counterparties fail to fulfill their obligations under the contracts, are not material in view of its understanding of the financial strength of the counterparties. Gains and losses on instruments that hedge firm commitments are deferred and included in the basis of the underlying hedged items. All other hedging gains and losses are included in period income or expense based on the period-end market price of the instrument and are included in the Company's operating cash flows. See Note 14 . Derivatives, for additional information. Cash and Cash Equivalents The Company considers all highly liquid, unrestricted investments with remaining maturities of three months or less to be cash equivalents, including money market funds with no restrictions on withdrawals. Business Combinations The Company uses the acquisition method of accounting for business combinations. At the acquisition date, the Company records assets acquired and liabilities assumed at their respective fair market values. The Company estimates fair value using the exit price approach which is the price that would be received to sell an asset or paid to transfer a liability in an orderly market. An exit price is determined from a market participant's viewpoint in the principal or most advantageous market and may result in the Company valuing assets or liabilities at a fair value that is not reflective of the Company's intended use of the assets or liabilities. Any excess consideration above the estimated fair values of the net assets acquired is recognized as goodwill on the Company's Consolidated Balance Sheets. The operating results of acquired businesses are included in the Company's results of operations beginning as of their effective acquisition dates. Acquisition costs are expensed as incurred and were $0.2 million , $1.8 million , and $2.6 million in 2017 , 2016 and 2015 , respectively. Impairment of Long-Lived Assets, Goodwill and Intangible Assets The Company evaluates the carrying value of long-lived assets, including property and equipment, goodwill and intangible assets when events and circumstances warrant a review. Goodwill is also tested for impairment annually during the fourth quarter. Goodwill may be evaluated using a qualitative evaluation and/or a two-step test at the reporting unit level. The first step compares the book value of the reporting unit to its fair value. If the book value of a reporting unit exceeds its fair value, the Company performs the second step. In the second step, the Company determines an implied fair value of the reporting unit's goodwill by allocating the fair value of the reporting unit to all of the assets and liabilities other than goodwill. The difference between the total fair value of the reporting unit and the fair value of all the assets and liabilities other than goodwill is the implied fair value of that goodwill. Any impairment loss is measured as the excess of the book value of the goodwill over the implied fair value of that goodwill. See Note 9 . Goodwill for further discussion of the Company's annual impairment test results. During the annual testing in the fourth quarter of 2017 , the estimated fair value of each of the Company's reporting units was in excess of its respective carrying value. We have acquired trade names that have been determined to have indefinite lives. We evaluate a number of factors to determine whether an indefinite life is appropriate, including the competitive environment, category share, business history, product life cycle and operating plans. Indefinite-lived intangibles are evaluated for impairment annually during the fourth quarter. Additionally, when certain events or changes in operating conditions occur, an impairment assessment is performed and indefinite-lived trade names may be adjusted to a determinable life or an impairment charge may be recorded. In the fourth quarter of 2016, the Company made a strategic decision to transition away from certain legacy business trade names associated with our recent acquisitions in favor of a streamlined SWM branding approach. As a result, during the fourth quarter of 2016, the Company recognized an impairment loss related to the DelStar trade name, the financial impact of which is described in Note 10 . Intangible Assets. The cost of intangible assets with determinable useful lives is amortized to reflect the pattern of economic benefits consumed, which approximates a straight-line basis, over the estimated periods benefited. When certain events or changes in operating conditions occur, an impairment assessment is performed and lives of intangible assets with determinable lives may be adjusted. The carrying value of long-lived assets is reviewed to determine if events or circumstances have changed which may indicate that the assets may be impaired or the useful life may need to be changed. Upon occurrence of such a triggering event, the Company considers internal and external factors relating to each asset group, including expectation of future profitability, undiscounted cash flows and its plans with respect to the operations. If impairment is indicated, an impairment loss is measured by the amount the net carrying value of the asset exceeds its estimated fair value. Environmental Spending Environmental spending is capitalized if such spending qualifies as property, plant and equipment, substantially increases the economic value or extends the useful life of an asset. All other such spending is expensed as incurred, including fines and penalties incurred in connection with environmental violations. Environmental spending relating to an existing condition caused by past operations is expensed. Liabilities are accrued when environmental assessments are probable and the costs can be reasonably estimated. Generally, timing of these accruals coincides with completion of a feasibility study or commitment to a formal plan of action. Capitalized Software Costs The Company capitalizes certain purchases of software and software development costs in connection with major projects of software development for internal use. These costs are included in Other assets on the Consolidated Balance Sheets and are amortized using the straight-line method over the estimated useful life not to exceed seven years . Costs associated with business process redesign, end-user training, system start-up and ongoing software maintenance are expensed as incurred. Amortization of capitalized software was $1.1 million , $1.0 million and $2.0 million for the years ended December 31, 2017 , 2016 and 2015 , respectively. Accumulated amortization of capitalized software costs was $35.4 million and $31.5 million at December 31, 2017 and 2016 , respectively. Business Tax Credits Business tax credits represent value added tax credits receivable and similar assets, such as Imposto sobre Circulação de Mercadorias e Serviços, or ICMS, in Brazil. Business tax credits are generated when value-added taxes, or VAT, are paid on purchases. VAT and similar taxes are collected from customers on certain sales. In some jurisdictions, export sales do not require VAT collection. See Note 11 . Other Assets for additional information. Income Taxes The Company accounts for income taxes under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements. Under this method, deferred tax assets and liabilities are determined on the basis of the differences between the financial statement and tax bases of assets and liabilities by using enacted tax rates in effect for the year in which the differences are expected to reverse. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date. The Company recognizes deferred tax assets to the extent that it believes that these assets are more likely than not to be realized. In making such a determination, all available positive and negative evidence is considered, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies, and results of recent operations. If it is determined that the Company would be able to realize the deferred tax assets in the future in excess of their net recorded amount, an adjustment would be made to the deferred tax asset valuation allowance, which would reduce the provision for income taxes. The Company records uncertain tax positions in accordance with ASC 740 on the basis of a two-step process in which (1) it is determined whether it is more likely than not that the tax positions will be sustained on the basis of the technical merits of the position and (2) for those tax positions that meet the more-likely-than-not recognition threshold, the Company recognizes the largest amount of tax benefit that is more than 50 percent likely to be realized upon ultimate settlement with the related tax authority. On December 22, 2017, the 2017 Tax Cuts and Jobs Act (the “Tax Act”) was enacted into law and the new legislation contains several key tax provisions that affected SWM, which include, but are not limited to, a one-time mandatory transition tax on accumulated foreign earnings and a reduction of the corporate income tax rate from 35% to 21% effective January 1, 2018. The Company is required to recognize the effect of the tax law changes in the period of enactment, such as determining the transition tax, remeasuring U.S. deferred tax assets and liabilities as well as reassessing the net realizability of its deferred tax assets and liabilities. In December 2017, the SEC staff issued Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act (“SAB 118”), which allows the Company to record provisional amounts during a measurement period not to extend beyond one year of the enactment date. Since the Tax Act was passed late in the fourth quarter of 2017, and ongoing guidance and accounting interpretation is expected over the next 12 months, the Company considers the accounting of the transition tax, deferred tax re-measurements, and other items to be incomplete due to the forthcoming guidance and its ongoing analysis of final year-end data and tax positions. The Company expects to complete its analysis within the measurement period in accordance with SAB 118. Pension and Other Postretirement Benefits Accounting The Company recognizes the estimated compensation cost of employees' pension and other postretirement benefits over their approximate period of service. The Company's earnings are impacted by amounts of expense recorded related to these benefits, which primarily consist of U.S. and French pension benefits and U.S. other postretirement benefits, or OPEBs. Each year's recorded expenses are estimates based on actuarial calculations of the Company's accumulated and projected benefit obligations, or PBOs, for the Company's various plans. Suspension of additional benefits for future service is considered a curtailment, and if material, necessitates a re-measurement of plan assets and PBO. As part of a re-measurement, the Company adjusts its discount rates and other actuarial assumptions, such as retirement, turnover and mortality table assumptions, as appropriate. See Note 17 . Postretirement and Other Benefits for additional information. Comprehensive Income Comprehensive income includes net income, as well as items charged and credited directly to stockholders' equity, which are excluded from net income. The Company has presented comprehensive income in the Consolidated Statements of Comprehensive Income. Reclassification adjustments of derivative instruments are presented in Net sales and Interest expense in the Consolidated Statements of Income. See Note 14 . Derivatives for additional information. Amortization of accumulated pension and other post-employment benefit (OPEB) liabilities are included in the computation of net periodic pension and OPEB costs, which are more fully discussed in Note 17 . Postretirement and Other Benefits. Components of accumulated other comprehensive income (loss) were as follows ($ in millions): December 31, 2017 2016 Accumulated pension and OPEB liability adjustments, net of income tax benefit of $13.8 million and $17.6 million at December 31, 2017 and 2016, respectively $ (24.9 ) $ (36.5 ) Accumulated unrealized loss on derivative instruments, net of income tax benefit of $0.2 million and $3.0 million at December 31, 2017 and 2016, respectively 0.4 (1.9 ) Accumulated unrealized foreign currency translation adjustments, net of income tax benefit of $4.5 million and $0.0 million at December 31, 2017 and 2016, respectively (64.9 ) (100.9 ) Accumulated other comprehensive loss $ (89.4 ) $ (139.3 ) Changes in the components of accumulated other comprehensive income (loss) were as follows ($ in millions): For the Years Ended December 31, 2017 2016 2015 Pre-tax Tax Net of Tax Pre-tax Tax Net of Tax Pre-tax Tax Net of Tax Pension and OPEB liability adjustments $ 15.4 $ (3.8 ) $ 11.6 $ 3.4 $ (4.3 ) $ (0.9 ) $ 1.9 $ 0.9 $ 2.8 Derivative instrument adjustments 5.1 (2.8 ) 2.3 23.0 (3.3 ) 19.7 (13.6 ) 0.3 (13.3 ) Unrealized foreign currency translation adjustments 31.5 4.5 36.0 (16.7 ) — (16.7 ) (54.4 ) — (54.4 ) Total $ 52.0 $ (2.1 ) $ 49.9 $ 9.7 $ (7.6 ) $ 2.1 $ (66.1 ) $ 1.2 $ (64.9 ) Restricted Stock All of the Company's restricted stock grants, including those that have been earned in the case of performance-based shares and cliff-vesting grants that are not performance based, vest upon completion of a specified period of time, typically between two and four years. The fair value of each award is equal to the share price of the Company's stock on the date of the grant. This cost is recognized over the vesting period of the respective award. The Company records forfeitures of shares related to continued service requirements as they occur. A summary of outstanding restricted stock awards as of December 31, 2017 and 2016 is included in Note 18 . Stockholders' Equity. Restricted Stock Plan Performance Based Shares The Company's long-term incentive compensation program, or LTICP, for key employees includes an equity-based award component that is provided through the Long-term Incentive Plan, or LTIP, which the Company adopted in 2015 and which replaced its previous Restricted Stock Plan, or RSP. The objectives under the LTICP are established at the beginning of a performance cycle and are intended to focus management on longer-term strategic goals. The Compensation Committee of the Board of Directors designates participants in the LTICP and LTIP and determines the equity-based award opportunity in the form of restricted stock for each performance cycle, which is generally measured on the basis of a one year performance period (the measurement period). The restricted shares are considered issued and outstanding when the number of shares becomes fixed, after the annual performance is determined, and such awards vest at the end of the performance year or some predetermined period thereafter. The Company recognizes compensation expense with an offsetting credit to additional paid-in-capital over the performance period based on the fair value of the award at the date of grant, with compensation expense being adjusted cumulatively based on the number of shares expected to be earned according to the level of achievement of performance goals. Fair Value Option The Company has elected not to measure its financial instruments or certain commitments at fair value. Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update ("ASU") 2014-09, "Revenue from Contracts with Customers" (Topic 606). This guidance specifies how and when an entity will recognize revenue arising from contracts with customers and requires entities to disclose information about the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. In August 2015, the FASB deferred the effective date for annual reporting periods beginning after December 15, 2017 (including interim reporting periods within those periods). The Company adopted this ASU effective January 1, 2018, utilizing the modified retrospective transition approach upon adoption. This approach requires an adjustment upon adoption to the financial statements to reflect the cumulative impact of the guidance and results in no change to prior period financial statements. Based on the evaluation of the provisions included in the new guidance, along with the related updates discussed below, the adoption of this guidance will not materially impact the amount or timing of revenues recognized in the consolidated financial statements or materially affect our financial position. The Company has two main sources of revenue: product sales and materials conversion. The Company recognizes product sales revenues when control of a product is transferred to the customer. For the majority of product sales, transfer of control occurs when the products are shipped from one of the Company’s manufacturing facilities to the customer. The cost of delivering finished goods to the Company’s customers is recorded as a component of cost of products sold. Those costs include the amounts paid to a third party to deliver the finished goods. Any freight costs billed to and paid by a customer are included in net sales. The Company provides services to customers in conversion of customer-owned raw materials into processed finished goods. In these transactions, the Company generally recognizes revenue as processing occurs. Revenue is recognized when obligations under the terms of a contract with a customer are satisfied, which generally occurs when control of the promised goods or services is transferred to the customer, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. Generally, the Company considers collectability of amounts due under a contract to be probable upon inception of a sale based on an evaluation of the credit worthiness of each customer. If collectability is not considered to be probable, the Company defers recognition of revenue on satisfied performance obligations until the uncertainty is resolved. Any variable consideration, such as discounts or price concessions, is set forth in the terms of the contract at inception, and is included in the assessment of the transaction price at the outset of the arrangement. The transaction price is allocated to the individual performance obligations due under the contract based on the relative stand-alone fair value of the performance obligations identified in the contract. The Company typically uses an observable price to determine the stand-alone selling price for separate performance obligations. Depending on the terms of an arrangement, the Company may defer the recognition of a portion of the consideration received or receivable, including amounts considered refundable, which is dependent on satisfaction of a future performance obligation. Incidental items that are immaterial in the context of the contract are recognized as expense in the period incurred. The Company generally expenses sales commissions and other costs to obtain a contract when incurred because the amortization period would have been one year or less. These costs are recorded within sales and marketing expenses. The Company does not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) contracts for which we recognize revenue at the amount to which we have the right to invoice for services performed. As a practical expedient, the Company treats shipping and handling activities that occur after control of the good transfers as fulfillment activities, and therefore, does not account for shipping and handling costs as a separate performance obligation. In July 2015, the FASB issued ASU 2015-11, "Inventory (Topic 330): Simplifying the Measurement of Inventory." This update requires entities to measure inventory at the lower of cost and net realizable value. Net realizable value is the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. Subsequent measurement is unchanged for inventory measured using the Last-in, First-out or the retail inventory method. This guidance is effective for annual reporting periods beginning after December 15, 2016, and interim periods thereafter. The Company adopted this guidance as of January 1, 2017. Adoption of ASU 2015-11 did not have an impact on the consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842): Amendments to the FASB Accounting Standards Codification." The new standard establishes a right-of-use model that requires a lessee to record a right-of-use asset and a lease liability on the balance sheet for all leases with terms longer than twelve months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. This guidance is effective for annual reporting periods beginning after December 15, 2018, and interim periods thereafter. Early adoption is permitted. Companies must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. The Company is currently in the process of evaluating the impact of the pronouncement on the Company's outstanding leases and expects that adoption will have an impact on the consolidated balance sheets related to recording right-of-use assets and corresponding lease liabilities. Further, the Company is currently in the process of evaluating the impact of adoption on the consolidated statements of income. In March 2016, the FASB issued ASU 2016-09, "Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting." This standard makes several modifications to existing guidance related to the accounting for forfeitures, employer tax withholding on share-based compensation and the financial statement presentation of excess tax benefits or deficiencies. ASU 2016-09 also clarifies the statement of cash flows presentation for certain components of share-based awards. This guidance is effective for annual reporting periods beginning after December 15, 2016, and interim periods thereafter. The Company adopted this guidance as of January 1, 2017. Adoption of ASU 2016-09 did not have an impact on the consolidated financial statements. In March, April and May 2016, the FASB issued ASU 2016-08, “Revenue from Contracts with Customers: Principal versus Agent Considerations (Reporting Revenue Gross versus Net),” ASU 2016-10, “Revenue from Contracts with Customers: Identifying Performance Obligations and Licensing,” ASU 2016-11, "Revenue Recognition (Topic 605) and Derivatives and Hedging (Topic 815): Rescission of SEC Guidance Because of Accounting Standards Updates 2014-09 and 2014-16 Pursuant to Staff Announcements at the March 3, 2016 EITF Meeting," and ASU 2016-12, "Revenue from Contracts with Customers: Narrow-Scope Improvements and Practical Expedients," which provide supplemental adoption guidance and clarification to ASC 2014-09. ASU 2016-08, ASU 2016-10, ASU 2016-11 and ASU 2016-12 must be adopted concurrently with the adoption of ASU 2014-09. The Company is currently in the process of finalizing the financial statement disclosures required under ASU 2014-09 that will be incorporated in the Company's Form 10-Q for the first quarter of 2018 upon adoption of the guidance but does not expect that adoption of these updates will materially affect our financial position or materially impact the amount or timing of revenues recognized in the consolidated financial statements, as discussed above. In October 2016, the FASB issued ASU 2016-16, "Income Taxes (Topic 718): Intra-Entity Transfers of Assets Other Than Inventory." This standard states that an entity should recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs, thus eliminating the exception for an intra-entity transfer of an asset other than inventory. This guidance is effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods within those annual reporting periods. Early adoption is permitted. The Company will adopt this ASU effective January 1, 2018, utilizing the modified retrospective basis transition approach upon adoption. The adoption of this guidance will result in a cumulative-effect adjustment directly to retained earnings of $2.2 million as of January 1, 2018. In January 2017, the FASB issued ASU No. 2017-01, "Business Combinations (Topic 805): Clarifying the Definition of a Business." The guidance clarifies the definition of a business with the objective of assisting entities in evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. Acquisitions of integrated sets of assets and activities that do not meet the definition of a business are accounted for as asset acquisitions. The new update is effective for annual periods beginning after December 15, 2017. The amendments in ASU 2017-01 will be implemented on a prospective basis in the first quarter of 2018 and are not expected to have a material impact on the Company's financial statements. In January 2017, the FASB issued ASU 2017-04, "Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment." The amendment eliminates the second step of the analysis that required the measurement of a goodwill impairment by comparing the implied value of a reporting unit’s goodwill and the goodwill’s carrying amount. This guidance is effective for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted. The Company is currently in the process of evaluating the impact of the pronouncement and does not expect the adoption of this guidance to have a material impact on the consolidated financial statements. In March 2017, the FASB issued ASU 2017-07, "Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost." The amendment requires an employer to report the service cost component in the same line item or line items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the income statement separately from th

Business Acquisitions

Business Acquisitions	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Business Acquisitions	Business Acquisitions On January 20, 2017, the Company completed the acquisition of Conwed pursuant to the Equity Interest Purchase Agreement, dated as of December 14, 2016, by and among the Company, Delstar Technologies, Inc., Baldwin Enterprises, Inc., Conwed and Leucadia National Corporation. As a result of the transaction, Conwed and its subsidiaries became wholly-owned indirect subsidiaries of the Company. The acquisition of Conwed expanded and continued the diversification of SWM's global presence in advanced materials and has been integrated into the Company's AMS segment. The consideration transferred to acquire Conwed was $295.0 million in cash, subject to certain customary post-closing adjustments, plus three potential earn-out payments not to exceed $40.0 million in the aggregate, which payments are contingent upon the achievement of certain financial metrics in each of 2019, 2020 and 2021, in each case, upon the terms and subject to the conditions contained in the Purchase Agreement. The estimated fair value of the potential earn-out payments at the acquisition date was $8.6 million , for total consideration transferred of $303.6 million . The estimated fair value of the deferred contingent consideration was determined based on management's projections related to the achievement of certain financial metrics for the aforementioned years. The discount rate used to value the liability was based on specific business risk, cost of capital and other factors. The fair value of the contingent consideration was determined using significant unobservable inputs and is considered a Level 3 liability. There were no changes to the assumptions underlying the estimated fair value calculation during the year ended December 31, 2017 . As of December 31, 2017 , the balance of the contingent liability was $9.5 million , including $0.9 million in accretion year-to-date. The purchase price for Conwed was funded from the Company’s borrowings under the First Amendment to Second Amended and Restated Credit Agreement, while the purchase price for Conwed NV was funded from cash on hand. See Note 13 . Debt, for additional information. The consideration paid for Conwed and the final fair values of the assets acquired and liabilities assumed as of the January 20, 2017 acquisition date were as follows ($ in millions): Fair Value as of January 20, 2017 Cash and cash equivalents $ 3.3 Accounts receivable 15.4 Inventory 20.6 Other current assets 1.1 Property, plant and equipment 31.7 Identifiable intangible assets 134.4 Total assets 206.5 Accounts payable 8.2 Deferred tax liabilities 0.9 Net assets acquired 197.4 Goodwill 106.2 Total consideration $ 303.6 The Company used the income, market, or cost approach (or a combination thereof) for the valuation as appropriate, and used valuation inputs in these models and analyses that were based on market participant assumptions. Market participants are considered to be buyers and sellers in the principal or most advantageous market for the asset or liability. For certain items, the carrying amount was determined to be a reasonable approximation of fair value based on information available to SWM management. The fair value of receivables acquired from Conwed on January 20, 2017 was $15.4 million , with gross contractual amounts receivable of $15.8 million . Acquired inventories and property, plant and equipment were recorded at their fair values. Acquired intangible assets are primarily customer relationships, developed technology, trade names and non-competition agreements. The fair value of the inventory acquired from Conwed on January 20, 2017 was $20.6 million , which included a step-up in basis of $2.9 million . Finished goods and work-in-process inventory was valued using the comparative sales method, which is a function of the estimated selling price less the sum of (a) any cost to complete, (b) costs of disposal, (c) holding costs and (d) a reasonable profit for allowance for the acquirer. Raw materials were valued using the replacement cost method of the cost approach. Properties acquired included manufacturing and related facilities, land and leased sites that include leasehold improvements, and machinery and equipment for use in manufacturing operations. Management valued properties using the market and cost approaches, supported where available by observable market data which included consideration of obsolescence. Intangible assets acquired included a number of customer relationships in the infrastructure, construction and industrial end-markets. In addition to these intangible assets, the Company acquired a number of patented and unpatented technologies, a number of business-to-business trade names and non-competition agreements. Management valued intangible assets using the relief from royalty, multi-period excess earnings and with-and-without methods, all forms of the income approach supported by observable market data for peer companies. The following table shows the fair values assigned to intangible assets ($ in millions): Fair Value as of January 20, 2017 Weighted-Average Amortization Period (Years) Amortizable intangible assets: Customer relationships $ 108.0 15.0 Developed technology 18.1 17.2 Non-competition agreements 1.2 7.2 Total amortizable intangible assets 127.3 Indefinite-lived intangible assets: Trade names 7.1 Indefinite Total $ 134.4 In connection with the acquisition, the Company recorded goodwill, which represents the excess of the consideration transferred over the fair value of tangible and intangible assets acquired, net of liabilities assumed. The goodwill is attributed primarily to Conwed's revenue growth and potential operational synergies from combining the SWM and Conwed businesses and workforces as well as the benefits of access to different markets and customers. Goodwill from the Conwed acquisition was assigned to the AMS reportable segment. The goodwill was determined on the basis of the fair values of the assets and liabilities identified as part of the transaction. The goodwill acquired in connection with Conwed and its domestic subsidiaries is expected to be deductible for tax purposes. The goodwill associated with Conwed NV is not expected to be deductible for tax purposes. For the years ended December 31, 2017 and 2016, the Company recognized $0.2 million and $1.4 million , respectively, in direct and indirect acquisition-related costs. For the year ended December 31, 2017, the Company incurred $0.6 million in financing costs related to the acquisition. Direct and indirect acquisition-related costs were expensed as incurred and are included in the General expense line item in the consolidated statements of income. Financing costs related to expanding the Amended Credit Agreement (as defined below) have been capitalized and will be amortized in Interest expense over the life of the Amended Credit Agreement. The amounts of Net sales and Income from continuing operations of Conwed included in the Company's consolidated income statement from the acquisition date are as follows ($ in millions): Net Sales Income from Continuing Operations January 21, 2017 - December 31, 2017 $ 141.3 $ 11.9 The amounts of the unaudited pro forma Net sales and Income from continuing operations of the combined entity had the acquisition date been January 1, 2016 are as follows ($ in millions): Net Sales Income from Continuing Operations 2017 Supplemental Pro Forma from January 1, 2017 - December 31, 2017 $ 989.8 $ 31.1 2016 Supplemental Pro Forma from January 1, 2016 - December 31, 2016 984.1 90.6 On October 28, 2015, the Company acquired Argotec Intermediate Holdings, LLC, or Argotec, through an Equity Interest Purchase Agreement entered into, by and among the Company, SWM Argotec, LLC, an indirect wholly-owned subsidiary of the Company, Argotec Intermediate Holdings Two LLC, and certain equity holders of Argotec Holdings LLC. The acquisition of Argotec expanded and diversified SWM's global presence in advanced materials and is now a part of the Company's AMS segment. Total consideration paid by the Company was $282.7 million in cash, subject to certain customary post-closing adjustments, primarily for the adjusted value of working capital at the acquisition date. The acquisition was financed using borrowings under the Company's Amended Credit Agreement, see Note 13 . Debt, for additional information. The consideration paid for Argotec and the fair values of the assets acquired and liabilities assumed as of the October 28, 2015 acquisition date were as follows ($ in millions): Fair Value as of October 28, 2015 Cash and cash equivalents $ 2.7 Accounts receivable 16.1 Inventory 16.3 Other current assets 0.1 Property, plant and equipment 15.9 Other noncurrent assets 0.9 Identifiable intangible assets 130.5 Total assets 182.5 Accounts payable 4.6 Accrued expenses 4.5 Net assets acquired 173.4 Goodwill 109.3 Cash paid $ 282.7 The Company used the income, market, or cost approach (or a combination thereof) for the valuation as appropriate, and used valuation inputs in these models and analyses that were based on market participant assumptions. Market participants are considered to be buyers and sellers in the principal or most advantageous market for the asset or liability. For certain items, the carrying amount was determined to be a reasonable approximation of fair value based on information available to SWM management. The fair value of receivables acquired from Argotec on October 28, 2015 was $16.1 million , with gross contractual amounts receivable of $16.8 million . Acquired inventories and property, plant and equipment were recorded at their fair values. Acquired intangible assets are primarily customer relationships, trade names and non-competition agreements. Properties acquired included a manufacturing and related facility, land and leased sites that include leasehold improvements, and machinery and equipment for use in manufacturing operations. Management valued properties using the cost approach supported where available by observable market data which included consideration of obsolescence. One of the properties acquired, the Argotec-Stevens facility in Easthampton, Massachusetts with an estimated fair value of $1.0 million , was held for sale as of the acquisition date and during the fourth quarter of 2015 came under contract for sale to a third party. The sale of this property was completed in April 2016 and no gain or loss was recognized on the disposition. Intangible assets acquired included trade names that are both business-to-business and business-to-consumer. In addition to these intangible assets, the Company acquired a number of customer relationships in the aeronautical, transportation, graphics, medical and industrial markets. Management valued intangible assets using the relief from royalty and multi-period excess earnings methods, both forms of the income approach supported by observable market data for peer companies. The following table shows the fair values assigned to intangible assets ($ in millions): Fair Value as of October 28, 2015 Weighted-Average Amortization Period (Years) Amortizable intangible assets: Customer relationships $ 115.9 15 Non-competition agreements 1.7 4 Indefinite-lived intangible assets: Trade names 12.9 Indefinite Total $ 130.5 In connection with the acquisition, the Company recorded goodwill, which represents the excess of the consideration transferred over the fair value of tangible and intangible assets acquired, net of liabilities assumed. The goodwill is attributed primarily to Argotec's revenue growth from combining the SWM and Argotec business and workforce as well as the benefits of access to different markets and customers. Goodwill from the Argotec acquisition was assigned to the AMS reportable segment. The goodwill from this acquisition was determined on the basis of the preliminary fair values of the assets and liabilities identified as part of the transaction and is expected to be deductible for tax purposes. In 2016 and 2015, the Company recognized $0.4 million and $1.8 million in direct and indirect acquisition-related costs. In 2015, the Company incurred $7.4 million in financing costs related to the acquisition. Direct and indirect acquisition-related costs were expensed as incurred and are included in the General Expense line item in the Consolidated Statements of Income. Financing costs related to expanding the Credit Agreement have been capitalized and will be amortized in Interest Expense over the life of the Credit Agreement. The amounts of the acquisition's Net Sales and Income from Continuing Operations included in the Company's Consolidated Statements of Income for the year ended December 31, 2015, and the unaudited pro forma Net Sales and Income from Continuing Operations of the combined entity had the acquisition date been January 1, 2015 are as follows ($ in millions): Net Sales Income from Continuing Operations Actual from October 28, 2015 - December 31, 2015 $ 22.3 $ 0.9 2015 Supplemental Pro Forma from January 1, 2015 - December 31, 2015 859.7 90.2

