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Restructuring and Impairment Activities (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]                      
Restructuring and Impairment $ 6,500,000us-gaap_RestructuringSettlementAndImpairmentProvisions $ 3,300,000us-gaap_RestructuringSettlementAndImpairmentProvisions $ 3,200,000us-gaap_RestructuringSettlementAndImpairmentProvisions $ 100,000us-gaap_RestructuringSettlementAndImpairmentProvisions $ 38,400,000us-gaap_RestructuringSettlementAndImpairmentProvisions $ 600,000us-gaap_RestructuringSettlementAndImpairmentProvisions $ 700,000us-gaap_RestructuringSettlementAndImpairmentProvisions $ 1,600,000us-gaap_RestructuringSettlementAndImpairmentProvisions $ 13,100,000us-gaap_RestructuringSettlementAndImpairmentProvisions $ 41,300,000us-gaap_RestructuringSettlementAndImpairmentProvisions $ 21,400,000us-gaap_RestructuringSettlementAndImpairmentProvisions
Restructuring Reserve [Roll Forward]                      
Balance at beginning of year       4,700,000us-gaap_RestructuringReserve       3,400,000us-gaap_RestructuringReserve 4,700,000us-gaap_RestructuringReserve 3,400,000us-gaap_RestructuringReserve  
Accruals for announced programs                 11,200,000us-gaap_RestructuringCharges 3,900,000us-gaap_RestructuringCharges  
Cash payments                 (6,300,000)us-gaap_PaymentsForRestructuring (2,700,000)us-gaap_PaymentsForRestructuring  
Exchange rate impacts                 (900,000)us-gaap_RestructuringReserveTranslationAdjustment 100,000us-gaap_RestructuringReserveTranslationAdjustment  
Balance at end of period 8,700,000us-gaap_RestructuringReserve       4,700,000us-gaap_RestructuringReserve       8,700,000us-gaap_RestructuringReserve 4,700,000us-gaap_RestructuringReserve 3,400,000us-gaap_RestructuringReserve
Employee Severance [Member] | France, Brazil, And United States [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring and Impairment                 2,600,000us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
/ us-gaap_StatementGeographicalAxis
= swm_FranceBrazilAndUnitedStatesMember
   
Employee Severance [Member] | France [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring and Impairment                   1,600,000us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
/ us-gaap_StatementGeographicalAxis
= country_FR
 
Facility Closing [Member] | Lee Mills And Golden Hills Manufacturing Facilities [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring and Impairment                 1,000,000us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= swm_LeeMillsAndGoldenHillsManufacturingFacilitiesMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
   
Other Restructuring [Member] | Canada Manufacturing Facility [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring and Impairment                 900,000us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= swm_CanadaManufacturingFacilityMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember
   
Paper [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring and Impairment                 4,500,000us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= swm_PaperSegmentMember
2,400,000us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= swm_PaperSegmentMember
17,900,000us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= swm_PaperSegmentMember
Paper [Member] | Spotswood Mill [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Impairment of Long-Lived Assets to be Disposed of                     16,900,000us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ swm_PaperMillsAxis
= swm_SpotswoodMillMember
/ us-gaap_StatementBusinessSegmentsAxis
= swm_PaperSegmentMember
Reconstituted Tobacco [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring and Impairment                 6,800,000us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= swm_ReconstitutedTobaccoMember
38,600,000us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= swm_ReconstitutedTobaccoMember
4,100,000us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= swm_ReconstitutedTobaccoMember
Impairment of Long-Lived Assets to be Disposed of                   37,200,000us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ us-gaap_StatementBusinessSegmentsAxis
= swm_ReconstitutedTobaccoMember
3,100,000us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ us-gaap_StatementBusinessSegmentsAxis
= swm_ReconstitutedTobaccoMember
Filtration [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring and Impairment                 400,000us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= swm_FiltrationSegmentMember
0us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= swm_FiltrationSegmentMember
0us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= swm_FiltrationSegmentMember
Corporate, Non-Segment [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring and Impairment                 $ 1,400,000us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateNonSegmentMember