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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 | $ 11.1 us-gaap_RoyaltyRevenue | $ 11.2 us-gaap_RoyaltyRevenue | $ 12.4 us-gaap_RoyaltyRevenue
Foreign Currency Translation [Abstract] |  |  |
Foreign Currency Transaction Gain From Remeasurement and Settlement | 1.5 us-gaap_ForeignCurrencyTransactionGainBeforeTax | 1.3 us-gaap_ForeignCurrencyTransactionGainBeforeTax |
Foreign Currency Transaction Loss From Remeasurement and Settlement |  |  | 1.4 us-gaap_ForeignCurrencyTransactionLossBeforeTax
Acquisition Costs | 2.6 us-gaap_BusinessCombinationAcquisitionRelatedCosts | 1.1 us-gaap_BusinessCombinationAcquisitionRelatedCosts |
Capitalized Computer Software [Abstract] |  |  |
Capitalized Computer Software, Useful Life | 7 years |  |
Capitalized Computer Software, Amortization | 3.4 us-gaap_CapitalizedComputerSoftwareAmortization | 4.8 us-gaap_CapitalizedComputerSoftwareAmortization | 6.6 us-gaap_CapitalizedComputerSoftwareAmortization
Capitalized Computer Software, Accumulated Amortization | $ 60.5 us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization | $ 60.9 us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization |
China [Member] |  |  |
Principles of Consolidation [Abstract] |  |  |
Number of Joint Ventures | 2 swm_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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition Amount before tax of foreign currency transaction realized and unrealized gain recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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