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v2.4.1.9

Postretirement and Other Benefits (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract] |  |  |
Defined Contribution Plan, Cost Recognized | $ 2.0 us-gaap_DefinedContributionPlanCostRecognized | $ 1.8 us-gaap_DefinedContributionPlanCostRecognized | $ 1.7 us-gaap_DefinedContributionPlanCostRecognized
Deferred Compensation Liability, Classified, Noncurrent | 13.1 us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent | 13.4 us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent |
Deferred Compensation Plan Assets | 10.3 us-gaap_DeferredCompensationPlanAssets | 10.0 us-gaap_DeferredCompensationPlanAssets |
Other Liabilities, French Law CET Account | $ 8.1 swm_OtherLiabilitiesFrenchLawCetAccount | $ 8.9 swm_OtherLiabilitiesFrenchLawCetAccount |

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- Definition Other Liabilities, French Law CET Account + References No definition available. + Details
Name: | swm_OtherLiabilitiesFrenchLawCetAccount
Namespace Prefix: | swm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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Period Type: | duration