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Goodwill - Carrying Amount of Goodwill By Segment (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 reportable_unit | Dec. 31, 2013
Goodwill [Line Items] |  |
Number of reportable units with goodwill | 2 swm_NumberofReportableSegmentsWithGoodwill |
Goodwill [Roll Forward] |  |
Goodwill beginning of period, net | $ 121,100,000 us-gaap_Goodwill | $ 5,700,000 us-gaap_Goodwill
Goodwill acquired during the year | 5,000,000 us-gaap_GoodwillAcquiredDuringPeriod | 115,100,000 us-gaap_GoodwillAcquiredDuringPeriod
Foreign currency translation adjustments | (600,000)us-gaap_GoodwillTranslationAdjustments | 300,000 us-gaap_GoodwillTranslationAdjustments
Goodwill end of period, net | 125,500,000 us-gaap_Goodwill | 121,100,000 us-gaap_Goodwill
Paper [Member] |  |
Goodwill [Line Items] |  |
Accumulated impairment losses | 2,700,000 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember |
Reconstituted Tobacco [Member] |  |
Goodwill [Line Items] |  |
Accumulated impairment losses | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember |
Goodwill [Roll Forward] |  |
Goodwill beginning of period, net | 6,000,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember | 5,700,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember
Goodwill acquired during the year | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember
Foreign currency translation adjustments | (700,000)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember | 300,000 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember
Goodwill end of period, net | 5,300,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember | 6,000,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember
Filtration [Member] |  |
Goodwill [Line Items] |  |
Accumulated impairment losses | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember |
Goodwill [Roll Forward] |  |
Goodwill beginning of period, net | 115,100,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember
Goodwill acquired during the year | 5,000,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember | 115,100,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember
Foreign currency translation adjustments | 100,000 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember
Goodwill end of period, net | $ 120,200,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember | $ 115,100,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember

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- Definition Number of Reportable Segments With Goodwill + References No definition available. + Details
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Namespace Prefix: | swm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Details
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Balance Type: | na
Period Type: | duration

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- Definition Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |