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Business Acquisitions - Acquired Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 12, 2013
Dec. 31, 2013
Pronamic And SNN [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]      
Preliminary Fair Value $ 11.6us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= swm_PronamicAndSNNMember
   
Weighted-Average Amortization Period (Years) 15 years    
Pronamic And SNN [Member] | Customer relationships [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]      
Preliminary Fair Value 6.1us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= swm_PronamicAndSNNMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
   
Weighted-Average Amortization Period (Years) 15 years    
Pronamic And SNN [Member] | Developed Technology [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]      
Preliminary Fair Value 2.1us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= swm_PronamicAndSNNMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
   
Weighted-Average Amortization Period (Years) 20 years    
Pronamic And SNN [Member] | Patents [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]      
Preliminary Fair Value 1.5us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= swm_PronamicAndSNNMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
   
Weighted-Average Amortization Period (Years) 17 years    
Pronamic And SNN [Member] | Customer contracts [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]      
Preliminary Fair Value 1.9us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= swm_PronamicAndSNNMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerContractsMember
   
Weighted-Average Amortization Period (Years) 6 years    
DelStar [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]      
Preliminary Fair Value   80.9us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= swm_DelStarMember
 
Weighted-Average Amortization Period (Years)   21 years  
Acquisition Costs      
Business Acquisition, Transaction Costs 1.3us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= swm_DelStarMember
  1.1us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= swm_DelStarMember
Business Combination, Financing Costs     2.0swm_BusinessCombinationFinancingCosts
/ us-gaap_BusinessAcquisitionAxis
= swm_DelStarMember
DelStar [Member] | Trade names [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]      
Preliminary Fair Value   21.8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= swm_DelStarMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
 
DelStar [Member] | Customer relationships [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]      
Preliminary Fair Value   45.3us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= swm_DelStarMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
 
Weighted-Average Amortization Period (Years)   23 years  
DelStar [Member] | Developed Technology [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]      
Preliminary Fair Value   $ 13.8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= swm_DelStarMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
 
Weighted-Average Amortization Period (Years)   12 years 9 months 18 days