Discontinued Operations

Discontinued Operations	12 Months Ended
	Dec. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	Discontinued Operations The Company's former paper plant in San Pedro, Philippines has been reported as discontinued operations. This operation was previously presented as a component of the EP segment. For all periods presented, results of this plant have been removed from each individual line within the statements of income and the operating activities section of the statements of cash flow. In each case, a separate line has been added for the net results of discontinued operations. Included in Other Assets and Accrued Expenses within the Consolidated Balance Sheets were the following major classes of assets and liabilities, respectively, associated with the discontinued operations ($ in millions): December 31, 2017 December 31, 2016 Assets of discontinued operations: Current assets $ 1.0 $ 1.0 Other assets 2.4 2.5 Liabilities of discontinued operations: Current liabilities 0.1 0.1 Summary financial results of discontinued operations were as follows ($ in millions): For the Years Ended December 31, 2017 2016 2015 Net sales $ — $ — $ — Other income (expense) 0.1 — (0.7 ) Loss from discontinued operations before income taxes 0.1 — (0.7 ) Income tax (provision) benefit — — (0.1 ) Loss from discontinued operations 0.1 — (0.8 )

Accounts Receivable

Accounts Receivable	12 Months Ended
	Dec. 31, 2017
Accounts Receivable [Abstract]
Accounts Receivable	Accounts Receivable Accounts receivable are summarized as follows ($ in millions): December 31, 2017 2016 Trade receivables $ 120.2 $ 98.2 Business tax credits, including VAT 4.3 3.1 Hedge contracts receivable 4.8 1.0 Other receivables 21.1 13.6 Less allowance for doubtful accounts and sales discounts (1.0 ) (0.8 ) Total accounts receivable $ 149.4 $ 115.1

Inventories

Inventories	12 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories are valued at the lower of cost (using the First-In, First-Out and weighted average methods) or market. The Company's costs included in inventory primarily include resins, pulp, chemicals, direct labor, utilities, maintenance, depreciation, finishing supplies and an allocation of certain overhead costs. Machine start-up costs or abnormal machine shut downs are expensed in the period incurred and are not reflected in inventory. The definition of market value, with respect to all inventories, is net realizable value. The Company reviews inventories at least quarterly to determine the necessity of write-offs for excess, obsolete or unsalable inventory. The Company estimates write-offs for inventory obsolescence and shrinkage based on its judgment of future realization. These reviews require the Company to assess customer and market demand. The following schedule details inventories by major class ($ in millions): December 31, 2017 2016 Raw materials $ 50.4 $ 40.9 Work in process 21.3 23.9 Finished goods 74.2 44.9 Supplies and other 9.3 9.7 Total $ 155.2 $ 119.4

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment are stated at cost, less accumulated depreciation. Interest is capitalized as a component of the cost of construction for large projects. Expenditures for betterments are capitalized whereas normal repairs and maintenance are expensed as incurred. Property, other than land, is depreciated on a straight-line basis for financial reporting purposes. When property is sold or retired, the cost of the property and the related accumulated depreciation are removed from the balance sheet, and any gain or loss on the transaction is normally included in cost of products sold. Property, plant and equipment (and related depreciable lives) consisted of the following ($ in millions): December 31, 2017 2016 Land and improvements $ 15.3 $ 11.2 Buildings and improvements (20 to 40 years or remaining life of relevant lease) 145.1 118.5 Machinery and equipment (5 to 20 years) 621.9 526.1 Construction in progress 28.1 28.3 Gross property, plant and equipment 810.4 684.1 Less: Accumulated depreciation 448.5 376.7 Property, plant and equipment, net $ 361.9 $ 307.4 Depreciation expense was $35.7 million , $29.4 million and $30.7 million for the years ended December 31, 2017 , 2016 , and 2015 , respectively. During 2015, the physical assets of our RTL facility in the Philippines were reclassified from Property, plant and equipment, net to Assets held for sale on our Consolidated Balance Sheets. At December 31, 2017 , the net realizable value of these assets was $12.8 million .

Joint Ventures (Notes)

Joint Ventures (Notes)	12 Months Ended
	Dec. 31, 2017
Joint Ventures [Abstract]
Equity Method Investments and Joint Ventures Disclosure [Text Block]	Joint Ventures The Company has two joint ventures with China National Tobacco Corporation, or CNTC. CNTC is the principal operating Company under China’s State Tobacco Monopoly Administration. CNTC and the Company’s subsidiary, Schweitzer-Mauduit International China, Limited, or SM-China, each own 50% of each of the joint ventures. The paper joint venture China Tobacco Mauduit (Jiangmen) Paper Industry Co. LTD, or CTM, produces tobacco-related papers in China. The second joint venture China Tobacco Schweitzer (Yunnan) Reconstituted Tobacco Co. LTD, or CTS, produces reconstituted tobacco leaf products. The joint ventures pay to each the Company and CNTC sales-based royalties and management fees, of which SWM recognized $2.1 million , $2.0 million and $2.9 million in 2017 , 2016 and 2015 , respectively, in other income, net in the consolidated statements of income. The Company uses the equity method to account for its ownership interest in both joint ventures. At December 31, 2017 and 2016 , the Company’s equity investment in joint ventures was $68.5 million and $63.8 million , respectively. The Company’s share of the net income (loss) was included in income (loss) from equity affiliates within the consolidated statements of income. Below is summarized balance sheet information as of December 31, 2017 and 2016 , and statement of operations information of the China joint ventures for the years ended December 31, 2017 , 2016 and 2015 ($ in millions): December 31, 2017 2016 Current assets $ 112.4 $ 118.6 Noncurrent assets 205.3 201.7 Current liabilities 64.8 69.6 Long-term liabilities 114.7 122.0 Stockholder's equity 138.2 128.7 Summary financial results of joint ventures were as follows ($ in millions): For the Years Ended December 31, 2017 2016 2015 Net sales $ 105.0 $ 107.5 $ 122.0 Gross profit 28.8 36.5 42.7 Net income 4.9 9.5 13.2

Goodwill

Goodwill	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	Goodwill The Company evaluates goodwill for impairment at least annually during the fourth quarter. The annual tests during the fourth quarters of 2017 , 2016 and 2015 resulted in no impairment. Each of the Company's two reportable segments, AMS and EP, have goodwill. There are no accumulated impairment losses in the AMS segment as of December 31, 2017 . The EP segment has recorded $2.7 million in accumulated impairment losses in previous years. The changes in the carrying amount of goodwill for each reportable segment were as follows ($ in millions): Advanced Materials & Structures Engineered Papers Total Goodwill as of December 31, 2015 $ 228.5 $ 4.8 $ 233.3 Goodwill adjusted during the year (0.2 ) — (0.2 ) Foreign currency translation adjustments (3.5 ) (0.1 ) (3.6 ) Goodwill as of December 31, 2016 $ 224.8 $ 4.7 $ 229.5 Goodwill acquired during the year 106.2 — 106.2 Foreign currency translation adjustments 5.1 0.5 5.6 Goodwill as of December 31, 2017 $ 336.1 $ 5.2 $ 341.3

Other Assets

Other Assets	12 Months Ended
	Dec. 31, 2017
Other Assets [Abstract]
Other Assets	Other Assets Other assets consisted of the following ($ in millions): December 31, 2017 2016 Capitalized software costs, net of accumulated amortization $ 7.4 $ 4.4 Business tax credits, including VAT and ICMS (net of $10.6 million and $11.5 million reserve as of December 31, 2017 and 2016, respectively) 2.4 2.5 Grantor trust assets 12.2 10.3 Net pension assets 4.6 — Long-term supplies inventory 7.0 6.0 Other assets 5.9 4.3 Total $ 39.5 $ 27.5 The Company's ICMS credits in Brazil are fully reserved. These credits do not expire. The Company is still exploring other actions to utilize the credits. Charges and credits associated with normal ongoing activity are included in Cost of Products Sold in the Consolidated Statements of Income. Future material changes as a result of new legislation or a change in our operations will be reported separately. Grantor trust assets consist primarily of cash surrender values in Company-owned life insurance policies held by a trust to be used for the eventual payment of employee deferred compensation. These assets are restricted from Company use until all obligations are satisfied.

Intangible Assets

Intangible Assets	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	Intangible Assets The gross carrying amount and accumulated amortization for intangible assets consisted of the following ($ in millions): December 31, 2017 Gross Carrying Amount Accumulated Amortization Accumulated Impairments Accumulated Foreign Exchange Net Carrying Amount Amortized Intangible Assets Advanced Materials & Structures Customer relationships $ 276.3 $ 32.9 $ — $ (2.3 ) $ 245.7 Developed technology 34.0 6.0 — (0.1 ) 28.1 Customer contracts 0.9 0.9 — — — Trade names 21.8 0.8 20.7 0.3 — Non-compete agreements 2.9 1.1 — — 1.8 Patents 1.5 0.3 — — 1.2 Total $ 337.4 $ 42.0 $ 20.7 $ (2.1 ) $ 276.8 Unamortized Intangible Assets (Advanced Materials & Structures) Trade names $ 20.0 $ — $ — $ (0.4 ) $ 20.4 December 31, 2016 Gross Carrying Amount Accumulated Amortization Accumulated Impairments Accumulated Foreign Exchange Net Carrying Amount Amortized Intangible Assets Advanced Materials & Structures Customer relationships $ 168.3 $ 15.9 $ — $ 3.1 $ 149.3 Developed technology 15.9 3.6 — 0.4 11.9 Customer contracts 0.9 0.9 — — — Trade names 21.8 — 20.7 0.3 0.8 Non-compete agreements 1.7 0.5 — — 1.2 Patents 1.5 0.2 — — 1.3 Engineered Papers Customer-related intangibles 10.0 10.0 — — — Total $ 220.1 $ 31.1 $ 20.7 $ 3.8 $ 164.5 Unamortized Intangible Assets (Advanced Materials & Structures) Trade names $ 12.9 $ — $ — $ (0.1 ) $ 13.0 Amortization expense of intangible assets was $20.9 million , $12.3 million and $5.6 million for the years ended December 31, 2017 , 2016 and 2015 , respectively. Incremental amortization expense of intangible assets for the Conwed acquisition was $8.2 million for the year ended December 31, 2017 . Finite-lived intangibles in the AMS segment are expensed using the straight-line amortization method. In our AMS segment, the Company made a strategic decision to transition away from certain legacy business trade names associated with its recent acquisitions in favor of a streamlined SWM branding approach. As a result of adopting this branding strategy, in the fourth quarter of 2016, the Company recognized an impairment expense of $20.7 million , representing a write-down of the DelStar trade name intangible asset to its fair market value, leaving a remaining balance of $0.8 million , which was fully amortized over the first six months of 2017, as the DelStar trade name is phased out. The carrying value of the DelStar trade name has been reclassified from Unamortized Intangible Assets to Amortized Intangible assets in the table above as of December 31, 2016. The following table shows the estimated aggregate amortization expense for the next five years ($ in millions): For the year ended December 31, Estimated Amortization Expense 2018 $ 20.7 2019 20.6 2020 20.3 2021 20.3 2022 20.2

Restructuring and Impairment Ac

Restructuring and Impairment Activities	12 Months Ended
	Dec. 31, 2017
Restructuring and Related Activities [Abstract]
Restructuring and Impairment Activities	Restructuring and Impairment Activities The Company incurred restructuring and impairment expenses of $8.1 million , $25.6 million and $14.6 million in the years ended December 31, 2017 , 2016 and 2015 , respectively. The Company incurred $2.7 million , $21.3 million and reversed $0.2 million in restructuring and impairment expenses during the years ended December 31, 2017 , 2016 and 2015 , respectively, within the AMS segment. Restructuring and impairment expense for the year ended December 31, 2017 consisted of $2.6 million in severance accruals for employees at our U.S. and Belgium manufacturing operations, as well as $0.1 million in impairment charges at one of our U.S. manufacturing facilities. During 2016, $20.7 million of the expense in the AMS segment was attributable to the impairment of the DelStar trade name, as discussed in Note 10 . Intangible Assets. The remaining amount in 2016 and the total expense in 2015 related to accruals for severance incurred during the acquisition of the assets from Smith & Nephew in December 2014. In the EP segment, restructuring and impairment expenses were $5.3 million , $4.0 million and $14.4 million during the years ended December 31, 2017 , 2016 and 2015 , respectively. During 2017, restructuring and impairment expenses in the EP segment consisted of $0.8 million in severance accruals for employees at our manufacturing facilities in the U.S. and France, as well as an impairment charge of $4.0 million at our Philippines RTL location, and impairment charges totaling $0.5 million at our French and United States manufacturing facilities. In 2016, restructuring and impairment expenses in the EP segment consisted of $3.4 million related to severance expenses in the French, Brazilian and U.S. operations for ongoing accruals over the remaining service lives of affected employees related to previously announced actions as well as $0.6 million of impairment charges to certain of the Company's manufacturing equipment in Poland and Brazil. In 2015, restructuring and impairment expenses in the EP segment consisted of $7.8 million related to severance expenses in the French, Brazilian and U.S. operations for ongoing accruals over the remaining service lives of affected employees related to previously announced actions as well as $1.4 million of impairment charges to certain of the Company's Polish and Brazilian manufacturing equipment and $5.2 million of loss recognized to adjust the recorded value of equipment at the Philippines RTL location to its estimated fair value less cost to sell as discussed in more detail below. The fair value of the RTL Philippines facility was determined by using independent appraisals of certain assets, which are considered significant unobservable inputs, or Level 3 inputs. Additionally, the Company incurred $0.1 million , $0.3 million , and $0.4 million in 2017 , 2016 , and 2015 , respectively, in restructuring expenses related to accruals for severance expenses within supporting overhead departments which were not allocated to a specific segment. Restructuring liabilities were classified within Accrued expenses in each of the Consolidated Balance Sheets as of December 31, 2017 and 2016 . Changes in the restructuring liabilities, substantially all of which are employee-related, are summarized as follows ($ in millions): 2017 2016 Balance at beginning of year $ 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 Long-lived assets to be sold are classified as held for sale in the period in which all of the following criteria are met: management, having the authority to approve the action, commits to a plan to sell the assets; the asset are available for immediate sale in present condition subject only to terms that are usual and customary for sales of such assets; an active program to locate a buyer and other actions required to complete the plan to sell the assets have been initiated; the sale of the assets is probable, and transfer of the assets is expected to qualify for recognition as a completed sale within one year, except if events or circumstances beyond our control extend the period of time required to sell the assets beyond one year; the assets are being actively marketed for sale at a price that is reasonable in relation to current fair value; and actions required to complete the plan indicate that it is unlikely that significant changes to the plan will be made or that the plan will be withdrawn. A long-lived asset that is classified as held for sale is initially measured at the lower of its carrying value or fair value less any costs to sell. Any loss resulting from this measurement is recognized in the period in which the held for sale criteria are met. Conversely, gains are not recognized on the sale of a long-lived asset until the date of sale. The fair value of a long-lived asset less any costs to sell is assessed each reporting period it remains classified as held for sale and any reduction in fair value is reported as an adjustment to the carrying value of the asset. Upon being classified as held for sale, depreciation is ceased. Long-lived assets to be disposed of other than by sale are continued to be depreciated. Upon determining that a long-lived asset meets the criteria to be classified as held for sale, the assets and liabilities of the disposal group, if material, are reported in the line item "Assets held for sale" in our condensed consolidated balance sheets. In early 2015, the Company made the decision to dispose of the Company’s mothballed RTL facility and related equipment in the Philippines. These assets are included in the EP segment. During 2015, the Company reclassified the equipment at this location, along with the land and building associated with the property, from Property, plant and equipment, net, to Assets held for sale on the consolidating balance sheets. The reclassifications were made for all assets that are expected to be sold within one year of the balance sheet date and, as of December 31, 2015, all of the physical assets of this entity were classified as Assets held for sale. As discussed above, during the year ended December 31, 2015, the Company incurred $5.2 million in impairment expense to write-down the carrying value of these assets to the net realizable value. Additional impairment charges of $4.0 million were recognized on these assets during the year ended December 31, 2017. There were no impairment charges related to these assets recorded during 2016.

Debt

Debt	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Debt	Debt Total debt, net of debt issuance costs, is summarized in the following table ($ in millions): December 31, December 31, Term loan A-1 $ 60.0 $ 60.0 Term loan A-2 244.4 246.9 Revolving credit agreement - U.S. dollar borrowings 344.5 131.0 Revolving credit agreement - Euro borrowings 26.4 — French employee profit sharing 9.1 9.5 Long-term capital lease obligations 4.1 — Other 1.5 — Debt issuance costs (5.8 ) (7.0 ) Total debt 684.2 440.4 Less: Current debt (5.1 ) (3.0 ) Long-term debt $ 679.1 $ 437.4 Credit Agreement On December 1, 2016, the Company entered into the First Amendment to Second Amended and Restated Credit Agreement ("First Amendment") with JPMorgan Chase Bank, N.A. as administrative agent. Under the terms of the First Amendment, and effective upon the closing of the Conwed acquisition on January 20, 2017, the Company's maximum net debt to EBITDA ratio, as defined in the First Amendment, calculated on a trailing four fiscal quarter basis, is required to be not greater than 4.25 at December 31, 2017, reducing to 4.00 after December 31, 2017, 3.75 after March 31, 2018, 3.50 after June 30, 2018 and 3.00 after December 31, 2018. On October 28, 2015 Schweitzer-Mauduit International, Inc. entered into a Second Amended and Restated Credit Agreement, or the Amended Credit Agreement, with JPMorgan Chase Bank, N.A., as administrative agent, providing for credit facilities in the aggregate principal amount of $1 billion , consisting of a $650 million revolving credit facility, or Revolving Credit Facility available to the Company; a $100 million Term Loan A-1 (“Term Loan A-1”) made to the Company; and a $250 million Term Loan A-2 (“Term Loan A-2” and, together with Term Loan A-1, the “Term Loans”) made to the Company. The Revolving Credit Facility matures on October 28, 2020 . The Term Loan A-1 amortizes at the rate of 5.0% for the first two years, at the rate of 10.0% for the final three years and matures on October 28, 2020 . The Term Loan A-2 amortizes at the rate of 1.0% per year and matures on October 28, 2022 . The Term Loans are generally subject to mandatory repayment out of the net cash proceeds of asset sales which are not reinvested in operating assets. The credit facilities are secured by substantially all of the personal property of the Company and its domestic subsidiaries. In December 2015, the Company prepaid the full amount of amortization for Term Loan A-1, which totaled $40 million . The interest rate margins applicable to the Revolving Credit Facility and the Term Loans under the Amended Credit Agreement are based on a fluctuating rate of interest measured by reference to either, at the Company's option, (i) a base rate, plus an applicable margin, which ranges from 0.25% to 1.50% , in the case of the Revolving Credit Facility and Term Loan A-1, and from 0.50% to 1.75% , in the case of Term Loan A-2, or (ii) an adjusted London interbank offered rate (adjusted for maximum reserves) (“LIBOR”), plus an applicable margin, which ranges from 1.25% to 2.50% , in the case of the Revolving Credit Facility and Term Loan A-1, and from 1.50% to 2.75% , in the case of Term Loan A-2. The applicable margin, in each case, is adjusted from time to time based on the Company's ratio of net debt to EBITDA as defined by the Amended Credit Agreement. As of December 31, 2017 , the average applicable interest rate on Amended Credit Agreement borrowings was 3.60% on US Revolving Credit Facility borrowings, 2.00% on Euro Revolving Credit Facility borrowings, 3.63% on Term Loan A-1 borrowings and 3.88% on Term Loan A-2 borrowings. The Amended Credit Agreement also contains representations and warranties which are customary for facilities of this type. The Company was in compliance with all of its covenants under the Amended Credit Agreement at December 31, 2017. French Employee Profit Sharing At both December 31, 2017 and 2016 , long-term debt other than the Amended Credit Agreement primarily consisted of obligations of the French operations related to government-mandated profit sharing. Each year, representatives of the workers at each of the French businesses can make an election for the profit sharing amounts from the most recent year ended to be invested in a financial institution or with their respective employer. To the extent that funds are invested with the Company, these amounts bear interest at 1.15% and 0.80% at December 31, 2017 and 2016 , respectively, and are generally payable in the fifth year subsequent to the year in which the profit sharing is accrued. Bank Overdrafts The Company also had bank overdraft facilities of $20.0 million and $27.3 million , at December 31, 2017 and 2016 , respectively, of which none was outstanding at either December 31, 2017 or 2016 . Interest is incurred on outstanding amounts at market rates and was 0.24% and 0.14% , respectively, at December 31, 2017 and 2016 . No commitment fees are paid on the unused portion of these facilities. Rate Swap Agreements The Company maintained a forward interest rate swap agreement on a portion of its long-term debt as of December 31, 2017 that will fix the LIBOR rate on $50.0 million of the Company's variable-rate long-term debt as of October 2014 at a predetermined rate plus a credit spread through the end of October 2018. See Note 14 . Derivatives for more information. On January 20, 2017, the Company entered into an interest rate swap transaction with a major financial institution for a three -year term on a notional amount of $315 million . The interest rate swap is intended to manage the Company's interest rate risk by fixing the interest rate on a portion of the Company's debt currently outstanding under its credit facility that was previously subject to a floating interest rate equal to 1-month LIBOR plus a credit spread. The swap provides for the Company to pay a fixed rate of 1.65% per annum in addition to the credit spread on such portion of its outstanding debt in exchange for receiving a variable interest rate based on 1-month LIBOR. On January 20, 2017, the Company also entered into a three -year cross-currency swap with a major financial institution designated as a hedge of a portion of the Company's net investment in certain Euro-denominated subsidiaries. The terms of the cross-currency swap provide for an exchange of principal on a notional amount of $100 million swapped to €93.7 million at maturity. The Company will receive from our swap counterparty U.S. dollar interest at a fixed rate of 1.65% per annum and pay to our swap counterparty Euro interest at a fixed rate of -0.18% per annum. Principal Repayments Under the Amended Credit Agreement, the Company selects an "interest period" for each of its borrowings from the Revolving Credit Facility. The Company can repay such borrowings and borrow again at a subsequent date if it chooses to do so, providing it flexibility and efficient use of any excess cash. The Company currently has the intent and ability to allow its debt balances to remain outstanding and expects to continue to file notices of continuation related to its borrowings outstanding at December 31, 2017 such that those amounts are not expected to be repaid prior to the December 2020 expiration of the Revolving Credit Facility. Following are the expected maturities for the Company's debt obligations as of December 31, 2017 ($ in millions): 2018 $ 6.9 2019 5.2 2020 434.6 2021 4.4 2022 236.0 Thereafter 2.9 Total $ 690.0 Fair Value of Debt At December 31, 2017 and 2016 , the estimated fair values of the Company's current and long-term debt approximated the respective carrying amounts, as the interest rates were variable and based on current market indices. Debt Issuance Costs In conjunction with the First Amendment, the Company capitalized approximately $0.6 million in deferred debt issuance costs which will be amortized over the term of the related debt instruments. In conjunction with the Amended Credit Agreement, the Company capitalized approximately $7.4 million , in the fourth quarter of 2015, in deferred debt issuance costs associated with the new facility which will be amortized over the term of the related debt instruments. As of December 31, 2017 and 2016 , the Company's total deferred debt issuance costs totaled $5.8 million and $7.0 million , respectively. Amortization expense of $1.8 million and $1.7 million was recorded during the years ended December 31, 2017 and 2016 , respectively, and has been included as a component of Interest Expense in the accompanying Consolidated Statements of Income. Following is the expected future amortization of the Company's deferred debt issuance costs as of December 31, 2017 ($ in millions): 2018 $ 1.8 2019 1.8 2020 1.6 2021 0.3 2022 0.3 Total $ 5.8

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	Derivatives In the normal course of business, the Company is exposed to foreign currency exchange rate risk and interest rate risk on its variable-rate debt. To manage these risks, the Company utilizes a variety of practices including, where considered appropriate, derivative instruments. The Company has no derivative instruments for trading or speculative purposes or any derivatives with credit risk-related contingent features. All derivative instruments used by the Company are either exchange traded or are entered into with major financial institutions in order to reduce credit risk and risk of nonperformance by third parties. The fair values of the Company's derivative instruments are determined using observable inputs and are considered Level 2 assets or liabilities. The Company utilizes currency forward, swap and, to a lesser extent, option contracts to selectively hedge its exposure to foreign currency risk when it is practical and economical to do so. The use of these contracts minimizes transactional exposure to exchange rate changes. We designate certain of our foreign currency hedges as cash flow hedges. Changes in the fair value of cash flow hedges are reported as a component of other comprehensive income (loss) and reclassified into earnings when the forecasted transaction affects earnings. For foreign exchange contracts not designated as cash flow hedges, changes in the contracts' fair value are recorded to net income each period. The Company selectively hedges its exposure to interest rate increases on variable-rate, long-term debt when it is practical and economical to do so. Changes in the fair value of interest rate contracts considered cash flow hedges are reported as a component of other comprehensive income (loss) and reclassified into earnings when the forecasted transaction affects earnings. On January 20, 2017, the Company entered into an interest rate swap transaction with a major financial institution for a three -year term on a notional amount of $315 million . The interest rate swap is intended to manage the Company's interest rate risk by fixing the interest rate on a portion of the Company's debt currently outstanding under its credit facility that was previously subject to a floating interest rate equal to 1-month LIBOR plus a credit spread. The swap provides for the Company to pay a fixed rate of 1.65% per annum in addition to the credit spread on such portion of its outstanding debt in exchange for receiving a variable interest rate based on 1-month LIBOR. On January 20, 2017, the Company also entered into a three -year cross-currency swap with a major financial institution N.A. designated as a hedge of a portion of the Company's net investment in certain Euro-denominated subsidiaries. The terms of the cross-currency swap provide for an exchange of principal on a notional amount of $100 million swapped to €93.7 million at maturity. The Company will receive from our swap counterparty U.S. dollar interest at a fixed rate of 1.65% per annum and pay to our swap counterparty Euro interest at a fixed rate of -0.18% per annum. The following table presents the fair value of asset and liability derivatives and the respective balance sheet locations at December 31, 2017 ($ in millions): Asset Derivatives Liability Derivatives Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives Designated as Hedges: Foreign exchange contracts Accounts receivable $ 4.7 Accrued expenses $ 0.2 Foreign exchange contracts Other assets — Other liabilities 14.2 Interest rate contracts Other assets 2.0 Other liabilities — Total derivatives designated as hedges $ 6.7 $ 14.4 Derivatives not designated as hedges: Foreign exchange contracts Accounts receivable $ 0.1 Accounts payable $ — Total derivatives not designated as hedges 0.1 — Total derivatives $ 6.8 $ 14.4 The following table presents the fair value of asset and liability derivatives and the respective balance sheet locations at December 31, 2016 ($ in millions): Asset Derivatives Liability Derivatives Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives Designated as Hedges: Foreign exchange contracts Accounts receivable $ 1.0 Accrued expenses $ 1.8 Foreign exchange contracts Other assets 1.9 Other liabilities — Interest rate contracts Other assets — Other liabilities 0.4 Total derivatives designated as hedges $ 2.9 $ 2.2 The following table provides the gross effect that derivative instruments in cash flow hedging relationships had on accumulated other comprehensive income (loss), or AOCI, and results of operations ($ in millions): Derivatives Designated as Cash Flow Hedging Relationships Unrealized Gain (Loss) Recognized in AOCI on Derivatives, Net of Tax for the Year Ended December 31, Loss Reclassified from AOCI, Net of Tax 2017 2016 2015 2017 2016 2015 Foreign exchange contracts $ 1.6 $ 13.3 $ (24.4 ) $ 0.9 $ (5.9 ) $ (11.1 ) Interest rate contracts 0.4 (0.1 ) (0.5 ) (1.2 ) (0.6 ) (0.5 ) Total $ 2.0 $ 13.2 $ (24.9 ) $ (0.3 ) $ (6.5 ) $ (11.6 ) The Company's designated derivative instruments are highly effective. As such, related to the hedge ineffectiveness or amounts excluded from hedge effectiveness testing, there were no gains or losses recognized immediately in income for the years ended December 31, 2017 , 2016 or 2015 . The following table provides the effect derivative instruments not designated as hedging instruments had on net income ($ in millions): Derivatives Not Designated as Cash Flow Hedging Instruments Amount of Gain / (Loss) Recognized in Other Income / Expense 2017 2016 2015 Interest rate contracts $ — $ — $ — Foreign exchange contracts 2.7 1.0 (1.5 ) Total $ 2.7 $ 1.0 $ (1.5 )

Accrued Expenses

Accrued Expenses	12 Months Ended
	Dec. 31, 2017
Accrued Expenses [Abstract]
Accrued Expenses	Accrued Expenses Accrued expenses consisted of the following ($ in millions): December 31, 2017 2016 Accrued salaries, wages and employee benefits $ 46.9 $ 39.2 Other accrued expenses 31.7 38.0 Total $ 78.6 $ 77.2

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For financial reporting purposes, income before income taxes includes the following components ($ in millions): For the Years Ended December 31, 2017 2016 2015 United States $ 42.6 $ 27.7 $ 41.6 Foreign 58.9 65.7 63.9 Total $ 101.5 $ 93.4 $ 105.5 An analysis of the provision (benefit) for income taxes from continuing operations follows ($ in millions): For the Years Ended December 31, 2017 2016 2015 Current income taxes: U.S. federal $ 53.2 $ 14.3 $ 13.0 U.S. state 0.6 0.1 1.1 Foreign 14.2 17.2 14.2 68.0 31.6 28.3 Deferred income taxes: U.S. federal (1.3 ) (2.7 ) (5.8 ) U.S. state 2.9 (4.0 ) 0.1 Foreign — (9.5 ) (1.0 ) 1.6 (16.2 ) (6.7 ) Total $ 69.6 $ 15.4 $ 21.6 A reconciliation of income taxes computed at the U.S. Federal statutory income tax rate to the provision for income taxes is as follows ($ in millions): For the Years Ended December 31, 2017 2016 2015 Amount Percent Amount Percent Amount Percent Tax provision at U.S. statutory rate $ 35.6 35.0 % $ 32.6 35.0 % $ 36.9 35.0 % Foreign income tax rate differential 0.7 0.7 (9.0 ) (9.6 ) (16.2 ) (15.4 ) State income tax, net of federal benefit 2.7 2.6 (2.5 ) (2.7 ) 1.1 1.1 Domestic production deduction (2.4 ) (2.3 ) (0.9 ) (1.0 ) (1.5 ) (1.4 ) Remeasurement of deferred taxes for tax law change (11.8 ) (11.7 ) (7.0 ) (7.5 ) — — Adjustments to valuation allowances (2.8 ) (2.8 ) 3.5 3.7 1.4 1.3 U.S. tax reform transition tax 51.4 50.6 — — — — Other, net (3.8 ) (3.5 ) (1.3 ) (1.4 ) (0.1 ) (0.1 ) Provision for income taxes $ 69.6 68.6 % $ 15.4 16.5 % $ 21.6 20.5 % On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (the “Act”) was signed into law making significant changes to the Internal Revenue Code. Changes include, but are not limited to, a federal corporate tax rate decrease from 35% to 21% for tax years beginning after December 31, 2017. We are required to recognize the effect of the tax law changes in the period of enactment, such as determining the transition tax, remeasuring our U.S. deferred tax assets and liabilities as well as reassessing the net realizability of our deferred tax assets and liabilities. On December 22, 2017, the SEC staff issued Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act ("SAB 118"), which allows us to record provisional amounts during a measurement period not to extend beyond one year of the enactment date. In accordance with SAB 118, we have determined certain provisional amounts and reasonable estimates at December 31, 2017. The impact of the Act may differ from this estimate, possibly materially, due to, among other things, changes in interpretations and assumptions the Company has made, guidance that may be issued, and actions the Company may take as a result of the Act. In accordance with SAB 118, we have determined the provisional amounts and reasonable estimates of the transition tax and deferred tax remeasurement at December 31, 2017. The impact of the Act may differ from this estimate, possibly materially, due to, among other things, changes in interpretations and assumptions the Company has made, guidance that may be issued, and actions the Company may take as a result of the Act. We will complete our analysis over this measurement period ending December 22, 2018 and any adjustments during this measurement period will be included in net earnings from continuing operations as an adjustment to income tax expense in the reporting period when such adjustments are determined. The Company has not accounted for the tax impacts related to state taxes, the Global Intangible Low Tax Income, Base Erosion Anti Abuse Tax or Foreign Derived Intangible Income regimes or any of the other provisions of the Tax Legislation that are not effective until fiscal year 2018. Any subsequent adjustment to these amounts will be recorded to current tax expense in the quarter of 2018 when the analysis is complete. We previously considered the earnings in our non-U.S. subsidiaries to be indefinitely reinvested and, accordingly, recorded no deferred income taxes. Prior to the Transition Tax, we had an excess of the amount for financial reporting over the tax basis in our foreign subsidiaries, including undistributed foreign earnings. While the Transition Tax resulted in the reduction of the excess of the amount for financial reporting over the tax basis in our foreign subsidiaries, an actual repatriation from our non-U.S. subsidiaries could still be subject to additional foreign withholding taxes and U.S. state taxes. We have analyzed our global working capital and cash requirements and the potential tax liabilities attributable to a repatriation and have provisionally determined that we will not be repatriating any previously deemed indefinitely reinvested earnings. Net deferred income tax assets (liabilities) were comprised of the following ($ in millions): December 31, 2017 2016 Deferred Tax Assets Receivable allowances $ 0.4 $ 0.2 Reserves and accruals 3.8 3.9 Inventory and other assets 0.7 2.3 Postretirement and other employee benefits 15.9 20.0 Net operating loss and tax credit carryforwards 94.1 104.8 Intangibles 73.6 76.6 Other 4.7 0.1 193.2 207.9 Less: Valuation allowance (182.5 ) (194.8 ) Net deferred income tax assets $ 10.7 $ 13.1 Deferred Tax Liabilities Net fixed assets $ (40.5 ) $ (34.4 ) Investment in subsidiaries (9.8 ) (4.1 ) Derivatives (1.3 ) — Other (0.4 ) (0.7 ) Net deferred income tax liabilities $ (52.0 ) $ (39.2 ) Total net deferred income tax liabilities $ (41.3 ) $ (26.1 ) As of December 31, 2017 the Company had approximately $92.8 million of tax affected operating loss carryforwards available to reduce future taxable income in various jurisdictions which will expire on various dates as follows: 2017 2018-2022 $ 3.4 2023-2034 12.7 Indefinite 76.7 92.8 In addition, the Company has $1.3 million of state tax credits that will expire between 2018 - 2036. The Company's deferred tax asset valuation allowances are primarily the result of uncertainties regarding the future realization of recorded tax benefits on tax loss carryforwards for certain entities. The valuation allowance on deferred tax assets as of December 31, 2017 , in Luxembourg, Spain and the Philippines total $166.3 million , $9.1 million and $2.7 million respectively, fully reserving the net deferred tax asset balances in these locations. In addition, there is a valuation allowance on a tax credit receivable of $3.4 million in Brazil. We believe that it is more likely than not that the benefit from certain state tax attributes will not be realized. In recognition of this risk, we have provided a valuation allowance of $1.0 million on the related deferred tax assets. The Company's assumptions, judgments and estimates relative to the valuation of these net deferred tax assets take into account available positive and negative evidence of realizability, including recent financial performance, the ability to realize benefits of restructuring and other recent actions, projections of the amount and category of future taxable income and tax planning strategies. Actual future operating results and the underlying amount and category of income in future periods could differ from the Company's current assumptions, judgments and estimates. The Company believes that it will generate sufficient future taxable income to realize the tax benefits related to the remaining net deferred tax assets. The following table summarizes the activity related to the Company's unrecognized tax benefits related to income taxes ($ in millions): December 31, 2017 2016 2015 Uncertain tax position balance at beginning of year $ 2.4 $ 0.9 $ 1.8 Increases related to current year tax positions 0.3 2.0 — Increases related to prior year tax positions 0.4 — — Decreases related to prior year tax positions (2.0 ) — — Decreases related to expiration of statute of limitations (0.1 ) (0.5 ) (0.9 ) Uncertain tax position balance at end of year $ 1.0 $ 2.4 $ 0.9 The liability for unrecognized tax benefits included $1.1 million as of December 31, 2017 that if recognized would impact the Company's effective tax rate. We believe that it is reasonably possible that a decrease of up to approximately $0.2 million in unrecognized tax benefits may be recognized by the end of 2018 as a result of a lapse of the statute of limitations and other regulatory filings. The Company's policy with respect to penalties and interest in connection with income tax assessments or related to unrecognized tax benefits is to classify penalties as provision for income taxes and interest as interest expense in its Consolidated Statements of Income. There were no material income tax penalties or interest accrued during the years ended December 31, 2017 , 2016 and 2015 . The Company files income tax returns, including returns for its subsidiaries, with federal, state, local and foreign jurisdictions. Currently, the company is under U.S. audit for tax years 2014 and 2015. The following tax years remain subject to examination by the respective major tax jurisdictions: Jurisdiction Fiscal Years Belgium 2014-2016 Brazil 2012-2016 Canada 2010-2016 China 2014-2016 France 2015-2016 Germany 2013-2016 Hong Kong 2011-2016 Luxembourg 2013-2016 Philippines 2014-2016 Poland 2012-2016 Spain 2013-2016 United Kingdom 2011-2016 United States Federal 2014-2016 State 2014-2016

Postretirement and Other Benefi

Postretirement and Other Benefits	12 Months Ended
	Dec. 31, 2017
Retirement Benefits [Abstract]
Postretirement and Other Benefits	Postretirement and Other Benefits North American Pension and Postretirement Healthcare and Life Insurance Benefits The U.S. operations have defined benefit retirement plans that cover certain full-time employees. Retirement benefits are based on either a cash balance benefit formula or a final average pay formula for certain employees who were "grandfathered" and retained retirement benefits under the terms of the plan prior to its amendment to include a cash balance benefit formula. Benefits related to the U.S. defined benefit and pension plan are frozen for all employees. The U.S. operations also have unfunded healthcare and life insurance benefit plans, or OPEB plans, which cover certain of its retirees through age 65. Some employees who retained benefits under the terms of the Company's plans prior to certain past amendments receive retiree healthcare coverage at rates subsidized by the Company. For other eligible employees, retiree healthcare coverage access is offered at full cost to the retiree. The postretirement healthcare plans include a limit on the Company's share of costs for current and future retirees. The U.S. operations' retiree life insurance plans are noncontributory. The Company's Canadian postretirement benefits liability is immaterial and therefore is not included in these disclosures. French Pension Benefits In France, employees are covered under a government-administered program. In addition, the Company's French operations sponsor retirement indemnity plans, which pay a lump sum retirement benefit to all of its permanent employees who retire. In addition, the Company's French operations sponsor a supplemental executive pension plan. Plan assets are principally invested in the general asset portfolio of a French insurance company. U.S. and French Pension and U.S. Other Postretirement Benefit Disclosures The U.S. pension and OPEB plans and French pension plans accounted for the majority of the Company's total plan assets and total Accumulated Benefit Obligations (ABO) at December 31, 2017 for the Company and all of its consolidated subsidiaries. The Company uses a measurement date of December 31 for its pension plans in the United States and France and other postretirement healthcare and life insurance benefit plans in the United States. The funded status of these plans as of December 31, 2017 and 2016 was as follows ($ in millions): Pension Benefits OPEB Benefits United States France United States 2017 2016 2017 2016 2017 2016 Change in Projected Benefit Obligation, or PBO: PBO at beginning of year $ 123.2 $ 123.4 $ 32.4 $ 32.2 $ 1.4 $ 1.7 Service cost — — 1.1 1.0 — — Interest cost 4.8 5.2 0.4 0.4 0.1 0.1 Actuarial (gain) loss 3.9 2.4 (2.6 ) 2.1 0.2 — Participant contributions — — — — 0.1 0.1 Gross benefits paid (7.8 ) (7.8 ) (5.7 ) (3.0 ) (0.4 ) (0.5 ) Currency translation effect — — 4.9 (0.3 ) — — PBO at end of year $ 124.1 $ 123.2 $ 30.5 $ 32.4 $ 1.4 $ 1.4 Change in Plan Assets: Fair value of plan assets at beginning of year 118.9 116.7 6.1 8.4 — — Actual return on plan assets 17.6 10.0 0.2 0.1 — — Employer contributions — — 1.9 0.7 0.3 0.4 Participant contributions — — — — 0.1 0.1 Gross benefits paid (7.8 ) (7.8 ) (5.6 ) (2.9 ) (0.4 ) (0.5 ) Currency translation effect — — 0.6 (0.2 ) — — Fair value of plan assets at end of year $ 128.7 $ 118.9 $ 3.2 $ 6.1 $ — $ — Funded status at end of year $ 4.6 $ (4.3 ) $ (27.3 ) $ (26.3 ) $ (1.4 ) $ (1.4 ) The PBO, ABO and fair value of pension plan assets for the Company's U.S. and French defined benefit pension plans as of December 31, 2017 and 2016 as follows ($ in millions): United States France 2017 2016 2017 2016 PBO $ 124.1 $ 123.2 $ 30.5 $ 32.4 ABO 124.1 123.2 25.6 28.2 Fair value of plan assets 128.7 118.9 3.2 6.1 As of December 31, 2017 , the pre-tax amounts in accumulated other comprehensive income that have not been recognized as components of net periodic benefit cost for the U.S. and French pension plans and other postretirement benefit plans in the United States are as follows ($ in millions): Pension Benefits OPEB Benefits United States France United States Accumulated loss $ 27.1 $ 12.5 $ 0.6 Prior service credit — (3.4 ) (0.2 ) Accumulated other comprehensive loss $ 27.1 $ 9.1 $ 0.4 The amounts in accumulated other comprehensive loss at December 31, 2017 , which are expected to be recognized as components of U.S. and French net periodic benefit cost in 2018 are as follows ($ in millions): Pension Benefits OPEB Benefits United States France United States Amortization of accumulated loss $ (3.5 ) $ (1.1 ) $ (0.3 ) Amortization of prior service credit — 0.3 0.1 Total $ (3.5 ) $ (0.8 ) $ (0.2 ) Actuarial assumptions are used to determine the Company's benefit obligations. The discount rate represents the interest rate used to determine the present value of future cash flows currently expected to be required to settle pension obligations. The discount rate fluctuates from year to year based on current market interest rates for high-quality, fixed-income investments. The Company also evaluates the expected average duration of its pension obligations in determining its discount rate. An assumed long-term rate of compensation increase is also used to determine the PBO. The weighted average assumptions used to determine benefit obligations as of December 31, 2017 and 2016 were as follows: Pension Benefits OPEB Benefits United States France United States 2017 2016 2017 2016 2017 2016 Discount rate 3.60 % 4.11 % 1.14 % 1.12 % 3.59 % 4.09 % Rate of compensation increase — % — % 1.75 % 1.90 % 3.50 % 3.50 % The U.S. postretirement healthcare plan provides for benefits to be limited to a cost ceiling which has already been reached. Therefore, no increases in the health care cost trend rates are included in the measurement of the plan's benefit obligation. The components of net pension and OPEB benefit costs for U.S. employees and net pension benefit costs for French employees during the years ended December 31, 2017 , 2016 and 2015 were as follows ($ in millions): U.S. Pension Benefits French Pension Benefits U.S. OPEB Benefits 2017 2016 2015 2017 2016 2015 2017 2016 2015 Service cost $ — $ — $ — $ 1.1 $ 1.0 $ 1.3 $ — $ — $ — Interest cost 4.8 5.2 5.0 0.4 0.4 0.4 0.1 0.1 0.1 Expected return on plan assets (6.4 ) (6.8 ) (7.0 ) (0.2 ) (0.2 ) (0.3 ) — — — Amortizations and other 3.2 3.8 5.1 1.4 1.1 0.2 0.2 0.2 (0.2 ) Net periodic benefit cost $ 1.6 $ 2.2 $ 3.1 $ 2.7 $ 2.3 $ 1.6 $ 0.3 $ 0.3 $ (0.1 ) Assumptions are used to determine net periodic benefit costs. In addition to the discount rate and rate of compensation increase, which are used to determine benefit obligations, an expected long-term rate of return on plan assets is also used to determine net periodic pension benefit costs. The weighted average assumptions used to determine net periodic benefit costs for the years ended December 31, 2017 , 2016 and 2015 were as follows: Pension Benefits OPEB Benefits United States France United States 2017 2016 2015 2017 2016 2015 2017 2016 2015 Discount rate 4.11 % 4.40 % 3.94 % 1.14 % 1.12 % 1.43 % 4.09 % 4.29 % 3.82 % Expected long-term rate of return on plan assets 5.56 % 5.83 % 6.06 % 3.00 % 3.00 % 3.00 % — % — % — % Rate of compensation increase — % — % — % 1.75 % 1.90 % 1.90 % 3.50 % 3.50 % 3.50 % The Company's investment strategy with respect to its U.S. pension plan assets is to maximize the return on investment of plan assets at an acceptable level of risk and to assure the plans' fiscal health. The target asset allocation varies based on the funded status of the plan in an effort to match the duration of the plan's liabilities to investments in long duration fixed income assets over time. The Company's investments under the French pension plans are primarily invested as directed by governmental authorities, their contracted providers or the participants without direction from the Company. The primary goal of the Company's pension plans is to maintain the highest probability of assuring future benefit payments to participants while providing growth of capital in real terms. To achieve this goal, the investment philosophy is to protect plan assets from large investment losses, particularly over time, while steadily growing the assets in a prudent manner. While there cannot be complete assurance that the objectives will be realized, the Company believes that the likelihood of realizing the objectives are reasonable based upon this investment philosophy. The Company has an investment committee that meets on a periodic basis to review the portfolio returns and to determine asset mix targets. The U.S. and French pension plans' asset target allocations by asset category for 2018 and actual allocations by asset category at December 31, 2017 and 2016 were as follows: United States France 2018 Target 2017 2016 2017 2016 Asset Category Cash and cash equivalents 1 % 1 % 1 % 38 % 24 % Equity securities* Domestic large cap 7 7 7 31 20 Domestic small cap 4 4 5 — — International 20 20 20 — — Fixed income securities 68 68 67 28 54 Alternative investments** — — — 3 2 Total 100 % 100 % 100 % 100 % 100 % * None of the Company's pension plan assets are targeted for investment in SWM stock, except that it is possible that one or more mutual funds held by the plan could hold shares of SWM. ** Investments in this category under the U.S. pension plan only may include hedge funds, and may include real estate under the French pension plan. The Company's pension assets are classified according to an established fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurements). A financial instrument's level within the hierarchy is based on the lowest level of any input that is significant to the fair value measurement. The three levels of the fair value hierarchy are described below: Level 1 Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; Level 2 Quoted prices in markets that are not considered to be active or financial instruments for which all significant inputs are observable, either directly or indirectly; Level 3 Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable. The following table sets forth by level, within the fair value hierarchy, the U.S. and French pension plans' assets at fair value as of December 31, 2017 ($ in millions): United States France Plan Asset Category Total Other* Level 1 Level 2 Level 3 Total Level 1 Level 2 Cash equivalents $ 1.1 $ — $ 1.1 $ — $ — $ 1.2 $ 1.2 $ — Equity securities Domestic large cap 9.0 9.0 — — — 1.0 1.0 — Domestic small cap 5.8 5.8 — — — — — — International 25.3 25.3 — — — — — — Fixed income securities 87.4 31.1 — 56.3 — 0.9 — 0.9 Alternative investments** 0.1 — — — 0.1 0.1 — 0.1 Total $ 128.7 $ 71.2 $ 1.1 $ 56.3 $ 0.1 $ 3.2 $ 2.2 $ 1.0 The following table sets forth by level, within the fair value hierarchy, the U.S. and French pension plans' assets at fair value as of December 31, 2016 ($ in millions): United States France Plan Asset Category Total Other* Level 1 Level 2 Level 3 Total Level 1 Level 2 Cash equivalents $ 1.2 $ — $ 1.2 $ — $ — $ 1.5 $ 1.5 $ — Equity securities Domestic large cap 8.3 8.3 — — — 1.2 1.2 — Domestic small cap 5.7 5.7 — — — — — — International 23.7 23.7 — — — — — — Fixed income securities 79.9 79.9 — — — 3.2 — 3.2 Alternative investments** 0.1 — — — 0.1 0.2 — 0.2 Total $ 118.9 $ 117.6 $ 1.2 $ — $ 0.1 $ 6.1 $ 2.7 $ 3.4 * Assets are measured at NAV as a practical expedient and not subject to hierarchy level classification disclosure. ** Alternative investments include ownership interests in shares of registered investment companies. Values for Level 3 assets may be determined through appraisals and models for illiquid assets. The following table shows the changes in Level 3 asset values ($ in millions): U.S. Level 3 Asset Reconciliation Alternative Investments Total Beginning balance, January 1, 2016 $ 0.3 Realized and unrealized gains — Purchases — Sales (0.2 ) Ending balance, December 31, 2016 $ 0.1 Realized and unrealized gains — Purchases — Sales — Ending balance, December 31, 2017 $ 0.1 The Company expects the following estimated undiscounted future pension benefit payments for the United States and France and future postretirement healthcare and life insurance benefit payments for the United States, which are to be made from pension plan and employer assets, net of amounts that will be funded from retiree contributions, and which reflect expected future service, as appropriate ($ in millions): United States France Pension Benefits Healthcare and Life Insurance Benefits Pension Benefits 2018 $ 8.5 $ 0.2 $ 1.4 2019 8.4 0.1 2.1 2020 8.3 0.1 0.7 2021 8.3 0.1 1.3 2022 8.2 0.1 0.9 2023 - 2027 39.1 0.3 7.7 The Company is not required to contribute during 2018 to its U.S. and French pension plans; although, it may make discretionary contributions dependent on market conditions to remain aligned with its investment policy statement. Other Foreign Pension Benefits In Brazil, Poland and the United Kingdom, employees are covered under government-administered programs. In Canada, the employee pension benefits are not significant and therefore are not included in the above disclosures. Other Benefits We sponsor a qualified defined contribution plan covering substantially all U.S. employees. Under the plan, the Company matches a portion of employee contributions. The Company's cost under the plan was $3.6 million , $2.5 million and $2.5 million for the years ended December 31, 2017 , 2016 and 2015 , respectively. The Company provides U.S. executives, certain other key personnel and its directors the opportunity to participate in deferred compensation plans. Participating employees can elect to defer a portion of their salaries and certain other compensation. Participating directors can elect to defer their meeting fees, as a cash deferral, as well as their quarterly retainer fees, as deferred stock unit credits. The Company's liability balance under these deferred compensation plans totaled $17.4 million and $15.4 million at December 31, 2017 and 2016 , respectively, which were included in the Consolidated Balance Sheets in other liabilities. In connection with these plans, the Company has a grantor trust into which it has contributed funds toward its future obligations under the various plans (See Note 11 . Other Assets). The balance of grantor trust assets totaled $12.2 million and $10.3 million at December 31, 2017 and 2016 , respectively, which were included in Other assets in the Consolidated Balance Sheets. These assets are restricted from Company use until all obligations are satisfied. In accordance with French law, certain salaried employees in France may accumulate unused regular vacation and supplemental hours of paid leave that can be credited to an individual's Compte Epargne Temps, or CET. The CET account may grow over an individual's career and the hours accumulated may be withdrawn upon retirement or under other special circumstances at the individual's then current rate of pay. The balance of the Company's liability for this program reflected in the accompanying Consolidated Balance Sheets in Other liabilities was $5.6 million and $5.3 million at December 31, 2017 and 2016 , respectively.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2017
Stockholders' Equity Note [Abstract]
Stockholders' Equity	Stockholders' Equity Restricted Stock Plan In April 2015, the Company adopted a new 2015 Long-term Incentive Plan, or LTIP, which replaced its existing Restricted Stock Plan ("RSP"). The LTIP is intended to promote the Company's long-term financial success by attracting and retaining outstanding executive personnel and to motivate such personnel by means of equity grants. The Compensation Committee of the Company's Board of Directors selects participants and establishes the terms of any grant of restricted stock. The Company's LTIP provides that issuance of restricted stock immediately transfers ownership rights in shares of its Common Stock to the recipient of the grant, including the right to vote the shares and to receive dividends thereon. Other types of stock awards are available under the LTIP, but not currently used. The recipient's continued ownership of and right to freely transfer the restricted stock is subject to such conditions on transferability and to such risks of forfeiture as are established by the Compensation Committee at the time of the grant, which may include continued employment with the Company for a defined period, achievement of specified management performance objectives or other conditions established by the Compensation Committee. The number of shares which may be issued under the LTIP is limited to 5,000,000 . Restricted shares outstanding under the RSP will continue to vest in accordance with the terms of each grant, however, no further grants of shares will be issued under the RSP. No single participant may be awarded, in the aggregate, more than 750,000 shares during any fiscal year. As of December 31, 2017 , 1,584,454 restricted shares had been issued under the Company's restricted stock plans of which 283,338 shares of issued restricted stock were not yet vested and for which $2.0 million in unrecognized compensation expense is expected to be recognized over a weighted average period of 2.4 years. The following table presents restricted stock activity for the years 2017 , 2016 and 2015 : 2017 2016 2015 # of Shares Weighted Average Fair Value at Date of Grant # of Shares Weighted Average Fair Value at Date of Grant # of Shares Weighted Average Fair Value at Date of Grant Nonvested restricted shares outstanding at January 1 224,289 $ 41.30 197,674 $ 43.56 366,363 $ 38.24 Granted 216,017 36.03 150,647 39.47 107,346 45.34 Forfeited (29,150 ) 42.50 (51,234 ) 43.56 (39,322 ) 40.93 Vested (127,818 ) 41.06 (72,798 ) 42.06 (236,713 ) 36.57 Nonvested restricted shares outstanding at December 31 283,338 $ 37.26 224,289 $ 41.30 197,674 $ 43.56 Restricted Stock Plan Performance Based Shares During 2017 , the Company recognized $1.7 million for 75,741 shares earned under the 2017-2018 award opportunity and $2.2 million of compensation expense earned under the 2016-2017 award opportunity. During 2016 , the Company recognized $2.8 million for 167,961 shares earned under the 2016-2017 award opportunity and $1.5 million of compensation expense earned under the 2015-2016 award opportunity. During 2015 , the Company recognized $1.8 million of compensation expense for 71,228 shares earned under the 2015-2016 award opportunity and $0.6 million of compensation expense earned under the 2014-2015 award opportunity. Basic and Diluted Shares Reconciliation The Company uses the two-class method to calculate earnings per share. The Company has granted restricted stock that contains nonforfeitable rights to dividends on unvested shares. Since these unvested shares are considered participating securities under the two-class method, the Company allocates earnings per share to common stock and participating securities according to dividends declared and participation rights in undistributed earnings. Diluted net income per common share is computed based on net income divided by the weighted average number of common and potential common shares outstanding. Potential common shares during the respective periods are those related to dilutive stock-based compensation, including long-term share-based incentive compensation, stock options outstanding, and directors' accumulated deferred stock compensation which may be received by the directors in the form of stock or cash. A reconciliation of the average number of common and potential common shares outstanding used in the calculations of basic and diluted net income per share follows ($ in millions, shares in thousands): For the Years Ended December 31, 2017 2016 2015 Numerator (basic and diluted): Net income $ 34.5 $ 82.8 $ 89.7 Less: Dividends paid to participating securities (0.4 ) (0.3 ) (0.2 ) Less: Undistributed earnings available to participating securities — (0.2 ) (0.3 ) Undistributed and distributed earnings available to common stockholders $ 34.1 $ 82.3 $ 89.2 Denominator: Average number of common shares outstanding 30,407.1 30,310.9 30,251.4 Effect of dilutive stock-based compensation 142.2 152.5 122.9 Average number of common and potential common shares outstanding 30,549.3 30,463.4 30,374.3

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Leases Future minimum obligations under non-cancelable operating leases having an initial or remaining term in excess of one year as of December 31, 2017 are as follows ($ in millions): 2018 $ 6.2 2019 5.2 2020 4.8 2021 4.2 2022 3.7 Thereafter 9.7 Total $ 33.8 Rental expense under operating leases was $6.4 million during 2017 , $6.9 million during 2016 and $6.8 million during 2015 . Other Commitments The EP segment's PDM Industries plant has a minimum annual commitment of approximately $1.6 million per year for calcium carbonate purchases, a raw material used in the manufacturing of some paper products, which totals approximately $10.9 million through 2024. Future purchases are expected to be at levels that exceed such minimum levels under these contracts. The Company enters into certain other immaterial contracts from time to time for the purchase of certain raw materials. The Company also enters into certain contracts for the purchase of equipment and related costs in connection with its ongoing capital projects. The Company has agreements with an energy co-generation supplier in France whereby the supplier constructed and operates a co-generation facility at certain plants and supplies steam that is used in the operation of these plants. The Company is committed to purchasing minimum annual amounts of steam generated by these facilities under the agreements through 2020 . These minimum annual commitments total approximately $1.6 million . The Company's current and expected requirements for steam at these facilities are at levels that exceed the minimum levels under the contracts. The EP segment's Brazilian plant, SWM-B, has an agreement for the transmission and distribution of energy that covers all of the plant's consumption of electrical energy valued at approximately $3.4 million annually through 2020 . The French plants have contracts for natural gas to be distributed to and consumed at PdM, LTRI and St. Girons. The value of the natural gas and distribution to be provided under these contracts is estimated at approximately $3.0 million in 2018. The Spay, France plant has a contract to consume biomass at approximately $2.1 million for each of the next two years. The Company has certain other letters of credit, guarantees and surety bonds outstanding at December 31, 2017 , which are not material either individually or in the aggregate. Litigation Brazil Imposto sobre Circulação de Mercadorias e Serviços, or ICMS, a form of value-added tax in Brazil, was assessed to our Brazilian subsidiary Schweitzer-Mauduit do Brasil Indústria e Comércio de Papel Ltda. ("SWM-B") in December of 2000. SWM-B received two assessments from the tax authorities of the State of Rio de Janeiro for unpaid ICMS taxes on certain raw materials from January 1995 through November 2000, collectively the Raw Materials Assessment. The Raw Materials Assessments concerned the accrual and use by SWM-B of ICMS tax credits generated from the production and sale of certain non-tobacco related grades of paper sold domestically. SWM-B has contested the Raw Materials Assessments based on Article 150, VI of the Brazilian Federal Constitution of 1988, which grants immunity from ICMS taxes to papers intended for printing books, newspapers and periodicals, or immune papers, and thus to the raw material inputs used to produce immune papers. One of the two assessments, or Assessment 1 (case number 2001.001.115144-5), related in part to tax periods that predated our acquisition of the Pirahy plant in Pirai, Brazil. In October 2015, the Federal Supreme Court of Brazil denied the State’s appeal of Assessment 1, in the amount of approximately $16 million , a decision which is now final. The second assessment, or Assessment 2 (case number 2001.001.064544-6), pertains exclusively to periods that SWM-B owned the Pirahy plant. Assessment 2 in the amount of approximately $13 million remains pending before the Federal Supreme Court of Brazil on SWM-B’s appeal on the merits and is likely to be finally decided by the action of the chamber of the court hearing the matter. No docket entry has been made yet regarding argument on Assessment 2. SWM-B received assessments from the tax authorities of the State of Rio de Janeiro for unpaid ICMS and Fundo Estadual de Combate à Pobreza ("FECP", a value-added tax similar to ICMS) taxes on interstate purchases of electricity. The state issued three sets of assessments against SWM-B, one for May 2006 - November 2007, a second for January 2008 - December 2010, and a third for September 2011 - September 2013 (collectively the "Electricity Assessments"). SWM-B has challenged all three Electricity Assessments in administrative proceedings before the state tax council (in the first-level court Junta de Revisão Fiscal and the appellate court Conselho de Contribuintes) based on Resolution 1.610/89, which defers these taxes on electricity purchased by an "electricity-intensive consumer." In October and November 2014, a majority of the Conselho de Contribuintes sitting en banc ruled against SWM-B in each of the first and second electricity assessments. The State issued notices to SWM-B to pay approximately $6 million in connection with the first electricity assessment and $9 million in connection with the second electricity assessment, in each case based on the foreign currency exchange rate at December 31, 2017 . SWM-B filed separate challenges to these electricity assessments in further court proceedings in the state judicial system, and different chambers of the judicial court granted SWM-B preliminary injunctions against enforcement. In March and July 2017, the first-level judicial court ruled that SWM-B must present additional evidence that it is an "electricity-intensive consumer" concerning the first and second electricity assessments. SWM-B is now pursuing these actions. SWM-B's challenge to the third electricity assessment (approximately $4 million as of December 31, 2017 ) was decided adversely to SWM-B at the first administrative level (Junta de Revisão Fiscal) and has been appealed to the Conselho de Contribuintes. The State issued a new regulation effective January 1, 2018 that only specific industries are “electricity-intensive consumers,” a list that excludes paper manufacturers. SWM-B believes that both the remaining Raw Materials Assessment and the Electricity Assessments will ultimately be resolved in its favor. No liability has been recorded in our consolidated financial statements for these assessments based on our evaluation of these matters under the facts and law as presently understood. The Company can give no assurance as to the ultimate outcome of such proceedings. France In December 2016, the Conseil de Prud’hommes d’Orange (a French court dealing with labor matters) rendered a decision by which the Company’s wholly owned subsidiary, Schweitzer Mauduit France (“SWM France”), was ordered to pay approximately €1.3 million to 18 former employees of Malaucène Industries, another wholly owned subsidiary, on the grounds, among other things, that SWM France was a “co-employer” of the plaintiffs, and, as a result, liable for certain obligations of Malaucène Industries with respect to such employees. Malaucène Industries stopped production in 2009. The Company believes that SWM France, which is a corporate holding company and indirect corporate parent of Malaucène Industries, is not a “co-employer” of any person and that the other claims are also without merit. The Company has no liability recorded in the consolidated financial statements for this matter, believing that the chances of SWM France to reverse the decision on appeal are sufficient that no such reserve is warranted. There can be no assurance, however, that the court of appeals will decide in favor of SWM France on any of the questions pending before the court. Environmental Matters The Company's operations are subject to various nations' federal, state and local laws, regulations and ordinances relating to environmental matters. The nature of the Company's operations exposes it to the risk of claims with respect to various environmental matters, and there can be no assurance that material costs or liabilities will not be incurred in connection with such claims. While the Company has incurred in the past several years, and will continue to incur, capital and operating expenditures in order to comply with environmental laws and regulations, it believes that its future cost of compliance with environmental laws, regulations and ordinances, and its exposure to liability for environmental claims and its obligation to participate in the remediation and monitoring of certain hazardous waste disposal sites, will not have a material effect on its financial condition or results of operations. However, future events, such as changes in existing laws and regulations, or unknown contamination of sites owned, operated or used for waste disposal by the Company (including contamination caused by prior owners and operators of such sites or other waste generators) may give rise to additional costs which could have a material effect on its financial condition or results of operations. The Company incurs spending necessary to meet legal requirements and otherwise relating to the protection of the environment at its facilities in the United States, France, Poland, Brazil, China and Canada. For these purposes, the Company incurred total capital expenditures of $1.1 million in 2017 , and expects to incur less than $1.0 million in each of 2018 and 2019, of which no material amount is the result of environmental fines or settlements. The foregoing capital expenditures are not expected to reduce the Company's ability to invest in other appropriate and necessary capital projects and are not expected to have a material adverse effect on its financial condition or results of operations. Indemnification Matters In connection with its spin-off from Kimberly-Clark in 1995, the Company undertook to indemnify and hold Kimberly-Clark harmless from claims and liabilities related to the businesses transferred to it that were not identified as excluded liabilities in the related agreements. As of December 31, 2017 , there are no claims pending under this indemnification that the Company deems to be material. General Matters In the ordinary course of conducting business activities, the Company and its subsidiaries become involved in certain other judicial, administrative and regulatory proceedings involving both private parties and governmental authorities. These proceedings include insured and uninsured regulatory, employment, intellectual property, general and commercial liability, environmental and other matters. At this time, the Company does not expect any of these proceedings to have a material effect on its reputation, business, financial condition, results of operations or cash flows. However, the Company can give no assurance that the results of any such proceedings will not materially affect its reputation, business, financial condition, results of operations or cash flows.

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Segment Information	Segment Information The Company's two operating product line segments are also the Company's reportable segments: Advanced Materials and Structures and Engineered Papers. The AMS segment primarily produces engineered resin-based rolled goods such as nets, films, and other non-wovens for use in high-performance applications in the filtration, infrastructure and construction, transportation, medical, and industrial end-markets. It consists of the operations of DelStar, the December 2014 acquisitions, Argotec and Conwed. The EP segment primarily produces cigarette papers including LIP papers, plug wrap papers and base tipping papers used to wrap various parts of a cigarette for sale to cigarette manufacturers and reconstituted tobacco leaf, or RTL, and wrapper and binder products for sale to cigarette and cigar manufacturers. The EP segment also includes commercial and industrial products such as lightweight printing and writing papers, battery separator paper, drinking straw wrap, filter paper and other specialized papers. Information about Net Sales and Operating Profit The Company primarily evaluates segment performance and allocates resources based on operating profit. Expense amounts not associated with segments are referred to as unallocated expenses. ($ in millions) Net Sales For the Years Ended December 31, 2017 2016 2015 Advanced Materials & Structures $ 433.2 44.1 % $ 280.6 33.4 % $ 180.2 23.6 % Engineered Papers 548.9 55.9 559.3 66.6 583.9 76.4 Consolidated $ 982.1 100.0 % $ 839.9 100.0 % $ 764.1 100.0 % ($ in millions) Operating Profit For the Years Ended December 31, 2017 2016 2015 Advanced Materials & Structures $ 48.5 38.9 % $ 9.0 8.5 % $ 16.7 16.2 % Engineered Papers 116.1 93.1 138.0 130.0 121.5 118.0 Unallocated (39.9 ) (32.0 ) (40.9 ) (38.5 ) (35.2 ) (34.2 ) Consolidated $ 124.7 100.0 % $ 106.1 100.0 % $ 103.0 100.0 % ($ in millions) Segment Assets December 31, 2017 December 31, 2016 December 31, 2015 Advanced Materials & Structures $ 811.7 $ 569.3 $ 648.4 Engineered Papers 537.6 505.1 507.3 Unallocated 193.2 99.3 134.3 Consolidated $ 1,542.5 $ 1,173.7 $ 1,290.0 ($ in millions) Capital Spending Depreciation 2017 2016 2015 2017 2016 2015 Advanced Materials & Structures $ 11.5 $ 10.1 $ 11.2 $ 12.3 $ 7.1 $ 5.5 Engineered Papers 25.6 17.6 12.5 23.4 22.3 25.6 Unallocated 0.1 0.1 0.5 — — (0.4 ) Consolidated $ 37.2 $ 27.8 $ 24.2 $ 35.7 $ 29.4 $ 30.7 Information about Geographic Areas Long-lived assets by geographic area as of year-end were as follows ($ in millions): Long-Lived Assets 2017 2016 2015 United States $ 115.0 $ 89.6 $ 87.5 France 181.3 162.7 163.5 Brazil 24.2 23.7 20.1 Poland 21.9 20.0 23.6 Other foreign countries 26.9 15.8 15.9 Consolidated $ 369.3 $ 311.8 $ 310.6 For the geographic disclosure in the following table, net sales are attributed to geographic locations based on the location of the Company's direct customers ($ in millions): Net Sales 2017 2016 2015 United States $ 468.9 $ 372.2 $ 310.7 Europe and the former Commonwealth of Independent States 259.9 253.2 261.2 Asia-Pacific (including China) 148.4 129.4 118.5 Latin America 57.9 47.4 34.6 Other foreign countries 47.0 37.7 39.1 Consolidated $ 982.1 $ 839.9 $ 764.1

Major Customers

Major Customers	12 Months Ended
	Dec. 31, 2017
Major Customers [Abstract]
Major Customers	Major Customers There were no individual customers in the AMS segment which made up 10% or more of the Company's 2017 , 2016 or 2015 consolidated net sales. In our EP segment, two customers, together with their respective affiliates and designated converters, each accounted for more than 10% or more of the Company's consolidated net sales and together accounted for 23% of the Company's consolidated net sales for the year ended December 31, 2017 . For the year ended December 31, 2016, one customer, together with its respective affiliates and designated converters, accounted for 18% of the Company's consolidated net sales. Philip Morris-USA, British American Tobacco and Japan Tobacco Inc. together with their respective affiliates and designated converters, each accounted for 10% or more of the Company's consolidated net sales in 2015 and together accounted for 42% of the Company's 2015 consolidated net sales. The loss of one or more such customers, or a significant reduction in one or more of these customers' purchases, could have a material adverse effect on the Company's results of operations. There were no individual customers in the AMS segment which made up 10% or more of the Company's consolidated accounts receivable at December 31, 2017 or 2016 . In the EP segment, one customer, together with its respective affiliates and designated converters, accounted for 12% of the Company's consolidated accounts receivable at December 31, 2017 . There were no customers that accounted for 10% or more of consolidated accounts receivable at December 31, 2016 .

Supplemental Disclosures

Supplemental Disclosures	12 Months Ended
	Dec. 31, 2017
SUPPLEMENTAL DISCLOSURES [Abstract]
Supplemental Disclosures	Supplemental Disclosures Analysis of Allowances for Doubtful Accounts: ($ in millions) For the Years Ended December 31, 2017 2016 2015 Allowance for Doubtful Accounts Beginning balance $ 0.8 $ 0.4 $ 0.3 Bad debt expense 0.8 0.4 0.2 Write-offs and discounts (0.6 ) — (0.1 ) Currency translation — — — Ending balance $ 1.0 $ 0.8 $ 0.4 Supplemental Cash Flow Information ($ in millions) For the Years Ended December 31, 2017 2016 2015 Interest paid $ 22.7 $ 13.3 $ 7.8 Income taxes paid 38.1 31.9 9.3 Capital spending in accounts payable and accrued liabilities 7.7 8.8 2.6 Deferred contingent business acquisition consideration 8.6 — —

Quarterly Financial Information

Quarterly Financial Information (Unaudited)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information (Unaudited)	Quarterly Financial Information (Unaudited) The following tables summarize the Company's unaudited quarterly financial data for the years ended December 31, 2017 and 2016 ($ in millions, except per share amounts): 2017 First Quarter Second Quarter Third Quarter Fourth Quarter Year Net sales $ 233.3 $ 255.3 $ 257.8 $ 235.7 $ 982.1 Gross profit 63.1 76.6 75.8 66.8 282.3 Restructuring and impairment expense 1.1 1.6 1.5 3.9 8.1 Operating profit 26.6 39.5 38.5 20.1 124.7 Income (loss) from continuing operations 13.7 22.3 25.7 (27.3 ) 34.4 Income from discontinued operations — — 0.1 — 0.1 Net (loss) income $ 13.7 $ 22.3 $ 25.8 $ (27.3 ) $ 34.5 Net income (loss) per share: Income (loss) per share from continuing operations - basic $ 0.45 $ 0.73 $ 0.84 $ (0.90 ) $ 1.12 Income per share from discontinued operations - basic — — — — — Net income (loss) per share - basic $ 0.45 $ 0.73 $ 0.84 $ (0.90 ) $ 1.12 Income (loss) per share from continuing operations - diluted $ 0.45 $ 0.72 $ 0.84 $ (0.89 ) $ 1.12 Income per share from discontinued operations - diluted — — — — — Net income (loss) per share - diluted $ 0.45 $ 0.72 $ 0.84 $ (0.89 ) $ 1.12 2016 First Quarter Second Quarter Third Quarter Fourth Quarter Year Net sales $ 214.6 $ 217.3 $ 209.3 $ 198.7 $ 839.9 Gross profit 63.5 66.9 63.1 63.2 256.7 Restructuring and impairment expense 1.8 0.9 1.3 21.6 25.6 Operating profit 31.6 37.5 30.8 6.2 106.1 Income from continuing operations 21.1 26.0 18.7 17.0 82.8 (Loss) income from discontinued operations — — — — — Net income $ 21.1 $ 26.0 $ 18.7 $ 17.0 $ 82.8 Net income per share: Income per share from continuing operations - basic $ 0.69 $ 0.85 $ 0.62 $ 0.55 $ 2.71 (Loss) income per share from discontinued operations - basic — — — — — Net income per share - basic $ 0.69 $ 0.85 $ 0.62 $ 0.55 $ 2.71 Income per share from continuing operations - diluted $ 0.69 $ 0.85 $ 0.61 $ 0.55 $ 2.70 (Loss) income per share from discontinued operations - diluted — — — — — Net income per share - diluted $ 0.69 $ 0.85 $ 0.61 $ 0.55 $ 2.70

Summary of Significant Accoun32

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying consolidated financial statements and the notes thereto have been prepared in accordance with accounting principles generally accepted in the United States of America, or U.S. GAAP. The preparation of financial statements in conformity with U.S. GAAP requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting periods. The Company believes the estimates and assumptions used in the preparation of these consolidated financial statements are reasonable, based upon currently available facts and known circumstances. Actual results may differ from those estimates and assumptions as a result of a number of factors, including those discussed elsewhere in this report and in its other public filings from time to time.
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include the accounts of the Company and wholly-owned, majority-owned and controlled subsidiaries. Intercompany balances and transactions have been eliminated. Certain reclassifications of prior year data were made in the notes to consolidated financial statements. The reclassifications were made to conform to the current year presentation. The Company uses the equity method to account for its investments in two joint ventures with the China National Tobacco Corporation (see Note 8 . Joint Ventures). Investment in equity affiliates represents the Company’s investment in these joint ventures. The Company’s 50% share of the net income (loss) of the joint ventures is included in the consolidated statements of income as income (loss) from equity affiliates.
Revenue Recognition	Revenue Recognition The Company recognizes revenue and the related accounts receivable when the following four criteria are met: (1) persuasive evidence of an arrangement exists; (2) ownership has transferred to the customer; (3) the selling price is fixed or determinable; and (4) collection is reasonably assured based on the Company's judgment regarding the collectability of its accounts receivable. Generally, the Company recognizes revenue when it ships its manufactured product and title and risk of loss passes to its customer in accordance with the terms of sale of the product. Revenue is recorded at the time of shipment for terms designated free on board, shipping point, or equivalent. For sales transactions designated free on board, destination, or equivalent, revenue is recorded when the product is delivered to the customer's delivery site, at which time title and risk of loss are transferred. Provisions for discounts, returns, allowances, customer rebates and other adjustments are provided for in the same period the related revenue is recorded. Deferred revenue represents advance payments from customers which are earned based upon a mutually agreed-upon amount per unit of future product sales. Freight Costs The cost of delivering finished goods to the Company's customers is recorded as a component of cost of products sold. Those costs include the amounts paid to a third party to deliver the finished goods. Any freight costs billed to and paid by a customer are included in revenue. Royalty Income Royalties from third-party patent licenses are recognized when earned, including monies received at an agreement's initiation attributable to past sales. The Company recognizes up-front payments upon receipt when it has no future performance requirement or ongoing obligation arising from its agreements and the payment is for a separate earnings process. Minimum annual royalties received in advance are deferred and are recognized in the period earned.
Foreign Currency Translation	Foreign Currency Translation The income statements of foreign entities are translated into U.S. dollars at average exchange rates prevailing during the periods presented. The balance sheets of these entities are translated at period-end exchange rates, and the differences from historical exchange rates are reflected in a separate component of accumulated other comprehensive income (loss) as unrealized foreign currency translation adjustments. Foreign currency risks arise from transactions and balances denominated in non-local currencies.
Derivative Instruments	Derivative Instruments The Company is exposed to changes in foreign currency exchange rates, interest rates and commodity prices. The Company utilizes a variety of practices to manage these market risks, including where considered appropriate, derivative instruments. The Company uses derivative instruments only for risk management purposes and not for trading or speculation. All derivative instruments the Company uses are either exchange traded or are entered into with major financial institutions in order to reduce credit risk and risk of nonperformance by third parties. The Company believes the credit risks with respect to the counterparties, and the foreign currency risks that would not be hedged if the counterparties fail to fulfill their obligations under the contracts, are not material in view of its understanding of the financial strength of the counterparties. Gains and losses on instruments that hedge firm commitments are deferred and included in the basis of the underlying hedged items. All other hedging gains and losses are included in period income or expense based on the period-end market price of the instrument and are included in the Company's operating cash flows. See Note 14 . Derivatives, for additional information.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all highly liquid, unrestricted investments with remaining maturities of three months or less to be cash equivalents, including money market funds with no restrictions on withdrawals.
Business Combinations	Business Combinations The Company uses the acquisition method of accounting for business combinations. At the acquisition date, the Company records assets acquired and liabilities assumed at their respective fair market values. The Company estimates fair value using the exit price approach which is the price that would be received to sell an asset or paid to transfer a liability in an orderly market. An exit price is determined from a market participant's viewpoint in the principal or most advantageous market and may result in the Company valuing assets or liabilities at a fair value that is not reflective of the Company's intended use of the assets or liabilities. Any excess consideration above the estimated fair values of the net assets acquired is recognized as goodwill on the Company's Consolidated Balance Sheets. The operating results of acquired businesses are included in the Company's results of operations beginning as of their effective acquisition dates.
Impairment of Long-Lived Assets, Goodwill and Intangible Assets	Impairment of Long-Lived Assets, Goodwill and Intangible Assets The Company evaluates the carrying value of long-lived assets, including property and equipment, goodwill and intangible assets when events and circumstances warrant a review. Goodwill is also tested for impairment annually during the fourth quarter. Goodwill may be evaluated using a qualitative evaluation and/or a two-step test at the reporting unit level. The first step compares the book value of the reporting unit to its fair value. If the book value of a reporting unit exceeds its fair value, the Company performs the second step. In the second step, the Company determines an implied fair value of the reporting unit's goodwill by allocating the fair value of the reporting unit to all of the assets and liabilities other than goodwill. The difference between the total fair value of the reporting unit and the fair value of all the assets and liabilities other than goodwill is the implied fair value of that goodwill. Any impairment loss is measured as the excess of the book value of the goodwill over the implied fair value of that goodwill. See Note 9 . Goodwill for further discussion of the Company's annual impairment test results. During the annual testing in the fourth quarter of 2017 , the estimated fair value of each of the Company's reporting units was in excess of its respective carrying value. We have acquired trade names that have been determined to have indefinite lives. We evaluate a number of factors to determine whether an indefinite life is appropriate, including the competitive environment, category share, business history, product life cycle and operating plans. Indefinite-lived intangibles are evaluated for impairment annually during the fourth quarter. Additionally, when certain events or changes in operating conditions occur, an impairment assessment is performed and indefinite-lived trade names may be adjusted to a determinable life or an impairment charge may be recorded. In the fourth quarter of 2016, the Company made a strategic decision to transition away from certain legacy business trade names associated with our recent acquisitions in favor of a streamlined SWM branding approach. As a result, during the fourth quarter of 2016, the Company recognized an impairment loss related to the DelStar trade name, the financial impact of which is described in Note 10 . Intangible Assets. The cost of intangible assets with determinable useful lives is amortized to reflect the pattern of economic benefits consumed, which approximates a straight-line basis, over the estimated periods benefited. When certain events or changes in operating conditions occur, an impairment assessment is performed and lives of intangible assets with determinable lives may be adjusted. The carrying value of long-lived assets is reviewed to determine if events or circumstances have changed which may indicate that the assets may be impaired or the useful life may need to be changed. Upon occurrence of such a triggering event, the Company considers internal and external factors relating to each asset group, including expectation of future profitability, undiscounted cash flows and its plans with respect to the operations. If impairment is indicated, an impairment loss is measured by the amount the net carrying value of the asset exceeds its estimated fair value.
Environmental Spending	Environmental Spending Environmental spending is capitalized if such spending qualifies as property, plant and equipment, substantially increases the economic value or extends the useful life of an asset. All other such spending is expensed as incurred, including fines and penalties incurred in connection with environmental violations. Environmental spending relating to an existing condition caused by past operations is expensed. Liabilities are accrued when environmental assessments are probable and the costs can be reasonably estimated. Generally, timing of these accruals coincides with completion of a feasibility study or commitment to a formal plan of action.
Capitalized Software Costs	Capitalized Software Costs The Company capitalizes certain purchases of software and software development costs in connection with major projects of software development for internal use. These costs are included in Other assets on the Consolidated Balance Sheets and are amortized using the straight-line method over the estimated useful life not to exceed seven years . Costs associated with business process redesign, end-user training, system start-up and ongoing software maintenance are expensed as incurred.
Business Tax Credits	Business Tax Credits Business tax credits represent value added tax credits receivable and similar assets, such as Imposto sobre Circulação de Mercadorias e Serviços, or ICMS, in Brazil. Business tax credits are generated when value-added taxes, or VAT, are paid on purchases. VAT and similar taxes are collected from customers on certain sales. In some jurisdictions, export sales do not require VAT collection. See Note 11 . Other Assets for additional information.
Income Taxes	Income Taxes The Company accounts for income taxes under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements. Under this method, deferred tax assets and liabilities are determined on the basis of the differences between the financial statement and tax bases of assets and liabilities by using enacted tax rates in effect for the year in which the differences are expected to reverse. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date. The Company recognizes deferred tax assets to the extent that it believes that these assets are more likely than not to be realized. In making such a determination, all available positive and negative evidence is considered, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies, and results of recent operations. If it is determined that the Company would be able to realize the deferred tax assets in the future in excess of their net recorded amount, an adjustment would be made to the deferred tax asset valuation allowance, which would reduce the provision for income taxes. The Company records uncertain tax positions in accordance with ASC 740 on the basis of a two-step process in which (1) it is determined whether it is more likely than not that the tax positions will be sustained on the basis of the technical merits of the position and (2) for those tax positions that meet the more-likely-than-not recognition threshold, the Company recognizes the largest amount of tax benefit that is more than 50 percent likely to be realized upon ultimate settlement with the related tax authority. On December 22, 2017, the 2017 Tax Cuts and Jobs Act (the “Tax Act”) was enacted into law and the new legislation contains several key tax provisions that affected SWM, which include, but are not limited to, a one-time mandatory transition tax on accumulated foreign earnings and a reduction of the corporate income tax rate from 35% to 21% effective January 1, 2018. The Company is required to recognize the effect of the tax law changes in the period of enactment, such as determining the transition tax, remeasuring U.S. deferred tax assets and liabilities as well as reassessing the net realizability of its deferred tax assets and liabilities. In December 2017, the SEC staff issued Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act (“SAB 118”), which allows the Company to record provisional amounts during a measurement period not to extend beyond one year of the enactment date. Since the Tax Act was passed late in the fourth quarter of 2017, and ongoing guidance and accounting interpretation is expected over the next 12 months, the Company considers the accounting of the transition tax, deferred tax re-measurements, and other items to be incomplete due to the forthcoming guidance and its ongoing analysis of final year-end data and tax positions. The Company expects to complete its analysis within the measurement period in accordance with SAB 118.
Pensions and Other Postretirement Benefit Accounting	Pension and Other Postretirement Benefits Accounting The Company recognizes the estimated compensation cost of employees' pension and other postretirement benefits over their approximate period of service. The Company's earnings are impacted by amounts of expense recorded related to these benefits, which primarily consist of U.S. and French pension benefits and U.S. other postretirement benefits, or OPEBs. Each year's recorded expenses are estimates based on actuarial calculations of the Company's accumulated and projected benefit obligations, or PBOs, for the Company's various plans. Suspension of additional benefits for future service is considered a curtailment, and if material, necessitates a re-measurement of plan assets and PBO. As part of a re-measurement, the Company adjusts its discount rates and other actuarial assumptions, such as retirement, turnover and mortality table assumptions, as appropriate. See Note 17 . Postretirement and Other Benefits for additional information.
Comprehensive Income	Comprehensive Income Comprehensive income includes net income, as well as items charged and credited directly to stockholders' equity, which are excluded from net income. The Company has presented comprehensive income in the Consolidated Statements of Comprehensive Income. Reclassification adjustments of derivative instruments are presented in Net sales and Interest expense in the Consolidated Statements of Income. See Note 14 . Derivatives for additional information. Amortization of accumulated pension and other post-employment benefit (OPEB) liabilities are included in the computation of net periodic pension and OPEB costs, which are more fully discussed in Note 17 . Postretirement and Other Benefits.
Restricted Stock	Restricted Stock All of the Company's restricted stock grants, including those that have been earned in the case of performance-based shares and cliff-vesting grants that are not performance based, vest upon completion of a specified period of time, typically between two and four years. The fair value of each award is equal to the share price of the Company's stock on the date of the grant. This cost is recognized over the vesting period of the respective award. The Company records forfeitures of shares related to continued service requirements as they occur. A summary of outstanding restricted stock awards as of December 31, 2017 and 2016 is included in Note 18 . Stockholders' Equity.
Restricted Stock Plan Performance Based Shares	Restricted Stock Plan Performance Based Shares The Company's long-term incentive compensation program, or LTICP, for key employees includes an equity-based award component that is provided through the Long-term Incentive Plan, or LTIP, which the Company adopted in 2015 and which replaced its previous Restricted Stock Plan, or RSP. The objectives under the LTICP are established at the beginning of a performance cycle and are intended to focus management on longer-term strategic goals. The Compensation Committee of the Board of Directors designates participants in the LTICP and LTIP and determines the equity-based award opportunity in the form of restricted stock for each performance cycle, which is generally measured on the basis of a one year performance period (the measurement period). The restricted shares are considered issued and outstanding when the number of shares becomes fixed, after the annual performance is determined, and such awards vest at the end of the performance year or some predetermined period thereafter. The Company recognizes compensation expense with an offsetting credit to additional paid-in-capital over the performance period based on the fair value of the award at the date of grant, with compensation expense being adjusted cumulatively based on the number of shares expected to be earned according to the level of achievement of performance goals.
Fair Value Option	Fair Value Option The Company has elected not to measure its financial instruments or certain commitments at fair value.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update ("ASU") 2014-09, "Revenue from Contracts with Customers" (Topic 606). This guidance specifies how and when an entity will recognize revenue arising from contracts with customers and requires entities to disclose information about the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. In August 2015, the FASB deferred the effective date for annual reporting periods beginning after December 15, 2017 (including interim reporting periods within those periods). The Company adopted this ASU effective January 1, 2018, utilizing the modified retrospective transition approach upon adoption. This approach requires an adjustment upon adoption to the financial statements to reflect the cumulative impact of the guidance and results in no change to prior period financial statements. Based on the evaluation of the provisions included in the new guidance, along with the related updates discussed below, the adoption of this guidance will not materially impact the amount or timing of revenues recognized in the consolidated financial statements or materially affect our financial position. The Company has two main sources of revenue: product sales and materials conversion. The Company recognizes product sales revenues when control of a product is transferred to the customer. For the majority of product sales, transfer of control occurs when the products are shipped from one of the Company’s manufacturing facilities to the customer. The cost of delivering finished goods to the Company’s customers is recorded as a component of cost of products sold. Those costs include the amounts paid to a third party to deliver the finished goods. Any freight costs billed to and paid by a customer are included in net sales. The Company provides services to customers in conversion of customer-owned raw materials into processed finished goods. In these transactions, the Company generally recognizes revenue as processing occurs. Revenue is recognized when obligations under the terms of a contract with a customer are satisfied, which generally occurs when control of the promised goods or services is transferred to the customer, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. Generally, the Company considers collectability of amounts due under a contract to be probable upon inception of a sale based on an evaluation of the credit worthiness of each customer. If collectability is not considered to be probable, the Company defers recognition of revenue on satisfied performance obligations until the uncertainty is resolved. Any variable consideration, such as discounts or price concessions, is set forth in the terms of the contract at inception, and is included in the assessment of the transaction price at the outset of the arrangement. The transaction price is allocated to the individual performance obligations due under the contract based on the relative stand-alone fair value of the performance obligations identified in the contract. The Company typically uses an observable price to determine the stand-alone selling price for separate performance obligations. Depending on the terms of an arrangement, the Company may defer the recognition of a portion of the consideration received or receivable, including amounts considered refundable, which is dependent on satisfaction of a future performance obligation. Incidental items that are immaterial in the context of the contract are recognized as expense in the period incurred. The Company generally expenses sales commissions and other costs to obtain a contract when incurred because the amortization period would have been one year or less. These costs are recorded within sales and marketing expenses. The Company does not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) contracts for which we recognize revenue at the amount to which we have the right to invoice for services performed. As a practical expedient, the Company treats shipping and handling activities that occur after control of the good transfers as fulfillment activities, and therefore, does not account for shipping and handling costs as a separate performance obligation. In July 2015, the FASB issued ASU 2015-11, "Inventory (Topic 330): Simplifying the Measurement of Inventory." This update requires entities to measure inventory at the lower of cost and net realizable value. Net realizable value is the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. Subsequent measurement is unchanged for inventory measured using the Last-in, First-out or the retail inventory method. This guidance is effective for annual reporting periods beginning after December 15, 2016, and interim periods thereafter. The Company adopted this guidance as of January 1, 2017. Adoption of ASU 2015-11 did not have an impact on the consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842): Amendments to the FASB Accounting Standards Codification." The new standard establishes a right-of-use model that requires a lessee to record a right-of-use asset and a lease liability on the balance sheet for all leases with terms longer than twelve months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. This guidance is effective for annual reporting periods beginning after December 15, 2018, and interim periods thereafter. Early adoption is permitted. Companies must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. The Company is currently in the process of evaluating the impact of the pronouncement on the Company's outstanding leases and expects that adoption will have an impact on the consolidated balance sheets related to recording right-of-use assets and corresponding lease liabilities. Further, the Company is currently in the process of evaluating the impact of adoption on the consolidated statements of income. In March 2016, the FASB issued ASU 2016-09, "Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting." This standard makes several modifications to existing guidance related to the accounting for forfeitures, employer tax withholding on share-based compensation and the financial statement presentation of excess tax benefits or deficiencies. ASU 2016-09 also clarifies the statement of cash flows presentation for certain components of share-based awards. This guidance is effective for annual reporting periods beginning after December 15, 2016, and interim periods thereafter. The Company adopted this guidance as of January 1, 2017. Adoption of ASU 2016-09 did not have an impact on the consolidated financial statements. In March, April and May 2016, the FASB issued ASU 2016-08, “Revenue from Contracts with Customers: Principal versus Agent Considerations (Reporting Revenue Gross versus Net),” ASU 2016-10, “Revenue from Contracts with Customers: Identifying Performance Obligations and Licensing,” ASU 2016-11, "Revenue Recognition (Topic 605) and Derivatives and Hedging (Topic 815): Rescission of SEC Guidance Because of Accounting Standards Updates 2014-09 and 2014-16 Pursuant to Staff Announcements at the March 3, 2016 EITF Meeting," and ASU 2016-12, "Revenue from Contracts with Customers: Narrow-Scope Improvements and Practical Expedients," which provide supplemental adoption guidance and clarification to ASC 2014-09. ASU 2016-08, ASU 2016-10, ASU 2016-11 and ASU 2016-12 must be adopted concurrently with the adoption of ASU 2014-09. The Company is currently in the process of finalizing the financial statement disclosures required under ASU 2014-09 that will be incorporated in the Company's Form 10-Q for the first quarter of 2018 upon adoption of the guidance but does not expect that adoption of these updates will materially affect our financial position or materially impact the amount or timing of revenues recognized in the consolidated financial statements, as discussed above. In October 2016, the FASB issued ASU 2016-16, "Income Taxes (Topic 718): Intra-Entity Transfers of Assets Other Than Inventory." This standard states that an entity should recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs, thus eliminating the exception for an intra-entity transfer of an asset other than inventory. This guidance is effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods within those annual reporting periods. Early adoption is permitted. The Company will adopt this ASU effective January 1, 2018, utilizing the modified retrospective basis transition approach upon adoption. The adoption of this guidance will result in a cumulative-effect adjustment directly to retained earnings of $2.2 million as of January 1, 2018. In January 2017, the FASB issued ASU No. 2017-01, "Business Combinations (Topic 805): Clarifying the Definition of a Business." The guidance clarifies the definition of a business with the objective of assisting entities in evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. Acquisitions of integrated sets of assets and activities that do not meet the definition of a business are accounted for as asset acquisitions. The new update is effective for annual periods beginning after December 15, 2017. The amendments in ASU 2017-01 will be implemented on a prospective basis in the first quarter of 2018 and are not expected to have a material impact on the Company's financial statements. In January 2017, the FASB issued ASU 2017-04, "Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment." The amendment eliminates the second step of the analysis that required the measurement of a goodwill impairment by comparing the implied value of a reporting unit’s goodwill and the goodwill’s carrying amount. This guidance is effective for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted. The Company is currently in the process of evaluating the impact of the pronouncement and does not expect the adoption of this guidance to have a material impact on the consolidated financial statements. In March 2017, the FASB issued ASU 2017-07, "Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost." The amendment requires an employer to report the service cost component in the same line item or line items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the income statement separately from the service cost component and outside a subtotal from operations. This guidance is effective for annual periods beginning after December 15, 2017. The Company will adopt this ASU effective January 1, 2018, utilizing the retrospective transition approach upon adoption. The adoption of this guidance will result in a reclassification of the components of net periodic pension cost, other than service cost, from Cost of products sold and General expense to Other income (expense), net, in the Consolidated Statements of Income. The reclassification of these costs effects only the EP segment, as there are no pension costs associated with the AMS segment. The adoption of this guidance will have no effect on Net income in the Consolidated Statements of Income and no effect on the other consolidated financial statements. In May 2017, the FASB issued ASU 2017-09, "Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting". This amendment clarifies the changes to terms or conditions of a share-based payment award that require an entity to apply modification accounting. ASU 2017-09 is effective for annual reporting periods, and interim periods therein, beginning after December 15, 2017. Early application is permitted and prospective application is required. The amendments in ASU 2017-09 will be implemented on a prospective basis in the first quarter of 2018 and are not expected to have a material impact on the Company's financial statements. In August 2017, the FASB issued ASU 2017-12, "Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities." This amendment better aligns an entity's risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. ASU 2017-12 is effective for annual reporting periods, and interim periods therein, beginning after December 15, 2018. Early application is permitted and should be applied to hedging relationships existing on the date of adoption. The effect of adoption should be reflected as of the beginning of the fiscal year of adoption. The Company is currently in the process of evaluating the impact of the pronouncement and does not expect the adoption of this guidance to have a material impact on the consolidated financial statements. In February 2018, the FASB issued ASU 2018-02, "Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income." In February 2018, this ASU was issued following the enactment of the Tax Cuts and Jobs Act (the "Tax Act") of 2017. This ASU allows an entity to elect a reclassification from accumulated other comprehensive income to retained earnings for stranded effects resulting from the Tax Act. ASU 2018-02 is effective for annual reporting periods, and interim periods therein, beginning after December 15, 2018. Early adoption is permitted and should be applied either in the period of adoption or retrospectively to each period in which the effect of the change in the U.S. federal corporate income tax rate in the Tax Act is recognized. The Company is currently in the process of evaluating the impact of the pronouncement and does not expect the adoption of this guidance to have a material impact on the consolidated financial statements.

Summary of Significant Accoun33

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Components of Accumulated Other Comprehensive Loss	Components of accumulated other comprehensive income (loss) were as follows ($ in millions): December 31, 2017 2016 Accumulated pension and OPEB liability adjustments, net of income tax benefit of $13.8 million and $17.6 million at December 31, 2017 and 2016, respectively $ (24.9 ) $ (36.5 ) Accumulated unrealized loss on derivative instruments, net of income tax benefit of $0.2 million and $3.0 million at December 31, 2017 and 2016, respectively 0.4 (1.9 ) Accumulated unrealized foreign currency translation adjustments, net of income tax benefit of $4.5 million and $0.0 million at December 31, 2017 and 2016, respectively (64.9 ) (100.9 ) Accumulated other comprehensive loss $ (89.4 ) $ (139.3 )
Changes in the Components of Accumulated Other Comprehensive Loss	Changes in the components of accumulated other comprehensive income (loss) were as follows ($ in millions): For the Years Ended December 31, 2017 2016 2015 Pre-tax Tax Net of Tax Pre-tax Tax Net of Tax Pre-tax Tax Net of Tax Pension and OPEB liability adjustments $ 15.4 $ (3.8 ) $ 11.6 $ 3.4 $ (4.3 ) $ (0.9 ) $ 1.9 $ 0.9 $ 2.8 Derivative instrument adjustments 5.1 (2.8 ) 2.3 23.0 (3.3 ) 19.7 (13.6 ) 0.3 (13.3 ) Unrealized foreign currency translation adjustments 31.5 4.5 36.0 (16.7 ) — (16.7 ) (54.4 ) — (54.4 ) Total $ 52.0 $ (2.1 ) $ 49.9 $ 9.7 $ (7.6 ) $ 2.1 $ (66.1 ) $ 1.2 $ (64.9 )

Business Acquisitions (Tables)

Business Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2017
Conwed Plastics LLC [Member]
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The consideration paid for Conwed and the final fair values of the assets acquired and liabilities assumed as of the January 20, 2017 acquisition date were as follows ($ in millions): Fair Value as of January 20, 2017 Cash and cash equivalents $ 3.3 Accounts receivable 15.4 Inventory 20.6 Other current assets 1.1 Property, plant and equipment 31.7 Identifiable intangible assets 134.4 Total assets 206.5 Accounts payable 8.2 Deferred tax liabilities 0.9 Net assets acquired 197.4 Goodwill 106.2 Total consideration $ 303.6
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination	The following table shows the fair values assigned to intangible assets ($ in millions): Fair Value as of January 20, 2017 Weighted-Average Amortization Period (Years) Amortizable intangible assets: Customer relationships $ 108.0 15.0 Developed technology 18.1 17.2 Non-competition agreements 1.2 7.2 Total amortizable intangible assets 127.3 Indefinite-lived intangible assets: Trade names 7.1 Indefinite Total $ 134.4
Actual and Pro Forma Net Sales and Income from Continuing Operations	The amounts of Net sales and Income from continuing operations of Conwed included in the Company's consolidated income statement from the acquisition date are as follows ($ in millions): Net Sales Income from Continuing Operations January 21, 2017 - December 31, 2017 $ 141.3 $ 11.9 The amounts of the unaudited pro forma Net sales and Income from continuing operations of the combined entity had the acquisition date been January 1, 2016 are as follows ($ in millions): Net Sales Income from Continuing Operations 2017 Supplemental Pro Forma from January 1, 2017 - December 31, 2017 $ 989.8 $ 31.1 2016 Supplemental Pro Forma from January 1, 2016 - December 31, 2016 984.1 90.6
Argotec [Member]
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The consideration paid for Argotec and the fair values of the assets acquired and liabilities assumed as of the October 28, 2015 acquisition date were as follows ($ in millions): Fair Value as of October 28, 2015 Cash and cash equivalents $ 2.7 Accounts receivable 16.1 Inventory 16.3 Other current assets 0.1 Property, plant and equipment 15.9 Other noncurrent assets 0.9 Identifiable intangible assets 130.5 Total assets 182.5 Accounts payable 4.6 Accrued expenses 4.5 Net assets acquired 173.4 Goodwill 109.3 Cash paid $ 282.7
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination	The following table shows the fair values assigned to intangible assets ($ in millions): Fair Value as of October 28, 2015 Weighted-Average Amortization Period (Years) Amortizable intangible assets: Customer relationships $ 115.9 15 Non-competition agreements 1.7 4 Indefinite-lived intangible assets: Trade names 12.9 Indefinite Total $ 130.5
Actual and Pro Forma Net Sales and Income from Continuing Operations	The amounts of the acquisition's Net Sales and Income from Continuing Operations included in the Company's Consolidated Statements of Income for the year ended December 31, 2015, and the unaudited pro forma Net Sales and Income from Continuing Operations of the combined entity had the acquisition date been January 1, 2015 are as follows ($ in millions): Net Sales Income from Continuing Operations Actual from October 28, 2015 - December 31, 2015 $ 22.3 $ 0.9 2015 Supplemental Pro Forma from January 1, 2015 - December 31, 2015 859.7 90.2

Discontinued Operations (Tables

Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Schedule of disposal groups, including discontinued operations, balance sheet	Included in Other Assets and Accrued Expenses within the Consolidated Balance Sheets were the following major classes of assets and liabilities, respectively, associated with the discontinued operations ($ in millions): December 31, 2017 December 31, 2016 Assets of discontinued operations: Current assets $ 1.0 $ 1.0 Other assets 2.4 2.5 Liabilities of discontinued operations: Current liabilities 0.1 0.1
Discontinued operations, income (loss) from discontinued operation	Summary financial results of discontinued operations were as follows ($ in millions): For the Years Ended December 31, 2017 2016 2015 Net sales $ — $ — $ — Other income (expense) 0.1 — (0.7 ) Loss from discontinued operations before income taxes 0.1 — (0.7 ) Income tax (provision) benefit — — (0.1 ) Loss from discontinued operations 0.1 — (0.8 )

Accounts Receivable (Tables)

Accounts Receivable (Tables)	12 Months Ended
	Dec. 31, 2017
Accounts Receivable [Abstract]
Schedule of Accounts Receivable	Accounts receivable are summarized as follows ($ in millions): December 31, 2017 2016 Trade receivables $ 120.2 $ 98.2 Business tax credits, including VAT 4.3 3.1 Hedge contracts receivable 4.8 1.0 Other receivables 21.1 13.6 Less allowance for doubtful accounts and sales discounts (1.0 ) (0.8 ) Total accounts receivable $ 149.4 $ 115.1

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Schedule of Inventories by Major Class	The following schedule details inventories by major class ($ in millions): December 31, 2017 2016 Raw materials $ 50.4 $ 40.9 Work in process 21.3 23.9 Finished goods 74.2 44.9 Supplies and other 9.3 9.7 Total $ 155.2 $ 119.4

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, plant and equipment (and related depreciable lives) consisted of the following ($ in millions): December 31, 2017 2016 Land and improvements $ 15.3 $ 11.2 Buildings and improvements (20 to 40 years or remaining life of relevant lease) 145.1 118.5 Machinery and equipment (5 to 20 years) 621.9 526.1 Construction in progress 28.1 28.3 Gross property, plant and equipment 810.4 684.1 Less: Accumulated depreciation 448.5 376.7 Property, plant and equipment, net $ 361.9 $ 307.4

Joint Ventures (Tables)

Joint Ventures (Tables)	12 Months Ended
	Dec. 31, 2017
Joint Ventures [Abstract]
Condensed Balance Sheet [Table Text Block]	Below is summarized balance sheet information as of December 31, 2017 and 2016 , and statement of operations information of the China joint ventures for the years ended December 31, 2017 , 2016 and 2015 ($ in millions): December 31, 2017 2016 Current assets $ 112.4 $ 118.6 Noncurrent assets 205.3 201.7 Current liabilities 64.8 69.6 Long-term liabilities 114.7 122.0 Stockholder's equity 138.2 128.7
Condensed Income Statement [Table Text Block]	Summary financial results of joint ventures were as follows ($ in millions): For the Years Ended December 31, 2017 2016 2015 Net sales $ 105.0 $ 107.5 $ 122.0 Gross profit 28.8 36.5 42.7 Net income 4.9 9.5 13.2

Goodwill (Tables)

Goodwill (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The changes in the carrying amount of goodwill for each reportable segment were as follows ($ in millions): Advanced Materials & Structures Engineered Papers Total Goodwill as of December 31, 2015 $ 228.5 $ 4.8 $ 233.3 Goodwill adjusted during the year (0.2 ) — (0.2 ) Foreign currency translation adjustments (3.5 ) (0.1 ) (3.6 ) Goodwill as of December 31, 2016 $ 224.8 $ 4.7 $ 229.5 Goodwill acquired during the year 106.2 — 106.2 Foreign currency translation adjustments 5.1 0.5 5.6 Goodwill as of December 31, 2017 $ 336.1 $ 5.2 $ 341.3

Other Assets (Tables)

Other Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Other Assets [Abstract]
Schedule of Other Assets	Other assets consisted of the following ($ in millions): December 31, 2017 2016 Capitalized software costs, net of accumulated amortization $ 7.4 $ 4.4 Business tax credits, including VAT and ICMS (net of $10.6 million and $11.5 million reserve as of December 31, 2017 and 2016, respectively) 2.4 2.5 Grantor trust assets 12.2 10.3 Net pension assets 4.6 — Long-term supplies inventory 7.0 6.0 Other assets 5.9 4.3 Total $ 39.5 $ 27.5

Intangible Assets (Tables)

Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets	The gross carrying amount and accumulated amortization for intangible assets consisted of the following ($ in millions): December 31, 2017 Gross Carrying Amount Accumulated Amortization Accumulated Impairments Accumulated Foreign Exchange Net Carrying Amount Amortized Intangible Assets Advanced Materials & Structures Customer relationships $ 276.3 $ 32.9 $ — $ (2.3 ) $ 245.7 Developed technology 34.0 6.0 — (0.1 ) 28.1 Customer contracts 0.9 0.9 — — — Trade names 21.8 0.8 20.7 0.3 — Non-compete agreements 2.9 1.1 — — 1.8 Patents 1.5 0.3 — — 1.2 Total $ 337.4 $ 42.0 $ 20.7 $ (2.1 ) $ 276.8 Unamortized Intangible Assets (Advanced Materials & Structures) Trade names $ 20.0 $ — $ — $ (0.4 ) $ 20.4 December 31, 2016 Gross Carrying Amount Accumulated Amortization Accumulated Impairments Accumulated Foreign Exchange Net Carrying Amount Amortized Intangible Assets Advanced Materials & Structures Customer relationships $ 168.3 $ 15.9 $ — $ 3.1 $ 149.3 Developed technology 15.9 3.6 — 0.4 11.9 Customer contracts 0.9 0.9 — — — Trade names 21.8 — 20.7 0.3 0.8 Non-compete agreements 1.7 0.5 — — 1.2 Patents 1.5 0.2 — — 1.3 Engineered Papers Customer-related intangibles 10.0 10.0 — — — Total $ 220.1 $ 31.1 $ 20.7 $ 3.8 $ 164.5 Unamortized Intangible Assets (Advanced Materials & Structures) Trade names $ 12.9 $ — $ — $ (0.1 ) $ 13.0
Schedule of Future Amortization Expense	The following table shows the estimated aggregate amortization expense for the next five years ($ in millions): For the year ended December 31, Estimated Amortization Expense 2018 $ 20.7 2019 20.6 2020 20.3 2021 20.3 2022 20.2

Restructuring and Impairment 43

Restructuring and Impairment Activities (Tables)	12 Months Ended
	Dec. 31, 2017
Restructuring and Related Activities [Abstract]
Changes in Restructuring Liabilities	Changes in the restructuring liabilities, substantially all of which are employee-related, are summarized as follows ($ in millions): 2017 2016 Balance at beginning of year $ 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

