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Restructuring Activities (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]      
Restructuring and Impairment $ 4.0us-gaap_RestructuringSettlementAndImpairmentProvisions $ 0.1us-gaap_RestructuringSettlementAndImpairmentProvisions  
Restructuring Reserve [Roll Forward]      
Balance at beginning of year 8.7us-gaap_RestructuringReserve 4.7us-gaap_RestructuringReserve 4.7us-gaap_RestructuringReserve
Accruals for announced programs 3.3us-gaap_RestructuringCharges   11.2us-gaap_RestructuringCharges
Cash payments (1.1)us-gaap_PaymentsForRestructuring   (6.3)us-gaap_PaymentsForRestructuring
Exchange rate impacts (1.0)us-gaap_RestructuringReserveTranslationAdjustment   (0.9)us-gaap_RestructuringReserveTranslationAdjustment
Balance at end of period 9.9us-gaap_RestructuringReserve   8.7us-gaap_RestructuringReserve
Reconstituted Tobacco [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and Impairment 3.8us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= swm_ReconstitutedTobaccoMember
0.1us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= swm_ReconstitutedTobaccoMember
 
Corporate, Non-Segment [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and Impairment $ 0.2us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateNonSegmentMember