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Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Royalty Income [Abstract]
Royalty Income	$ 11.1us-gaap_RoyaltyRevenue	$ 11.2us-gaap_RoyaltyRevenue	$ 12.4us-gaap_RoyaltyRevenue
Foreign Currency Translation [Abstract]
Foreign Currency Transaction Gain From Remeasurement and Settlement	1.5us-gaap_ForeignCurrencyTransactionGainBeforeTax	1.3us-gaap_ForeignCurrencyTransactionGainBeforeTax
Foreign Currency Transaction Loss From Remeasurement and Settlement			1.4us-gaap_ForeignCurrencyTransactionLossBeforeTax
Acquisition Costs	2.6us-gaap_BusinessCombinationAcquisitionRelatedCosts	1.1us-gaap_BusinessCombinationAcquisitionRelatedCosts
Capitalized Computer Software [Abstract]
Capitalized Computer Software, Useful Life	7 years
Capitalized Computer Software, Amortization	3.4us-gaap_CapitalizedComputerSoftwareAmortization	4.8us-gaap_CapitalizedComputerSoftwareAmortization	6.6us-gaap_CapitalizedComputerSoftwareAmortization
Capitalized Computer Software, Accumulated Amortization	$ 60.5us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization	$ 60.9us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization
China [Member]
Principles of Consolidation [Abstract]
Number of Joint Ventures	2swm_NumberOfJointVentures / dei_EntityByLocationAxis = swm_ChinaMember
Equity Method Investment, Ownership Percentage	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_EntityByLocationAxis = swm_ChinaMember
China [Member] | CTM [Member]
Principles of Consolidation [Abstract]
Equity Method Investment, Ownership Percentage	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_EntityByLocationAxis = swm_ChinaMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = swm_CtmMember
Restricted Stock Performance Plan [Member] | Minimum [Member]
Capitalized Computer Software [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Performance Period	1 year
Restricted Stock Performance Plan [Member] | Maximum [Member]
Capitalized Computer Software [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Performance Period	2 years

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount before tax of foreign currency transaction realized and unrealized gain recognized in the income statement.

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Revenue earned during the period from the leasing or otherwise lending to a third party the entity's rights or title to certain property. Royalty revenue is derived from a percentage or stated amount of sales proceeds or revenue generated by the third party using the entity's property. Examples of property from which royalties may be derived include patents and oil and mineral rights.

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