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Schedule of Total Debt	Total debt, net of debt issuance costs, is summarized in the following table ($ in millions): December 31, December 31, Term loan A-1 $ 60.0 $ 60.0 Term loan A-2 244.4 246.9 Revolving credit agreement - U.S. dollar borrowings 344.5 131.0 Revolving credit agreement - Euro borrowings 26.4 — French employee profit sharing 9.1 9.5 Long-term capital lease obligations 4.1 — Other 1.5 — Debt issuance costs (5.8 ) (7.0 ) Total debt 684.2 440.4 Less: Current debt (5.1 ) (3.0 ) Long-term debt $ 679.1 $ 437.4
Schedule of Maturities of Long-term Debt	Following are the expected maturities for the Company's debt obligations as of December 31, 2017 ($ in millions): 2018 $ 6.9 2019 5.2 2020 434.6 2021 4.4 2022 236.0 Thereafter 2.9 Total $ 690.0
Schedule of Amortization of Debt Issuance Costs	Following is the expected future amortization of the Company's deferred debt issuance costs as of December 31, 2017 ($ in millions): 2018 $ 1.8 2019 1.8 2020 1.6 2021 0.3 2022 0.3 Total $ 5.8

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair value of asset and liability derivatives and the respective balance sheet locations	The following table presents the fair value of asset and liability derivatives and the respective balance sheet locations at December 31, 2017 ($ in millions): Asset Derivatives Liability Derivatives Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives Designated as Hedges: Foreign exchange contracts Accounts receivable $ 4.7 Accrued expenses $ 0.2 Foreign exchange contracts Other assets — Other liabilities 14.2 Interest rate contracts Other assets 2.0 Other liabilities — Total derivatives designated as hedges $ 6.7 $ 14.4 Derivatives not designated as hedges: Foreign exchange contracts Accounts receivable $ 0.1 Accounts payable $ — Total derivatives not designated as hedges 0.1 — Total derivatives $ 6.8 $ 14.4 The following table presents the fair value of asset and liability derivatives and the respective balance sheet locations at December 31, 2016 ($ in millions): Asset Derivatives Liability Derivatives Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives Designated as Hedges: Foreign exchange contracts Accounts receivable $ 1.0 Accrued expenses $ 1.8 Foreign exchange contracts Other assets 1.9 Other liabilities — Interest rate contracts Other assets — Other liabilities 0.4 Total derivatives designated as hedges $ 2.9 $ 2.2
Schedule of cash flow hedges included in accumulated other comprehensive income (loss)	The following table provides the gross effect that derivative instruments in cash flow hedging relationships had on accumulated other comprehensive income (loss), or AOCI, and results of operations ($ in millions): Derivatives Designated as Cash Flow Hedging Relationships Unrealized Gain (Loss) Recognized in AOCI on Derivatives, Net of Tax for the Year Ended December 31, Loss Reclassified from AOCI, Net of Tax 2017 2016 2015 2017 2016 2015 Foreign exchange contracts $ 1.6 $ 13.3 $ (24.4 ) $ 0.9 $ (5.9 ) $ (11.1 ) Interest rate contracts 0.4 (0.1 ) (0.5 ) (1.2 ) (0.6 ) (0.5 ) Total $ 2.0 $ 13.2 $ (24.9 ) $ (0.3 ) $ (6.5 ) $ (11.6 )
Schedule of derivative instruments, gain (loss) in income statement	The following table provides the effect derivative instruments not designated as hedging instruments had on net income ($ in millions): Derivatives Not Designated as Cash Flow Hedging Instruments Amount of Gain / (Loss) Recognized in Other Income / Expense 2017 2016 2015 Interest rate contracts $ — $ — $ — Foreign exchange contracts 2.7 1.0 (1.5 ) Total $ 2.7 $ 1.0 $ (1.5 )

Accrued Expenses (Tables)

Accrued Expenses (Tables)	12 Months Ended
	Dec. 31, 2017
Accrued Expenses [Abstract]
Schedule of Accrued Liabilities	Accrued expenses consisted of the following ($ in millions): December 31, 2017 2016 Accrued salaries, wages and employee benefits $ 46.9 $ 39.2 Other accrued expenses 31.7 38.0 Total $ 78.6 $ 77.2

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Schedule of Income Before Income Taxes	For financial reporting purposes, income before income taxes includes the following components ($ in millions): For the Years Ended December 31, 2017 2016 2015 United States $ 42.6 $ 27.7 $ 41.6 Foreign 58.9 65.7 63.9 Total $ 101.5 $ 93.4 $ 105.5
Schedule of Components of Income Tax Expense (Benefit), Continuing Operations	An analysis of the provision (benefit) for income taxes from continuing operations follows ($ in millions): For the Years Ended December 31, 2017 2016 2015 Current income taxes: U.S. federal $ 53.2 $ 14.3 $ 13.0 U.S. state 0.6 0.1 1.1 Foreign 14.2 17.2 14.2 68.0 31.6 28.3 Deferred income taxes: U.S. federal (1.3 ) (2.7 ) (5.8 ) U.S. state 2.9 (4.0 ) 0.1 Foreign — (9.5 ) (1.0 ) 1.6 (16.2 ) (6.7 ) Total $ 69.6 $ 15.4 $ 21.6
Schedule of Reconciliation of Income Tax Rate	A reconciliation of income taxes computed at the U.S. Federal statutory income tax rate to the provision for income taxes is as follows ($ in millions): For the Years Ended December 31, 2017 2016 2015 Amount Percent Amount Percent Amount Percent Tax provision at U.S. statutory rate $ 35.6 35.0 % $ 32.6 35.0 % $ 36.9 35.0 % Foreign income tax rate differential 0.7 0.7 (9.0 ) (9.6 ) (16.2 ) (15.4 ) State income tax, net of federal benefit 2.7 2.6 (2.5 ) (2.7 ) 1.1 1.1 Domestic production deduction (2.4 ) (2.3 ) (0.9 ) (1.0 ) (1.5 ) (1.4 ) Remeasurement of deferred taxes for tax law change (11.8 ) (11.7 ) (7.0 ) (7.5 ) — — Adjustments to valuation allowances (2.8 ) (2.8 ) 3.5 3.7 1.4 1.3 U.S. tax reform transition tax 51.4 50.6 — — — — Other, net (3.8 ) (3.5 ) (1.3 ) (1.4 ) (0.1 ) (0.1 ) Provision for income taxes $ 69.6 68.6 % $ 15.4 16.5 % $ 21.6 20.5 %
Schedule of Deferred Tax Assets (Liabilities)	Net deferred income tax assets (liabilities) were comprised of the following ($ in millions): December 31, 2017 2016 Deferred Tax Assets Receivable allowances $ 0.4 $ 0.2 Reserves and accruals 3.8 3.9 Inventory and other assets 0.7 2.3 Postretirement and other employee benefits 15.9 20.0 Net operating loss and tax credit carryforwards 94.1 104.8 Intangibles 73.6 76.6 Other 4.7 0.1 193.2 207.9 Less: Valuation allowance (182.5 ) (194.8 ) Net deferred income tax assets $ 10.7 $ 13.1 Deferred Tax Liabilities Net fixed assets $ (40.5 ) $ (34.4 ) Investment in subsidiaries (9.8 ) (4.1 ) Derivatives (1.3 ) — Other (0.4 ) (0.7 ) Net deferred income tax liabilities $ (52.0 ) $ (39.2 ) Total net deferred income tax liabilities $ (41.3 ) $ (26.1 )
Summary of Operating Loss Carryforwards	As of December 31, 2017 the Company had approximately $92.8 million of tax affected operating loss carryforwards available to reduce future taxable income in various jurisdictions which will expire on various dates as follows: 2017 2018-2022 $ 3.4 2023-2034 12.7 Indefinite 76.7 92.8
Schedule of Unrecognized Tax Benefits	The following table summarizes the activity related to the Company's unrecognized tax benefits related to income taxes ($ in millions): December 31, 2017 2016 2015 Uncertain tax position balance at beginning of year $ 2.4 $ 0.9 $ 1.8 Increases related to current year tax positions 0.3 2.0 — Increases related to prior year tax positions 0.4 — — Decreases related to prior year tax positions (2.0 ) — — Decreases related to expiration of statute of limitations (0.1 ) (0.5 ) (0.9 ) Uncertain tax position balance at end of year $ 1.0 $ 2.4 $ 0.9

Postretirement and Other Bene48

Postretirement and Other Benefits (Tables)	12 Months Ended
	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Schedule of Net Funded Status	The funded status of these plans as of December 31, 2017 and 2016 was as follows ($ in millions): Pension Benefits OPEB Benefits United States France United States 2017 2016 2017 2016 2017 2016 Change in Projected Benefit Obligation, or PBO: PBO at beginning of year $ 123.2 $ 123.4 $ 32.4 $ 32.2 $ 1.4 $ 1.7 Service cost — — 1.1 1.0 — — Interest cost 4.8 5.2 0.4 0.4 0.1 0.1 Actuarial (gain) loss 3.9 2.4 (2.6 ) 2.1 0.2 — Participant contributions — — — — 0.1 0.1 Gross benefits paid (7.8 ) (7.8 ) (5.7 ) (3.0 ) (0.4 ) (0.5 ) Currency translation effect — — 4.9 (0.3 ) — — PBO at end of year $ 124.1 $ 123.2 $ 30.5 $ 32.4 $ 1.4 $ 1.4 Change in Plan Assets: Fair value of plan assets at beginning of year 118.9 116.7 6.1 8.4 — — Actual return on plan assets 17.6 10.0 0.2 0.1 — — Employer contributions — — 1.9 0.7 0.3 0.4 Participant contributions — — — — 0.1 0.1 Gross benefits paid (7.8 ) (7.8 ) (5.6 ) (2.9 ) (0.4 ) (0.5 ) Currency translation effect — — 0.6 (0.2 ) — — Fair value of plan assets at end of year $ 128.7 $ 118.9 $ 3.2 $ 6.1 $ — $ — Funded status at end of year $ 4.6 $ (4.3 ) $ (27.3 ) $ (26.3 ) $ (1.4 ) $ (1.4 )
Schedule of Accumulated Benefit Obligations and PBO excess of Fair Value of Pension Plan Assets	The PBO, ABO and fair value of pension plan assets for the Company's U.S. and French defined benefit pension plans as of December 31, 2017 and 2016 as follows ($ in millions): United States France 2017 2016 2017 2016 PBO $ 124.1 $ 123.2 $ 30.5 $ 32.4 ABO 124.1 123.2 25.6 28.2 Fair value of plan assets 128.7 118.9 3.2 6.1
Schedule of Defined Benefit Plan Amounts Recognized in Accumulated Other Comprehensive Income	As of December 31, 2017 , the pre-tax amounts in accumulated other comprehensive income that have not been recognized as components of net periodic benefit cost for the U.S. and French pension plans and other postretirement benefit plans in the United States are as follows ($ in millions): Pension Benefits OPEB Benefits United States France United States Accumulated loss $ 27.1 $ 12.5 $ 0.6 Prior service credit — (3.4 ) (0.2 ) Accumulated other comprehensive loss $ 27.1 $ 9.1 $ 0.4
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year	The amounts in accumulated other comprehensive loss at December 31, 2017 , which are expected to be recognized as components of U.S. and French net periodic benefit cost in 2018 are as follows ($ in millions): Pension Benefits OPEB Benefits United States France United States Amortization of accumulated loss $ (3.5 ) $ (1.1 ) $ (0.3 ) Amortization of prior service credit — 0.3 0.1 Total $ (3.5 ) $ (0.8 ) $ (0.2 )
Schedule of Net Benefit Costs	The components of net pension and OPEB benefit costs for U.S. employees and net pension benefit costs for French employees during the years ended December 31, 2017 , 2016 and 2015 were as follows ($ in millions): U.S. Pension Benefits French Pension Benefits U.S. OPEB Benefits 2017 2016 2015 2017 2016 2015 2017 2016 2015 Service cost $ — $ — $ — $ 1.1 $ 1.0 $ 1.3 $ — $ — $ — Interest cost 4.8 5.2 5.0 0.4 0.4 0.4 0.1 0.1 0.1 Expected return on plan assets (6.4 ) (6.8 ) (7.0 ) (0.2 ) (0.2 ) (0.3 ) — — — Amortizations and other 3.2 3.8 5.1 1.4 1.1 0.2 0.2 0.2 (0.2 ) Net periodic benefit cost $ 1.6 $ 2.2 $ 3.1 $ 2.7 $ 2.3 $ 1.6 $ 0.3 $ 0.3 $ (0.1 )
Schedule of Allocation of Plan Assets	The following table sets forth by level, within the fair value hierarchy, the U.S. and French pension plans' assets at fair value as of December 31, 2017 ($ in millions): United States France Plan Asset Category Total Other* Level 1 Level 2 Level 3 Total Level 1 Level 2 Cash equivalents $ 1.1 $ — $ 1.1 $ — $ — $ 1.2 $ 1.2 $ — Equity securities Domestic large cap 9.0 9.0 — — — 1.0 1.0 — Domestic small cap 5.8 5.8 — — — — — — International 25.3 25.3 — — — — — — Fixed income securities 87.4 31.1 — 56.3 — 0.9 — 0.9 Alternative investments** 0.1 — — — 0.1 0.1 — 0.1 Total $ 128.7 $ 71.2 $ 1.1 $ 56.3 $ 0.1 $ 3.2 $ 2.2 $ 1.0 The following table sets forth by level, within the fair value hierarchy, the U.S. and French pension plans' assets at fair value as of December 31, 2016 ($ in millions): United States France Plan Asset Category Total Other* Level 1 Level 2 Level 3 Total Level 1 Level 2 Cash equivalents $ 1.2 $ — $ 1.2 $ — $ — $ 1.5 $ 1.5 $ — Equity securities Domestic large cap 8.3 8.3 — — — 1.2 1.2 — Domestic small cap 5.7 5.7 — — — — — — International 23.7 23.7 — — — — — — Fixed income securities 79.9 79.9 — — — 3.2 — 3.2 Alternative investments** 0.1 — — — 0.1 0.2 — 0.2 Total $ 118.9 $ 117.6 $ 1.2 $ — $ 0.1 $ 6.1 $ 2.7 $ 3.4 * Assets are measured at NAV as a practical expedient and not subject to hierarchy level classification disclosure. The U.S. and French pension plans' asset target allocations by asset category for 2018 and actual allocations by asset category at December 31, 2017 and 2016 were as follows: United States France 2018 Target 2017 2016 2017 2016 Asset Category Cash and cash equivalents 1 % 1 % 1 % 38 % 24 % Equity securities* Domestic large cap 7 7 7 31 20 Domestic small cap 4 4 5 — — International 20 20 20 — — Fixed income securities 68 68 67 28 54 Alternative investments** — — — 3 2 Total 100 % 100 % 100 % 100 % 100 % * None of the Company's pension plan assets are targeted for investment in SWM stock, except that it is possible that one or more mutual funds held by the plan could hold shares of SWM. ** Investments in this category under the U.S. pension plan only may include hedge funds, and may include real estate under the French pension plan.
Schedule of Changes in Plan Assets	The following table shows the changes in Level 3 asset values ($ in millions): U.S. Level 3 Asset Reconciliation Alternative Investments Total Beginning balance, January 1, 2016 $ 0.3 Realized and unrealized gains — Purchases — Sales (0.2 ) Ending balance, December 31, 2016 $ 0.1 Realized and unrealized gains — Purchases — Sales — Ending balance, December 31, 2017 $ 0.1
Schedule of Expected Benefit Payments	The Company expects the following estimated undiscounted future pension benefit payments for the United States and France and future postretirement healthcare and life insurance benefit payments for the United States, which are to be made from pension plan and employer assets, net of amounts that will be funded from retiree contributions, and which reflect expected future service, as appropriate ($ in millions): United States France Pension Benefits Healthcare and Life Insurance Benefits Pension Benefits 2018 $ 8.5 $ 0.2 $ 1.4 2019 8.4 0.1 2.1 2020 8.3 0.1 0.7 2021 8.3 0.1 1.3 2022 8.2 0.1 0.9 2023 - 2027 39.1 0.3 7.7
Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Assumptions Used	The weighted average assumptions used to determine benefit obligations as of December 31, 2017 and 2016 were as follows: Pension Benefits OPEB Benefits United States France United States 2017 2016 2017 2016 2017 2016 Discount rate 3.60 % 4.11 % 1.14 % 1.12 % 3.59 % 4.09 % Rate of compensation increase — % — % 1.75 % 1.90 % 3.50 % 3.50 %
Net Periodic Benfit Cost [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Assumptions Used	The weighted average assumptions used to determine net periodic benefit costs for the years ended December 31, 2017 , 2016 and 2015 were as follows: Pension Benefits OPEB Benefits United States France United States 2017 2016 2015 2017 2016 2015 2017 2016 2015 Discount rate 4.11 % 4.40 % 3.94 % 1.14 % 1.12 % 1.43 % 4.09 % 4.29 % 3.82 % Expected long-term rate of return on plan assets 5.56 % 5.83 % 6.06 % 3.00 % 3.00 % 3.00 % — % — % — % Rate of compensation increase — % — % — % 1.75 % 1.90 % 1.90 % 3.50 % 3.50 % 3.50 %

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2017
Stockholders' Equity Note [Abstract]
Schedule of Share-based Compensation, Restricted Stock Activity	The following table presents restricted stock activity for the years 2017 , 2016 and 2015 : 2017 2016 2015 # of Shares Weighted Average Fair Value at Date of Grant # of Shares Weighted Average Fair Value at Date of Grant # of Shares Weighted Average Fair Value at Date of Grant Nonvested restricted shares outstanding at January 1 224,289 $ 41.30 197,674 $ 43.56 366,363 $ 38.24 Granted 216,017 36.03 150,647 39.47 107,346 45.34 Forfeited (29,150 ) 42.50 (51,234 ) 43.56 (39,322 ) 40.93 Vested (127,818 ) 41.06 (72,798 ) 42.06 (236,713 ) 36.57 Nonvested restricted shares outstanding at December 31 283,338 $ 37.26 224,289 $ 41.30 197,674 $ 43.56
Reconciliation of the Common and Potential Common Shares Outstanding Used in Earnings Per Share Calculation	A reconciliation of the average number of common and potential common shares outstanding used in the calculations of basic and diluted net income per share follows ($ in millions, shares in thousands): For the Years Ended December 31, 2017 2016 2015 Numerator (basic and diluted): Net income $ 34.5 $ 82.8 $ 89.7 Less: Dividends paid to participating securities (0.4 ) (0.3 ) (0.2 ) Less: Undistributed earnings available to participating securities — (0.2 ) (0.3 ) Undistributed and distributed earnings available to common stockholders $ 34.1 $ 82.3 $ 89.2 Denominator: Average number of common shares outstanding 30,407.1 30,310.9 30,251.4 Effect of dilutive stock-based compensation 142.2 152.5 122.9 Average number of common and potential common shares outstanding 30,549.3 30,463.4 30,374.3

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Future minimum rental payments for operating leases	Future minimum obligations under non-cancelable operating leases having an initial or remaining term in excess of one year as of December 31, 2017 are as follows ($ in millions): 2018 $ 6.2 2019 5.2 2020 4.8 2021 4.2 2022 3.7 Thereafter 9.7 Total $ 33.8

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segments	($ in millions) Net Sales For the Years Ended December 31, 2017 2016 2015 Advanced Materials & Structures $ 433.2 44.1 % $ 280.6 33.4 % $ 180.2 23.6 % Engineered Papers 548.9 55.9 559.3 66.6 583.9 76.4 Consolidated $ 982.1 100.0 % $ 839.9 100.0 % $ 764.1 100.0 % ($ in millions) Operating Profit For the Years Ended December 31, 2017 2016 2015 Advanced Materials & Structures $ 48.5 38.9 % $ 9.0 8.5 % $ 16.7 16.2 % Engineered Papers 116.1 93.1 138.0 130.0 121.5 118.0 Unallocated (39.9 ) (32.0 ) (40.9 ) (38.5 ) (35.2 ) (34.2 ) Consolidated $ 124.7 100.0 % $ 106.1 100.0 % $ 103.0 100.0 % ($ in millions) Segment Assets December 31, 2017 December 31, 2016 December 31, 2015 Advanced Materials & Structures $ 811.7 $ 569.3 $ 648.4 Engineered Papers 537.6 505.1 507.3 Unallocated 193.2 99.3 134.3 Consolidated $ 1,542.5 $ 1,173.7 $ 1,290.0 ($ in millions) Capital Spending Depreciation 2017 2016 2015 2017 2016 2015 Advanced Materials & Structures $ 11.5 $ 10.1 $ 11.2 $ 12.3 $ 7.1 $ 5.5 Engineered Papers 25.6 17.6 12.5 23.4 22.3 25.6 Unallocated 0.1 0.1 0.5 — — (0.4 ) Consolidated $ 37.2 $ 27.8 $ 24.2 $ 35.7 $ 29.4 $ 30.7
Net Sales Attributed to Geographic Locations Based on the Location of the Company's Direct Customers	Long-lived assets by geographic area as of year-end were as follows ($ in millions): Long-Lived Assets 2017 2016 2015 United States $ 115.0 $ 89.6 $ 87.5 France 181.3 162.7 163.5 Brazil 24.2 23.7 20.1 Poland 21.9 20.0 23.6 Other foreign countries 26.9 15.8 15.9 Consolidated $ 369.3 $ 311.8 $ 310.6 For the geographic disclosure in the following table, net sales are attributed to geographic locations based on the location of the Company's direct customers ($ in millions): Net Sales 2017 2016 2015 United States $ 468.9 $ 372.2 $ 310.7 Europe and the former Commonwealth of Independent States 259.9 253.2 261.2 Asia-Pacific (including China) 148.4 129.4 118.5 Latin America 57.9 47.4 34.6 Other foreign countries 47.0 37.7 39.1 Consolidated $ 982.1 $ 839.9 $ 764.1

Supplemental Disclosures (Table

Supplemental Disclosures (Tables)	12 Months Ended
	Dec. 31, 2017
SUPPLEMENTAL DISCLOSURES [Abstract]
Allowance for Doubtful Accounts	Analysis of Allowances for Doubtful Accounts: ($ in millions) For the Years Ended December 31, 2017 2016 2015 Allowance for Doubtful Accounts Beginning balance $ 0.8 $ 0.4 $ 0.3 Bad debt expense 0.8 0.4 0.2 Write-offs and discounts (0.6 ) — (0.1 ) Currency translation — — — Ending balance $ 1.0 $ 0.8 $ 0.4
Schedule of Cash Flow, Supplemental Disclosures	Supplemental Cash Flow Information ($ in millions) For the Years Ended December 31, 2017 2016 2015 Interest paid $ 22.7 $ 13.3 $ 7.8 Income taxes paid 38.1 31.9 9.3 Capital spending in accounts payable and accrued liabilities 7.7 8.8 2.6 Deferred contingent business acquisition consideration 8.6 — —

Quarterly Financial Informati53

Quarterly Financial Information (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information	The following tables summarize the Company's unaudited quarterly financial data for the years ended December 31, 2017 and 2016 ($ in millions, except per share amounts): 2017 First Quarter Second Quarter Third Quarter Fourth Quarter Year Net sales $ 233.3 $ 255.3 $ 257.8 $ 235.7 $ 982.1 Gross profit 63.1 76.6 75.8 66.8 282.3 Restructuring and impairment expense 1.1 1.6 1.5 3.9 8.1 Operating profit 26.6 39.5 38.5 20.1 124.7 Income (loss) from continuing operations 13.7 22.3 25.7 (27.3 ) 34.4 Income from discontinued operations — — 0.1 — 0.1 Net (loss) income $ 13.7 $ 22.3 $ 25.8 $ (27.3 ) $ 34.5 Net income (loss) per share: Income (loss) per share from continuing operations - basic $ 0.45 $ 0.73 $ 0.84 $ (0.90 ) $ 1.12 Income per share from discontinued operations - basic — — — — — Net income (loss) per share - basic $ 0.45 $ 0.73 $ 0.84 $ (0.90 ) $ 1.12 Income (loss) per share from continuing operations - diluted $ 0.45 $ 0.72 $ 0.84 $ (0.89 ) $ 1.12 Income per share from discontinued operations - diluted — — — — — Net income (loss) per share - diluted $ 0.45 $ 0.72 $ 0.84 $ (0.89 ) $ 1.12 2016 First Quarter Second Quarter Third Quarter Fourth Quarter Year Net sales $ 214.6 $ 217.3 $ 209.3 $ 198.7 $ 839.9 Gross profit 63.5 66.9 63.1 63.2 256.7 Restructuring and impairment expense 1.8 0.9 1.3 21.6 25.6 Operating profit 31.6 37.5 30.8 6.2 106.1 Income from continuing operations 21.1 26.0 18.7 17.0 82.8 (Loss) income from discontinued operations — — — — — Net income $ 21.1 $ 26.0 $ 18.7 $ 17.0 $ 82.8 Net income per share: Income per share from continuing operations - basic $ 0.69 $ 0.85 $ 0.62 $ 0.55 $ 2.71 (Loss) income per share from discontinued operations - basic — — — — — Net income per share - basic $ 0.69 $ 0.85 $ 0.62 $ 0.55 $ 2.71 Income per share from continuing operations - diluted $ 0.69 $ 0.85 $ 0.61 $ 0.55 $ 2.70 (Loss) income per share from discontinued operations - diluted — — — — — Net income per share - diluted $ 0.69 $ 0.85 $ 0.61 $ 0.55 $ 2.70

General (Details)

General (Details)	12 Months Ended
	Dec. 31, 2017countryjoint_venturesegmentproduction_locations
Nature of Business [Line Items]
Number of operating segments | segment	2
Number of countries in which entity operates | country	90
Number of production locations | production_locations	23
China [Member]
Nature of Business [Line Items]
Number of joint ventures | joint_venture	2
Ownership of joint ventures (as a percent)	50.00%

Summary of Significant Accoun55

Summary of Significant Accounting Policies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)joint_venture	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Significant Accounting Policies [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax	$ (3.5)	$ (0.2)	$ 0.8
Royalty Income [Abstract]
Royalty income	3.9	8.3	9.6
Business Combinations [Abstract]
Acquisition Costs	$ 0.2	1.8	2.6
Capitalized Computer Software [Abstract]
Software useful life	7 years
Amortization of capitalized software	$ 1.1	1	$ 2
Accumulated amortization of capitalized software costs	$ 35.4	$ 31.5
Restricted Stock [Member] | Minimum [Member]
Restricted Stock Plan Performance Based Shares [Abstract]
Share based compensation vesting period (years)	2 years
Restricted Stock [Member] | Maximum [Member]
Restricted Stock Plan Performance Based Shares [Abstract]
Share based compensation vesting period (years)	4 years
Restricted Stock Performance Plan [Member] | Minimum [Member]
Restricted Stock Plan Performance Based Shares [Abstract]
Plan performance period (years)	1 year
China [Member]
Principles of Consolidation [Abstract]
Number of joint ventures | joint_venture	2
Ownership of joint ventures (as a percent)	50.00%
Accounting Standards Update 2016-16
Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	$ 2.2

Summary of Significant Accoun56

Summary of Significant Accounting Policies - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $13.8 million and $17.6 million at December 31, 2017 and 2016, respectively	$ (24.9)	$ (36.5)
Accumulated unrealized loss on derivative instruments, net of income tax benefit of $0.2 million and $3.0 million at December 31, 2017 and 2016, respectively	0.4	(1.9)
Accumulated unrealized foreign currency translation adjustments, net of income tax benefit of $4.5 million and $0.0 million at December 31, 2017 and 2016, respectively	(64.9)	(100.9)
Accumulated other comprehensive loss	(89.4)	(139.3)
Accumulated pension and OPEB tax	13.8	17.6
Accumulated tax on gain (loss) on financial instruments	0.2	3
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	$ 4.5	$ 0

Summary of Significant Accoun57

Summary of Significant Accounting Policies - Changes in the Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Pension and OPEB liability adjustments, pre-tax	$ 15.4	$ 3.4	$ 1.9
Unrealized gain (loss) on financial instruments, pre-tax	5.1	23	(13.6)
Unrealized foreign currency translation adjustments, pre-tax	31.5	(16.7)	(54.4)
Total other comprehensive income (loss), pre-tax	52	9.7	(66.1)
Pension and OPEB liability adjustments, Tax	(3.8)	(4.3)	0.9
Unrealized gain (loss) on financial instruments, Tax	(2.8)	(3.3)	0.3
Unrealized foreign currency translation adjustments, Tax	4.5	0	0
Total other comprehensive income (loss), Tax	(2.1)	(7.6)	1.2
Pension and OPEB liability adjustments, Net of Tax	11.6	(0.9)	2.8
Unrealized gain (loss) on financial instruments, Net of Tax	2.3	19.7	(13.3)
Unrealized foreign currency translation adjustments, Net of Tax	36	(16.7)	(54.4)
Other comprehensive income (loss)	$ 49.9	$ 2.1	$ (64.9)

Business Acquisitions - Schedul

Business Acquisitions - Schedule of Recognized Identifiable Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Jan. 20, 2017	Oct. 28, 2015	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill			$ 341.3	$ 341.3	$ 229.5	$ 233.3
Argotec [Member]
Business Acquisition [Line Items]
Purchase price of acquisition		$ 282.7
Cash and cash equivalents		2.7
Accounts receivable		16.1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory		16.3
Other current assets		0.1
Property, plant and equipment		15.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Assets		0.9
Identifiable intangible assets		130.5
Total assets		182.5
Accounts payable		4.6
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other		4.5
Net assets acquired		173.4
Goodwill		109.3
Total consideration		282.7
Fair value of receivables acquired		16.1
Gross contractual amounts receivable		16.8
Real Estate Held-for-sale		$ 1
Financing costs related to the acquisition						7.4
Conwed Plastics LLC [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Liabilities Incurred	$ 8.6		9.5
Purchase price of acquisition	295
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	40
Cash and cash equivalents	3.3
Accounts receivable	15.4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory	20.6
Other current assets	1.1
Property, plant and equipment	31.7
Identifiable intangible assets	134.4
Total assets	206.5
Accounts payable	8.2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent	0.9
Net assets acquired	197.4
Goodwill	106.2
Total consideration	303.6
Fair value of receivables acquired	15.4
Gross contractual amounts receivable	15.8
Financing costs related to the acquisition				0.6
Business Combination, Consideration Transferred	303.6
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability			$ 0.9
Fair Value Adjustment to Inventory [Member] | Conwed Plastics LLC [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory	$ 2.9
Acquisition-related Costs [Member] | Argotec [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs					0.4	$ 1.8
Acquisition-related Costs [Member] | Conwed Plastics LLC [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs				$ 0.2	$ 1.4

Business Acquisitions - Finite-

Business Acquisitions - Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination (Details) - USD ($) $ in Millions	Jan. 20, 2017	Oct. 28, 2015
Conwed Plastics LLC [Member]
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Fair Value	$ 134.4
Conwed Plastics LLC [Member] | Trade names [Member]
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Fair Value	7.1
Conwed Plastics LLC [Member] | Customer relationships [Member]
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Fair Value	$ 108
Weighted-Average Amortization Period (Years)	15 years
Conwed Plastics LLC [Member] | Non-competition agreements [Member]
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Fair Value	$ 1.2
Weighted-Average Amortization Period (Years)	7 years 2 months 12 days
Conwed Plastics LLC [Member] | Developed Technology [Member]
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Fair Value	$ 18.1
Weighted-Average Amortization Period (Years)	17 years 2 months 12 days
Conwed Plastics LLC [Member] | Finite-Lived Intangible Assets [Member]
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Fair Value	$ 127.3
Argotec [Member]
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Fair Value		$ 130.5
Argotec [Member] | Trade names [Member]
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Fair Value		12.9
Argotec [Member] | Customer relationships [Member]
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Fair Value		$ 115.9
Weighted-Average Amortization Period (Years)		15 years
Argotec [Member] | Non-competition agreements [Member]
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Fair Value		$ 1.7
Weighted-Average Amortization Period (Years)		4 years

Business Acquisitions Business

Business Acquisitions Business Acquisitions - Actual and Pro Forma Net Sales and Income from Continuing Operations (Details) - USD ($) $ in Millions	2 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Conwed Plastics LLC [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net Sales, Actual		$ 141.3
Net Sales, Pro Forma			$ 989.8	$ 984.1
(Loss) Income from Continuing Operations, Actual		$ 11.9
(Loss) Income from Continuing Operations, Pro Forma			$ 31.1	$ 90.6
Argotec [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net Sales, Actual	$ 22.3
Net Sales, Pro Forma					$ 859.7
(Loss) Income from Continuing Operations, Actual	$ 0.9
(Loss) Income from Continuing Operations, Pro Forma					$ 90.2

Discontinued Operations (Detail

Discontinued Operations (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
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue									$ 0	$ 0	$ 0
Restructuring Charges									3.5	4.3
Disposal Group, Including Discontinued Operation, Other Income									0.1
Liabilities of discontinued operations:
Other income (expense)										0	(0.7)
Loss from discontinued operations before income taxes									0.1	0	(0.7)
Income tax (provision) benefit									0	0	(0.1)
Loss from discontinued operations	$ 0	$ 0.1	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	0.1	0	$ (0.8)
Discontinued Operations, Disposed of by Sale [Member]
Assets of discontinued operations:
Assets held for sale	1				1				1	1
Other assets	2.4				2.5				2.4	2.5
Liabilities of discontinued operations:
Current liabilities	$ 0.1				$ 0.1				$ 0.1	$ 0.1

Accounts Receivable (Details)

Accounts Receivable (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Accounts Receivable [Line Items]
Less allowance for doubtful accounts and sales discounts	$ (1)	$ (0.8)
Total accounts receivable	149.4	115.1
Trade receivables [Member]
Accounts Receivable [Line Items]
Accounts receivable, gross	120.2	98.2
Business tax credits, including VAT [Member]
Accounts Receivable [Line Items]
Accounts receivable, gross	4.3	3.1
Hedge contracts receivable [Member]
Accounts Receivable [Line Items]
Accounts receivable, gross	4.8	1
Other receivables [Member]
Accounts Receivable [Line Items]
Accounts receivable, gross	$ 21.1	$ 13.6

Inventories (Details)

Inventories (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 50.4	$ 40.9
Work in process	21.3	23.9
Finished goods	74.2	44.9
Supplies and other	9.3	9.7
Total	$ 155.2	$ 119.4

Property, Plant and Equipment64

Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 810.4	$ 684.1
Less: Accumulated depreciation	448.5	376.7
Property, plant and equipment, net	361.9	307.4
Depreciation expense	35.7	29.4	$ 30.7
Land and improvements [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	15.3	11.2
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	145.1	118.5
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	621.9	526.1
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 28.1	$ 28.3
Minimum [Member] | Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	20 years
Minimum [Member] | Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Maximum [Member] | Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	40 years
Maximum [Member] | Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	20 years
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | RTL facility [Member]
Property, Plant and Equipment [Line Items]
Assets held for sale	$ 12.8

Joint Ventures (Details)

Joint Ventures (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)joint_venture	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Summarized Financial Information, Revenue	$ 105	$ 107.5	$ 122
Equity Method Investment, Summarized Financial Information, Current Assets	112.4	118.6
Equity Method Investments	68.5	63.8
Equity Method Investment, Summarized Financial Information, Noncurrent Assets	205.3	201.7
Equity Method Investment, Summarized Financial Information, Current Liabilities	64.8	69.6
Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities	114.7	122
Equity Method Investment Summarized Financial Information, Equity	138.2	128.7
Equity Method Investment, Summarized Financial Information, Gross Profit (Loss)	28.8	36.5	42.7
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	$ 4.9	9.5	13.2
China [Member]
Schedule of Equity Method Investments [Line Items]
Number of Joint Ventures | joint_venture	2
Equity Method Investment, Ownership Percentage	50.00%
Management Fees Revenue	$ 2.1	$ 2	$ 2.9

Goodwill - Carrying Amount of G

Goodwill - Carrying Amount of Goodwill By Segment (Details)	12 Months Ended
	Dec. 31, 2017USD ($)reportable_unit	Dec. 31, 2016USD ($)
Goodwill [Line Items]
Number of reportable units with goodwill | reportable_unit	2
Goodwill [Roll Forward]
Goodwill beginning of period, net	$ 229,500,000	$ 233,300,000
Goodwill acquired during the year	106,200,000
Goodwill, Purchase Accounting Adjustments		(200,000)
Foreign currency translation adjustments	5,600,000	(3,600,000)
Goodwill end of period, net	341,300,000	229,500,000
Engineered Papers [Member]
Goodwill [Line Items]
Accumulated impairment losses	2,700,000
Goodwill [Roll Forward]
Goodwill beginning of period, net	4,700,000	4,800,000
Goodwill acquired during the year	0
Goodwill, Purchase Accounting Adjustments		0
Foreign currency translation adjustments	500,000	(100,000)
Goodwill end of period, net	5,200,000	4,700,000
Advanced Materials & Structures [Member]
Goodwill [Line Items]
Accumulated impairment losses	0
Goodwill [Roll Forward]
Goodwill beginning of period, net	224,800,000	228,500,000
Goodwill acquired during the year	106,200,000
Goodwill, Purchase Accounting Adjustments		(200,000)
Foreign currency translation adjustments	5,100,000	(3,500,000)
Goodwill end of period, net	$ 336,100,000	$ 224,800,000

Other Assets (Details)

Other Assets (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Other Assets [Abstract]
Capitalized software costs, net of accumulated amortization	$ 7.4	$ 4.4
Business tax credits, including VAT and ICMS (net of $10.6 million and $11.5 million reserve as of December 31, 2017 and 2016, respectively)	2.4	2.5
Grantor trust assets	12.2	10.3
Other assets	5.9	4.3
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	4.6	0
Inventory, Noncurrent	7	6
Additional Information
Reserve for losses on business tax credits	10.6	11.5
Total	$ 39.5	$ 27.5

Intangible Assets (Details)

Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 337.4	$ 220.1
Accumulated Amortization	42	31.1
Accumulated Impairments	20.7	20.7
Accumulated Foreign Exchange	(2.1)	3.8
Net Carrying Amount	276.8	164.5
Amortization expense of intangible assets	20.9	12.3	$ 5.6
Estimated Amortization Expense
2,018	20.7
2,019	20.6
2,020	20.3
2,021	20.3
2,022	20.2
Trade names [Member] | Advanced Materials & Structures [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated Impairments	0	0
Accumulated Foreign Exchange	(0.4)	(0.1)
Indefinite-Lived Intangible Assets (Excluding Goodwill), Gross	20	12.9
Estimated Amortization Expense
Indefinite-Lived Intangible Assets (Excluding Goodwill)	20.4	13
Customer-related intangibles [Member] | Engineered Papers [Member]
Finite-Lived Intangible Assets [Line Items]
Net Carrying Amount		0
Customer Relationships [Member] | Engineered Papers [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		10
Accumulated Amortization		10
Accumulated Impairments		0
Accumulated Foreign Exchange		0
Customer Relationships [Member] | Advanced Materials & Structures [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	276.3	168.3
Accumulated Amortization	32.9	15.9
Accumulated Impairments	0	0
Accumulated Foreign Exchange	(2.3)	3.1
Net Carrying Amount	245.7	149.3
Developed Technology [Member] | Advanced Materials & Structures [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	34	15.9
Accumulated Amortization	6	3.6
Accumulated Impairments	0	0
Accumulated Foreign Exchange	(0.1)	0.4
Net Carrying Amount	28.1	11.9
Customer Contracts [Member] | Advanced Materials & Structures [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	0.9	0.9
Accumulated Amortization	0.9	0.9
Accumulated Impairments	0	0
Accumulated Foreign Exchange	0	0
Net Carrying Amount	0	0
Trade names [Member] | Advanced Materials & Structures [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	21.8	21.8
Accumulated Amortization	0.8	0
Accumulated Impairments	20.7	20.7
Accumulated Foreign Exchange	0.3	0.3
Net Carrying Amount	0	0.8
Amortized Intangible Assets, Impairments		20.7
Non-competition agreements [Member] | Advanced Materials & Structures [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2.9	1.7
Accumulated Amortization	1.1	0.5
Accumulated Impairments	0	0
Accumulated Foreign Exchange	0	0
Net Carrying Amount	1.8	1.2
Patents [Member] | Advanced Materials & Structures [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1.5	1.5
Accumulated Amortization	0.3	0.2
Accumulated Impairments	0	0
Accumulated Foreign Exchange	0	0
Net Carrying Amount	1.2	$ 1.3
Conwed Plastics LLC [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets	$ 8.2

Restructuring and Impairment 69

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	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
Engineered Papers [Member] | Asset Impairment Charge [Member] | Philippines [Member] | RTL facility [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment expense									4		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

Debt - Schedule of Debt Summari

Debt - Schedule of Debt Summarized (Details) - USD ($) $ in Millions	Jan. 20, 2017	Dec. 31, 2017	Dec. 31, 2016	Oct. 28, 2015
Debt Instrument [Line Items]
Total		$ 690
Short-term Debt		1.5	$ 0
Debt Issuance Costs, Net		5.8	7
Debt, Long-term and Short-term, Combined Amount		684.2	440.4
Long-term Debt, Current Maturities		(5.1)	(3)
Long-term debt		679.1	437.4
Bank Overdrafts [Member]
Debt Instrument [Line Items]
Total		4.1	0
French Employee Profit Sharing [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		9.1	9.5
Revolving Credit Agreement - U.S. dollar borrowings [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		344.5	131
Revolving Credit Agreement - euro borrowings [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		26.4	0
Term Loan A-1 [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		60	60
Term Loan A-2 [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 244.4	$ 246.9
First Amendment to Second Amended and Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Debt Issuance Costs Incurred During Noncash or Partial Noncash Transaction	$ 0.6
Second Amended and Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Debt Issuance Costs, Net				$ 7.4

Debt (Details)

Debt (Details) € in Millions	Jan. 20, 2017USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2017USD ($)	Jan. 01, 2019	Jul. 01, 2018	Apr. 01, 2018	Jan. 01, 2018	Jan. 20, 2017EUR (€)	Dec. 31, 2016USD ($)	Oct. 28, 2015USD ($)	Oct. 29, 2013USD ($)
French Employee Profit Sharing [Member]
Debt Instrument [Line Items]
Interest rate at period end			1.15%						0.80%
Bank Overdrafts [Member]
Debt Instrument [Line Items]
Interest rate at period end			0.24%						0.14%
Bank overdraft facilities			$ 20,000,000						$ 27,300,000
Second Amended and Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Maximum borrowings under credit facility										$ 1,000,000,000
EBITDA ratio	4.25							4.25
Term Loan A-1 [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount										$ 100,000,000
Debt amortization rate on A1 for first two years										5.00%
Debt amortization rate on A1 for final three years										10.00%
Prepayment of amortization for term loan		$ 40,000,000
Line of Credit Facility, Interest Rate at Period End			3.63%
Term Loan A-2 [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount										$ 250,000,000
Annual Debt Amortization Rate - A-2										1.00%
Line of Credit Facility, Interest Rate at Period End			3.88%
First Amendment to Second Amended and Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Debt Issuance Costs Incurred During Noncash or Partial Noncash Transaction	$ 600,000
Revolving Credit Facility [Member] | Second Amended and Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Maximum borrowings under credit facility										$ 650,000,000
Revolving Credit Facility [Member] | Revolving Credit Agreement - euro borrowings [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate at Period End			2.00%
Revolving Credit Facility [Member] | Revolving Credit Agreement - U.S. dollar borrowings [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate at Period End			3.60%
Base Rate [Member] | Term Loan A-1 [Member] | Term Loan [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.50%
Base Rate [Member] | Term Loan A-1 [Member] | Term Loan [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.25%
Base Rate [Member] | Term Loan A-2 [Member] | Term Loan [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.75%
Base Rate [Member] | Term Loan A-2 [Member] | Term Loan [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.50%
Base Rate [Member] | Revolving Credit Facility [Member] | Second Amended and Restated Credit Agreement [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.50%
Base Rate [Member] | Revolving Credit Facility [Member] | Second Amended and Restated Credit Agreement [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.25%
London Interbank Offered Rate (LIBOR) [Member] | Term Loan A-1 [Member] | Term Loan [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			2.50%
London Interbank Offered Rate (LIBOR) [Member] | Term Loan A-1 [Member] | Term Loan [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.25%
London Interbank Offered Rate (LIBOR) [Member] | Term Loan A-2 [Member] | Term Loan [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			2.75%
London Interbank Offered Rate (LIBOR) [Member] | Term Loan A-2 [Member] | Term Loan [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.50%
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Second Amended and Restated Credit Agreement [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			2.50%
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Second Amended and Restated Credit Agreement [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.25%
Forecast | Second Amended and Restated Credit Agreement [Member]
Debt Instrument [Line Items]
EBITDA ratio				3	3.50	3.75	4
Cross Currency Interest Rate Contract [Member]
Debt Instrument [Line Items]
Derivative, Term of Contract	3 years
Derivative, Notional Amount	$ 100,000,000							€ 93.7
Interest Rate Swap [Member] | Credit Agreement [Member]
Debt Instrument [Line Items]
Derivative, Notional Amount											$ 50,000,000
Interest Rate Swap [Member] | First Amendment to Second Amended and Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Derivative, Term of Contract	3 years
Derivative, Notional Amount	$ 315,000,000
Derivative, Fixed Interest Rate	1.65%							1.65%
Long [Member] | Cross Currency Interest Rate Contract [Member]
Debt Instrument [Line Items]
Derivative, Fixed Interest Rate	1.65%							1.65%
Short [Member] | Cross Currency Interest Rate Contract [Member]
Debt Instrument [Line Items]
Derivative, Fixed Interest Rate	0.18%							0.18%

Debt - Schedule of Long Term De

Debt - Schedule of Long Term Debt Maturities (Details) $ in Millions	Dec. 31, 2017USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]
2,018	$ 6.9
2,019	5.2
2,020	434.6
2,021	4.4
2,022	236
Thereafter	2.9
Total	$ 690

Debt - Debt Issuance Costs (Det

Debt - Debt Issuance Costs (Details) - USD ($) $ in Millions	Jan. 20, 2017	Dec. 31, 2017	Dec. 31, 2016	Oct. 28, 2015
Debt Instrument [Line Items]
Deferred debt issuance costs		$ 5.8	$ 7
Expected Future Amortization Expense [Abstract]
2,018		1.8
2,019		1.8
2,020		1.6
2,021		0.3
2,022		0.3
Total		5.8	7
First Amendment to Second Amended and Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Debt Issuance Costs Incurred During Noncash or Partial Noncash Transaction	$ 0.6
Second Amended and Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Deferred debt issuance costs				$ 7.4
Expected Future Amortization Expense [Abstract]
Total				$ 7.4
Interest Expense [Member]
Debt Instrument [Line Items]
Amortization expense		$ 1.8	$ 1.7

Derivatives - Derivatives by Ba

Derivatives - Derivatives by Balance Sheet Location (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 6.8
Liability Derivatives	14.4
Designated as hedges [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	6.7	$ 2.9
Liability Derivatives	14.4	2.2
Designated as hedges [Member] | Foreign exchange contracts [Member] | Accounts Receivable [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	4.7	1
Designated as hedges [Member] | Foreign exchange contracts [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	1.9
Designated as hedges [Member] | Foreign exchange contracts [Member] | Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	0.2	1.8
Designated as hedges [Member] | Foreign exchange contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	14.2	0
Designated as hedges [Member] | Interest rate contracts [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	2	0
Designated as hedges [Member] | Interest rate contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	0	$ 0.4
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	0.1
Liability Derivatives	0
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member] | Accounts Receivable [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	0.1
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member] | Accounts Payable [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 0

Derivatives - Derivatives by In

Derivatives - Derivatives by Income Statement Location (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized (Loss) Gain Recognized in AOCI on Derivatives, Net of Tax for the Year Ended	$ 2	$ 13.2	$ (24.9)
Loss (Gain) Reclassified from AOCI, Net of Tax	(0.3)	(6.5)	(11.6)
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	2.7	1	(1.5)
Foreign exchange contracts [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized (Loss) Gain Recognized in AOCI on Derivatives, Net of Tax for the Year Ended	1.6	13.3	(24.4)
Foreign exchange contracts [Member] | Cash Flow Hedging [Member] | Net Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss (Gain) Reclassified from AOCI, Net of Tax	0.9	(5.9)	(11.1)
Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Income/Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	2.7	1	(1.5)
Interest rate contracts [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized (Loss) Gain Recognized in AOCI on Derivatives, Net of Tax for the Year Ended	0.4	(0.1)	(0.5)
Interest rate contracts [Member] | Cash Flow Hedging [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss (Gain) Reclassified from AOCI, Net of Tax	(1.2)	(0.6)	(0.5)
Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Income/Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 0	$ 0	$ 0

Derivatives Derivative Instrume

Derivatives Derivative Instruments (Details) € in Millions, $ in Millions	Jan. 20, 2017USD ($)	Jan. 20, 2017EUR (€)
Cross Currency Interest Rate Contract [Member]
Derivative [Line Items]
Derivative, Term of Contract	3 years
Derivative, Notional Amount	$ 100	€ 93.7
Cross Currency Interest Rate Contract [Member] | Long [Member]
Derivative [Line Items]
Derivative, Fixed Interest Rate	1.65%	1.65%
Cross Currency Interest Rate Contract [Member] | Short [Member]
Derivative [Line Items]
Derivative, Fixed Interest Rate	0.18%	0.18%
First Amendment to Second Amended and Restated Credit Agreement [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Term of Contract	3 years
Derivative, Notional Amount	$ 315
Derivative, Fixed Interest Rate	1.65%	1.65%

Accrued Expenses (Details)

Accrued Expenses (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Accrued Expenses [Abstract]
Accrued salaries, wages and employee benefits	$ 46.9	$ 39.2
Other accrued expenses	31.7	38
Total	$ 78.6	$ 77.2

Income Taxes - Components of In

Income Taxes - Components of Income Before Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
United States	$ 42.6	$ 27.7	$ 41.6
Foreign	58.9	65.7	63.9
Income from continuing operations before income taxes and income from equity affiliates	$ 101.5	$ 93.4	$ 105.5

Income Taxes - Components of 79

Income Taxes - Components of Income Tax Expense (Benefit), Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current income taxes:
U.S. federal	$ 53.2	$ 14.3	$ 13
U.S. state	0.6	0.1	1.1
Foreign	14.2	17.2	14.2
Current income taxes	68	31.6	28.3
Deferred income taxes:
U.S. federal	(1.3)	(2.7)	(5.8)
U.S. state	2.9	(4)	0.1
Foreign	0	(9.5)	(1)
Deferred income taxes	1.6	(16.2)	(6.7)
Provision for income taxes	$ 69.6	$ 15.4	$ 21.6

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Income Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Amount [Abstract]
Tax provision at U.S. statutory rate	$ 35.6	$ 32.6	$ 36.9
Foreign income tax rate differential	0.7	(9)	(16.2)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	2.7	(2.5)	1.1
Domestic production deduction	(2.4)	(0.9)	(1.5)
Effective Income Tax Rate Reconciliation, Tax Settlement, Foreign, Amount	(11.8)	(7)	0
Adjustments to valuation allowances	(2.8)	3.5	1.4
Effective income tax rate reconciliation, tax cuts and jobs act of 2017, transition tax on accumulated foreign earnings, amount	51.4	0	0
Other, net	(3.8)	(1.3)	(0.1)
Provision for income taxes	$ 69.6	$ 15.4	$ 21.6
Percent [Abstract]
Tax provision at U.S. statutory rate	35.00%	35.00%	35.00%
Foreign income tax rate differential	0.70%	(9.60%)	(15.40%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	2.60%	(2.70%)	1.10%
Domestic production deduction	(2.30%)	(1.00%)	(1.40%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Foreign, Percent	(11.70%)	(7.50%)	0.00%
Adjustments to valuation allowances	(2.80%)	3.70%	1.30%
Effective income tax rate reconciliation, tax cuts and jobs act of 2017, transition tax on accumulated foreign earnings, percent	50.60%	0.00%	0.00%
Other, net	(3.50%)	(1.40%)	(0.10%)
Provision for income taxes	68.60%	16.50%	20.50%

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Assets
Receivable allowances	$ 0.4	$ 0.2
Reserves and accruals	3.8	3.9
Inventory and other assets	0.7	2.3
Postretirement and other employee benefits	15.9	20
Net operating loss and tax credit carryforwards	94.1	104.8
Deferred Tax Assets, Goodwill and Intangible Assets	73.6	76.6
Other	4.7	0.1
Deferred income tax assets	193.2	207.9
Less: Valuation allowance	(182.5)	(194.8)
Net deferred income tax assets	10.7	13.1
Deferred Tax Liabilities
Net fixed assets	(40.5)	(34.4)
Deferred Tax Liabilities, Investment in Noncontrolled Affiliates	(9.8)	(4.1)
Deferred Tax Liabilities, Derivatives	1.3	0
Other	(0.4)	(0.7)
Net deferred income tax liabilities	(52)	(39.2)
Total net deferred income tax liabilities	$ (41.3)	$ (26.1)

Income Taxes - Operating Loss C

Income Taxes - Operating Loss Carryforwards (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 92.8
Valuation allowance	182.5	$ 194.8
State Tax [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance	1
Tax Year 2017 - 2027 [Member] | State Tax [Member]
Operating Loss Carryforwards [Line Items]
Tax credits	1.3
Tax Year 2017 - 2018 [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	3.4
Indefinite
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	76.7
Tax Year 2023 - 2034 [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	12.7
LUXEMBOURG
Operating Loss Carryforwards [Line Items]
Valuation allowance	166.3
Philippines [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance	2.7
Brazil [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Valuation Allowance	3.4
Spain [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance	$ 9.1

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 1.1
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Uncertain tax position balance at beginning of year	2.4	$ 0.9	$ 1.8
Increases related to current year tax positions	0.3	2	0
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	0.4	0	0
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	(2)	0	0
Decreases related to expiration of statute of limitations	(0.1)	(0.5)	(0.9)
Uncertain tax position balance at end of year	1	$ 2.4	$ 0.9
Decrease in unrecognized tax benefits that may be recognized in next fiscal year	$ 0.2

Postretirement and Other Bene84

Postretirement and Other Benefits - Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
UNITED STATES | Pension Plan [Member]
Change in Projected Benefit Obligation, or PBO:
PBO at beginning of year	$ 123.2	$ 123.4
Service cost	0	0	$ 0
Interest cost	4.8	5.2	5
Actuarial (gain) loss	3.9	2.4
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant	0	0
Gross benefits paid	(7.8)	(7.8)
Currency translation effect	0	0
PBO at end of year	124.1	123.2	123.4
Change in Plan Assets:
Fair value of plan assets at beginning of year	118.9	116.7
Actual return on plan assets	17.6	10
Employer contributions	0	0
Participant contributions	0	0
Gross benefits paid	(7.8)	(7.8)
Currency translation effect	0	0
Fair value of plan assets at end of year	128.7	118.9	116.7
Funded status at end of year	4.6	(4.3)
UNITED STATES | Other Postretirement Benefits Plan [Member]
Change in Projected Benefit Obligation, or PBO:
PBO at beginning of year	1.4	1.7
Service cost	0	0	0
Interest cost	0.1	0.1	0.1
Actuarial (gain) loss	0.2	0
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant	0.1	0.1
Gross benefits paid	(0.4)	(0.5)
Currency translation effect	0	0
PBO at end of year	1.4	1.4	1.7
Change in Plan Assets:
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	0.3	0.4
Participant contributions	0.1	0.1
Gross benefits paid	(0.4)	(0.5)
Currency translation effect	0	0
Fair value of plan assets at end of year	0	0	0
Funded status at end of year	(1.4)	(1.4)
FRANCE | Pension Plan [Member]
Change in Projected Benefit Obligation, or PBO:
PBO at beginning of year	32.4	32.2
Service cost	1.1	1	1.3
Interest cost	0.4	0.4	0.4
Actuarial (gain) loss	(2.6)	2.1
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant	0	0
Gross benefits paid	(5.7)	(3)
Currency translation effect	4.9	(0.3)
PBO at end of year	30.5	32.4	32.2
Change in Plan Assets:
Fair value of plan assets at beginning of year	6.1	8.4
Actual return on plan assets	0.2	0.1
Employer contributions	1.9	0.7
Participant contributions	0	0
Gross benefits paid	(5.6)	(2.9)
Currency translation effect	0.6	(0.2)
Fair value of plan assets at end of year	3.2	6.1	$ 8.4
Funded status at end of year	$ (27.3)	$ (26.3)

Postretirement and Other Bene85

Postretirement and Other Benefits - PBO and ABO in Excess of Fair Value of Plan Assets (Details) - Pension Plan [Member] - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
UNITED STATES
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
PBO	$ 124.1	$ 123.2
ABO	124.1	123.2
Fair value of plan assets	128.7	118.9	$ 116.7
FRANCE
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
PBO	30.5	32.4
ABO	25.6	28.2
Fair value of plan assets	$ 3.2	$ 6.1	$ 8.4

Postretirement and Other Bene86

Postretirement and Other Benefits - Amounts Recognized in Accumulated Other Comprehensive Income (Details) $ in Millions	Dec. 31, 2017USD ($)
UNITED STATES | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated loss	$ 27.1
Prior service credit	0
Accumulated other comprehensive loss	27.1
UNITED STATES | Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated loss	0.6
Prior service credit	(0.2)
Accumulated other comprehensive loss	0.4
FRANCE | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated loss	12.5
Prior service credit	(3.4)
Accumulated other comprehensive loss	$ 9.1

Postretirement and Other Bene87

Postretirement and Other Benefits - Amortization of Accumulated Other Comprehensive Income (Details) $ in Millions	Dec. 31, 2017USD ($)
UNITED STATES | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Amortization of accumulated loss	$ (3.5)
Amortization of prior service credit	0
Total	(3.5)
UNITED STATES | Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Amortization of accumulated loss	(0.3)
Amortization of prior service credit	0.1
Total	(0.2)
FRANCE | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Amortization of accumulated loss	(1.1)
Amortization of prior service credit	0.3
Total	$ (0.8)

Postretirement and Other Bene88

Postretirement and Other Benefits - Weighted Average Assumption of Projected Benefit Obligations (Details)	Dec. 31, 2017	Dec. 31, 2016
UNITED STATES | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	3.60%	4.11%
Rate of compensation increase	0.00%	0.00%
UNITED STATES | Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	3.59%	4.09%
Rate of compensation increase	3.50%	3.50%
FRANCE | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	1.14%	1.12%
Rate of compensation increase	1.75%	1.90%

Postretirement and Other Bene89

Postretirement and Other Benefits - Net Pension Benefit Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
UNITED STATES | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 0	$ 0	$ 0
Interest cost	4.8	5.2	5
Expected return on plan assets	(6.4)	(6.8)	(7)
Amortizations and other	3.2	3.8	5.1
Net periodic benefit cost	1.6	2.2	3.1
UNITED STATES | Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0	0	0
Interest cost	0.1	0.1	0.1
Expected return on plan assets	0	0	0
Amortizations and other	0.2	0.2	(0.2)
Net periodic benefit cost	0.3	0.3	(0.1)
FRANCE | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	1.1	1	1.3
Interest cost	0.4	0.4	0.4
Expected return on plan assets	(0.2)	(0.2)	(0.3)
Amortizations and other	1.4	1.1	0.2
Net periodic benefit cost	$ 2.7	$ 2.3	$ 1.6

Postretirement and Other Bene90

Postretirement and Other Benefits - Weighted Average Assumptions - Net Periodic Benefit Cost (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
UNITED STATES | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	4.11%	4.40%	3.94%
Expected long-term rate of return on plan assets	5.56%	5.83%	6.06%
Rate of compensation increase	0.00%	0.00%	0.00%
UNITED STATES | Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	4.09%	4.29%	3.82%
Expected long-term rate of return on plan assets	0.00%	0.00%	0.00%
Rate of compensation increase	3.50%	3.50%	3.50%
FRANCE | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	1.14%	1.12%	1.43%
Expected long-term rate of return on plan assets	3.00%	3.00%	3.00%
Rate of compensation increase	1.75%	1.90%	1.90%

Postretirement and Other Bene91

Postretirement and Other Benefits - Target Allocations (Details) - Pension Plan [Member]		Dec. 31, 2017	Dec. 31, 2016
UNITED STATES
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocations 2017		100.00%
Actual allocations		100.00%	100.00%
UNITED STATES | Cash and Cash Equivalents [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocations 2017		1.00%
Actual allocations		1.00%	1.00%
UNITED STATES | Domestic Large Cap [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocations 2017	[1]	7.00%
Actual allocations	[1]	7.00%	7.00%
UNITED STATES | Domestic Small Cap [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocations 2017	[1]	4.00%
Actual allocations	[1]	4.00%	5.00%
UNITED STATES | International [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocations 2017	[1]	20.00%
Actual allocations	[1]	20.00%	20.00%
UNITED STATES | Fixed Income Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocations 2017		68.00%
Actual allocations		68.00%	67.00%
UNITED STATES | Alternative Investment [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocations 2017	[2]	0.00%
Actual allocations	[2]	0.00%	0.00%
FRANCE
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Actual allocations		100.00%	100.00%
FRANCE | Cash and Cash Equivalents [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Actual allocations		38.00%	24.00%
FRANCE | Domestic Large Cap [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Actual allocations	[1]	31.00%	20.00%
FRANCE | Domestic Small Cap [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Actual allocations	[1]	0.00%	0.00%
FRANCE | International [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Actual allocations	[1]	0.00%	0.00%
FRANCE | Fixed Income Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Actual allocations		28.00%	54.00%
FRANCE | Alternative Investment [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Actual allocations	[2]	3.00%	2.00%
[1]	None of the Company's pension plan assets are targeted for investment in SWM stock, except that it is possible that one or more mutual funds held by the plan could hold shares of SWM.
[2]	Investments in this category under the U.S. pension plan only may include hedge funds, and may include real estate under the French pension plan.

Postretirement and Other Bene92

Postretirement and Other Benefits - Fair Value of Plan Assets (Details) - Pension Plan [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
UNITED STATES
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	$ 118.9	$ 116.7
Change in Plan Assets:
Fair value of plan assets at beginning of year	118.9	116.7
Fair value of plan assets at end of year	128.7	118.9
UNITED STATES | Cash and Cash Equivalents [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	1.2	1.2
Change in Plan Assets:
Fair value of plan assets at beginning of year	1.2
Fair value of plan assets at end of year	1.1	1.2
UNITED STATES | Domestic Large Cap [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	8.3	8.3
Change in Plan Assets:
Fair value of plan assets at beginning of year	8.3
Fair value of plan assets at end of year	9	8.3
UNITED STATES | Domestic Small Cap [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	5.7	5.7
Change in Plan Assets:
Fair value of plan assets at beginning of year	5.7
Fair value of plan assets at end of year	5.8	5.7
UNITED STATES | International [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	23.7	23.7
Change in Plan Assets:
Fair value of plan assets at beginning of year	23.7
Fair value of plan assets at end of year	25.3	23.7
UNITED STATES | Fixed Income Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	79.9	79.9
Change in Plan Assets:
Fair value of plan assets at beginning of year	79.9
Fair value of plan assets at end of year	87.4	79.9
UNITED STATES | Alternative Investment [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0.1	0.1
Change in Plan Assets:
Fair value of plan assets at beginning of year	0.1
Fair value of plan assets at end of year	0.1	0.1
UNITED STATES | Level 1 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	1.2	1.2
Change in Plan Assets:
Fair value of plan assets at beginning of year	1.2
Fair value of plan assets at end of year	1.1	1.2
UNITED STATES | Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	1.2	1.2
Change in Plan Assets:
Fair value of plan assets at beginning of year	1.2
Fair value of plan assets at end of year	1.1	1.2
UNITED STATES | Level 1 [Member] | Alternative Investment [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Change in Plan Assets:
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
UNITED STATES | Level 2 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Change in Plan Assets:
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	56.3	0
UNITED STATES | Level 2 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Change in Plan Assets:
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
UNITED STATES | Level 2 [Member] | Fixed Income Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	56.3
Change in Plan Assets:
Fair value of plan assets at end of year	56.3
UNITED STATES | Level 2 [Member] | Alternative Investment [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Change in Plan Assets:
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
UNITED STATES | Level 3 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0.1	0.3
Change in Plan Assets:
Fair value of plan assets at beginning of year	0.1	0.3
Realized and unrealized gains	0	0
Purchases	0	0
Sales	0	(0.2)
Fair value of plan assets at end of year	0.1	0.1
UNITED STATES | Level 3 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Change in Plan Assets:
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
UNITED STATES | Level 3 [Member] | Alternative Investment [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0.1	0.1
Change in Plan Assets:
Fair value of plan assets at beginning of year	0.1
Fair value of plan assets at end of year	0.1	0.1
FRANCE
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	6.1	8.4
Change in Plan Assets:
Fair value of plan assets at beginning of year	6.1	8.4
Fair value of plan assets at end of year	3.2	6.1
FRANCE | Cash and Cash Equivalents [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	1.5	1.5
Change in Plan Assets:
Fair value of plan assets at beginning of year	1.5
Fair value of plan assets at end of year	1.2	1.5
FRANCE | Domestic Large Cap [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	1.2	1.2
Change in Plan Assets:
Fair value of plan assets at beginning of year	1.2
Fair value of plan assets at end of year	1	1.2
FRANCE | Domestic Small Cap [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Change in Plan Assets:
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
FRANCE | International [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Change in Plan Assets:
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
FRANCE | Fixed Income Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	3.2	3.2
Change in Plan Assets:
Fair value of plan assets at beginning of year	3.2
Fair value of plan assets at end of year	0.9	3.2
FRANCE | Alternative Investment [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0.2	0.2
Change in Plan Assets:
Fair value of plan assets at beginning of year	0.2
Fair value of plan assets at end of year	0.1	0.2
FRANCE | Level 1 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	2.7	2.7
Change in Plan Assets:
Fair value of plan assets at beginning of year	2.7
Fair value of plan assets at end of year	2.2	2.7
FRANCE | Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	1.5	1.5
Change in Plan Assets:
Fair value of plan assets at beginning of year	1.5
Fair value of plan assets at end of year	1.2	1.5
FRANCE | Level 1 [Member] | Domestic Large Cap [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	1.2	1.2
Change in Plan Assets:
Fair value of plan assets at beginning of year	1.2
Fair value of plan assets at end of year	1	1.2
FRANCE | Level 1 [Member] | Domestic Small Cap [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Change in Plan Assets:
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
FRANCE | Level 1 [Member] | International [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Change in Plan Assets:
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
FRANCE | Level 1 [Member] | Fixed Income Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Change in Plan Assets:
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
FRANCE | Level 1 [Member] | Alternative Investment [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Change in Plan Assets:
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
FRANCE | Level 2 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	3.4	3.4
Change in Plan Assets:
Fair value of plan assets at beginning of year	3.4
Fair value of plan assets at end of year	1	3.4
FRANCE | Level 2 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Change in Plan Assets:
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
FRANCE | Level 2 [Member] | Domestic Large Cap [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Change in Plan Assets:
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
FRANCE | Level 2 [Member] | Domestic Small Cap [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Change in Plan Assets:
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
FRANCE | Level 2 [Member] | International [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Change in Plan Assets:
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
FRANCE | Level 2 [Member] | Fixed Income Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	3.2	3.2
Change in Plan Assets:
Fair value of plan assets at beginning of year	3.2
Fair value of plan assets at end of year	0.9	3.2
FRANCE | Level 2 [Member] | Alternative Investment [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0.2	0.2
Change in Plan Assets:
Fair value of plan assets at beginning of year	0.2
Fair value of plan assets at end of year	0.1	0.2
Net Asset Value [Member] | UNITED STATES
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	117.6	117.6
Change in Plan Assets:
Fair value of plan assets at beginning of year	117.6
Fair value of plan assets at end of year	71.2	117.6
Net Asset Value [Member] | UNITED STATES | Domestic Large Cap [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	8.3	8.3
Change in Plan Assets:
Fair value of plan assets at beginning of year	8.3
Fair value of plan assets at end of year	9	8.3
Net Asset Value [Member] | UNITED STATES | Domestic Small Cap [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	5.7	5.7
Change in Plan Assets:
Fair value of plan assets at beginning of year	5.7
Fair value of plan assets at end of year	5.8	5.7
Net Asset Value [Member] | UNITED STATES | International [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	23.7	23.7
Change in Plan Assets:
Fair value of plan assets at beginning of year	23.7
Fair value of plan assets at end of year	25.3	23.7
Net Asset Value [Member] | UNITED STATES | Fixed Income Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	79.9	79.9
Change in Plan Assets:
Fair value of plan assets at beginning of year	79.9
Fair value of plan assets at end of year	$ 31.1	$ 79.9

Postretirement and Other Bene93

Postretirement and Other Benefits - Expected Future Benefit Payments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
UNITED STATES | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2,018	$ 8.5
2,019	8.4
2,020	8.3
2,021	8.3
2,022	8.2
2023 - 2027	39.1
Employer contributions	0	$ 0
UNITED STATES | Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2,018	0.2
2,019	0.1
2,020	0.1
2,021	0.1
2,022	0.1
2023 - 2027	0.3
Employer contributions	0.3	0.4
FRANCE | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2,018	1.4
2,019	2.1
2,020	0.7
2,021	1.3
2,022	0.9
2023 - 2027	7.7
Employer contributions	$ 1.9	$ 0.7

Postretirement and Other Bene94

Postretirement and Other Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Retirement Benefits [Abstract]
Defined contribution cost recognized	$ 3.6	$ 2.5	$ 2.5
Liability under deferred compensation plans	17.4	15.4
Grantor trust assets	12.2	10.3
Other liabilities, French law CET account	$ 5.6	$ 5.3

Stockholders' Equity - Restrict

Stockholders' Equity - Restricted Stock Plan (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock award, issued during period (in shares)	1,584,454
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, number of shares authorized (in shares)				5,000,000
Share-based payment award, limitation on single participant (in shares) (no more than)				750,000
Restricted stock award, not yet vested (in shares)	224,289	197,674	366,363	283,338
Unrecognized compensation expense				$ 2
Unrecognized compensation expense, recognition weighted average period	2 years 5 months
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Nonvested restricted shares outstanding at beginning of year (in shares)	224,289	197,674	366,363
Nonvested restricted shares granted (in shares)	216,017	150,647	107,346
Nonvested restricted shares forfeited (in shares)	(29,150)	(51,234)	(39,322)
Nonvested restricted shares vested (in shares)	(127,818)	(72,798)	(236,713)
Nonvested restricted shares outstanding at end of year (in shares)	283,338	224,289	197,674
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value, Outstanding at beginning of year (in dollars per share)	$ 41.30	$ 43.56	$ 38.24
Weighted Average Grant Date Fair Value, Granted (in dollars per share)	36.03	39.47	45.34
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share)	42.50	43.56	40.93
Weighted Average Grant Date Fair Value, Vested (in dollars per share)	41.06	42.06	36.57
Weighted Average Grant Date Fair Value, Outstanding at end of year (in dollars per share)	$ 37.26	$ 41.30	$ 43.56
Restricted Stock Performance Plan [Member] | Award Opportunity 2017-2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Nonvested restricted shares granted (in shares)	75,741
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Compensation expense	$ 1.7
Restricted Stock Performance Plan [Member] | Award Opportunity 2016-2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Nonvested restricted shares granted (in shares)		167,961
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Compensation expense	$ 2.2	$ 2.8
Restricted Stock Performance Plan [Member] | Award Opportunity 2015-2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Nonvested restricted shares granted (in shares)			71,228
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Compensation expense		$ 1.5	$ 1.8
Restricted Stock Performance Plan [Member] | Award Opportunity 2014-2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Compensation expense			$ 0.6

Stockholders' Equity - Basic an

Stockholders' Equity - Basic and Diluted Shares Reconciliation (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
Numerator (basic and diluted):
Net income	$ (27.3)	$ 25.8	$ 22.3	$ 13.7	$ 17	$ 18.7	$ 26	$ 21.1	$ 34.5	$ 82.8	$ 89.7
Less: Dividends paid to participating securities									(0.4)	(0.3)	(0.2)
Less: Undistributed earnings available to participating securities									0	(0.2)	(0.3)
Undistributed and distributed earnings available to common stockholders									$ 34.1	$ 82.3	$ 89.2
Denominator:
Average number of common shares outstanding (shares)									30,407,100	30,310,900	30,251,400
Effect of dilutive stock-based compensation (shares)									142,200	152,500	122,900
Average number of common and potential common shares outstanding (shares)									30,549,300	30,463,400	30,374,300

Commitments and Contingencies97

Commitments and Contingencies (Details)	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2017EUR (€)	Oct. 31, 2015USD ($)	Dec. 31, 2000assessment
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2,017	$ 6,200,000
2,018	5,200,000
2,019	4,800,000
2,020	4,200,000
2,021	3,700,000
Thereafter	9,700,000
Total	33,800,000
Rent expense	6,400,000	$ 6,900,000	$ 6,800,000
Loss Contingencies [Line Items]
Capital expenditures for environmental matters	1,100,000
Capital expenditures for environmental matters, due in two years (less than)	1,000,000
Unfavorable Regulatory Action [Member] | Raw Materials Assessment [Member]
Loss Contingencies [Line Items]
Number of assessments from the tax authorities regarding ICMS taxes | assessment						2
Number of tax assessments related to periods that predated acquisition and are covered by indemnification | assessment						1
Unfavorable Regulatory Action [Member] | Electricity Assessment [Member]
Loss Contingencies [Line Items]
Number of assessments from the tax authorities regarding ICMS taxes | assessment						3
LTRI and PdM Subsidiaries [Member] | Energy Cogeneration Steam Supply Agreement [Member]
Loss Contingencies [Line Items]
Minimum annual commitments	2,000,000
SWM-B Brazilian Mill [Member] | Transmission and Distribution of Energy Agreement [Member]
Loss Contingencies [Line Items]
Purchase of electrical energy, estimated annual cost	3,000,000
French Mills [Member] | Transmission and Distribution of Energy Agreement [Member]
Loss Contingencies [Line Items]
Estimated due within one year	3,000,000
Calcium Carbonate [Member] | PdM Subsidiary [Member]
Loss Contingencies [Line Items]
Purchase commitment, remaining amount committed	2,000,000
Calcium Carbonate, Through 2024 [Member] | PdM Subsidiary [Member]
Loss Contingencies [Line Items]
Purchase commitment, remaining amount committed	11,000,000
Maximum [Member] | Unfavorable Regulatory Action [Member] | Raw Materials Assessment [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss					$ 16,000,000
Maximum [Member] | Unfavorable Regulatory Action [Member] | Raw Materials Assessment 2 [Member] [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	12,700,000
Maximum [Member] | Unfavorable Regulatory Action [Member] | Electricity Assessment One [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	5,500,000
Maximum [Member] | Unfavorable Regulatory Action [Member] | Electricity Assessment Two [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	9,100,000
Maximum [Member] | Unfavorable Regulatory Action [Member] | Electricity Assessment Three [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 4,400,000
Maximum [Member] | Unfavorable Regulatory Action [Member] | Malaucene Co-Employment [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss | €				€ 1,300,000
Loss Contingency, Pending Claims, Number	18
Biomass Consumption [Member] | French Mills [Member]
Loss Contingencies [Line Items]
Minimum annual commitments	$ 2,000,000

Segment Information (Details)

Segment Information (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2017USD ($)segment	Dec. 31, 2016USD ($)segment	Dec. 31, 2015USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment									2
Number of reportable segments | segment									2	2
Net Sales [Abstract]
Net sales	$ 235.7	$ 257.8	$ 255.3	$ 233.3	$ 198.7	$ 209.3	$ 217.3	$ 214.6	$ 982.1	$ 839.9	$ 764.1
Percentage of Net Sales									100.00%	100.00%	100.00%
Operating Profit [Abstract]
Operating profit	20.1	$ 38.5	$ 39.5	$ 26.6	6.2	$ 30.8	$ 37.5	$ 31.6	$ 124.7	$ 106.1	$ 103
Percentage of Operating Profit									100.00%	100.00%	100.00%
Segment Assets	1,542.5				1,173.7				$ 1,542.5	$ 1,173.7	$ 1,290
Capital Spending									37.2	27.8	24.2
Depreciation									35.7	29.4	30.7
Long-Lived Assets	369.3				311.8				369.3	311.8	310.6
United States [Member]
Net Sales [Abstract]
Net sales									468.9	372.2	310.7
Operating Profit [Abstract]
Long-Lived Assets	115				89.6				115	89.6	87.5
France [Member]
Operating Profit [Abstract]
Long-Lived Assets	181.3				162.7				181.3	162.7	163.5
Brazil [Member]
Operating Profit [Abstract]
Long-Lived Assets	24.2				23.7				24.2	23.7	20.1
Poland [Member]
Operating Profit [Abstract]
Long-Lived Assets	21.9				20				21.9	20	23.6
Europe and the former Commonwealth of Independent States [Member]
Net Sales [Abstract]
Net sales									259.9	253.2	261.2
Asia/Pacific (including China) [Member]
Net Sales [Abstract]
Net sales									148.4	129.4	118.5
Latin America [Member]
Net Sales [Abstract]
Net sales									57.9	47.4	34.6
Other foreign countries [Member]
Net Sales [Abstract]
Net sales									47	37.7	39.1
Operating Profit [Abstract]
Long-Lived Assets	26.9				15.8				26.9	15.8	15.9
Operating Segments [Member] | Engineered Papers [Member]
Net Sales [Abstract]
Net sales									$ 548.9	$ 559.3	$ 583.9
Percentage of Net Sales									55.90%	66.60%	76.40%
Operating Profit [Abstract]
Operating profit									$ 116.1	$ 138	$ 121.5
Percentage of Operating Profit									93.10%	130.00%	118.00%
Segment Assets	537.6				569.3				$ 537.6	$ 569.3	$ 507.3
Capital Spending									25.6	17.6	12.5
Depreciation									23.4	22.3	25.6
Operating Segments [Member] | Advanced Materials & Structures [Member]
Net Sales [Abstract]
Net sales									$ 433.2	$ 280.6	$ 180.2
Percentage of Net Sales									44.10%	33.40%	23.60%
Operating Profit [Abstract]
Operating profit									$ 48.5	$ 9	$ 16.7
Percentage of Operating Profit									38.90%	8.50%	16.20%
Segment Assets	811.7				505.1				$ 811.7	$ 505.1	$ 648.4
Capital Spending									11.5	10.1	11.2
Depreciation									12.3	7.1	5.5
Unallocated [Member]
Operating Profit [Abstract]
Operating profit									$ (39.9)	$ (40.9)	$ (35.2)
Percentage of Operating Profit									(32.00%)	(38.50%)	(34.20%)
Segment Assets	$ 193.2				$ 99.3				$ 193.2	$ 99.3	$ 134.3
Capital Spending									0.1	0.1	0.5
Depreciation									$ 0	$ 0	$ (0.4)

Major Customers (Details)

Major Customers (Details) - Customer Concentration Risk [Member] - Phillip Morris, British American, and Japan Tobacco [Member]	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Sales [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	23.00%	18.00%	42.00%
Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	12.00%

Supplemental Disclosures (Detai

Supplemental Disclosures (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for Doubtful Accounts
Interest paid	$ 22.7	$ 13.3	$ 7.8
Income taxes paid	38.1	31.9	9.3
Capital spending in accounts payable and accrued liabilities	7.7	8.8	2.6
Business Combination, Consideration Transferred, Other	8.6	0	0
Allowance for Doubtful Accounts [Member]
Allowance for Doubtful Accounts
Beginning balance	0.8	0.4	0.3
Bad debt expense	0.8	0.4	0.2
Write-offs and discounts	(0.6)	0	(0.1)
Currency translation	0	0	0
Ending balance	$ 1	$ 0.8	$ 0.4

Quarterly Financial Informat101

Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 235.7	$ 257.8	$ 255.3	$ 233.3	$ 198.7	$ 209.3	$ 217.3	$ 214.6	$ 982.1	$ 839.9	$ 764.1
Gross profit	66.8	75.8	76.6	63.1	63.2	63.1	66.9	63.5	282.3	256.7	224.4
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
Operating profit	20.1	38.5	39.5	26.6	6.2	30.8	37.5	31.6	124.7	106.1	103
Income (loss) from continuing operations	(27.3)	25.7	22.3	13.7	17	18.7	26	21.1	34.4	82.8	90.5
Gain (loss) from discontinued operations	0	0.1	0	0	0	0	0	0	0.1	0	(0.8)
Net income	$ (27.3)	$ 25.8	$ 22.3	$ 13.7	$ 17	$ 18.7	$ 26	$ 21.1	$ 34.5	$ 82.8	$ 89.7
Income (loss) per share from continuing operations - basic (in dollars per share)	$ (0.90)	$ 0.84	$ 0.73	$ 0.45	$ 0.55	$ 0.62	$ 0.85	$ 0.69	$ 1.12	$ 2.71	$ 2.97
(Loss) income per share from discontinued operations - basic (in dollars per share)	0	0	0	0	0	0	0	0	0	0	(0.02)
Net income per share - basic (in dollars per share)	(0.90)	0.84	0.73	0.45	0.55	0.62	0.85	0.69	1.12	2.71	2.95
Income (loss) per share from continuing operations - diluted (in dollars per share)	(0.89)	0.84	0.72	0.45	0.55	0.61	0.85	0.69	1.12	2.70	2.96
(Loss) income per share from discontinued operations - diluted (in dollars per share)	0	0	0	0	0	0	0	0	0	0	(0.02)
Net income per share - diluted (in dollars per share)	$ (0.89)	$ 0.84	$ 0.72	$ 0.45	$ 0.55	$ 0.61	$ 0.85	$ 0.69	$ 1.12	$ 2.70	$ 2.94