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Income Taxes - Deferred Tax Assets (Liabilities) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Contingency [Line Items]      
Income Tax Holiday, Aggregate Dollar Amount   $ 13.4us-gaap_IncomeTaxHolidayAggregateDollarAmount $ 2.0us-gaap_IncomeTaxHolidayAggregateDollarAmount
Income Tax Holiday, Income Tax Benefits Per Share (in dollars per share)   $ 0.43us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare $ 0.06us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare
Components of Deferred Tax Assets and Liabilities      
Inventories 0.6us-gaap_DeferredTaxAssetsInventory (1.0)us-gaap_DeferredTaxAssetsInventory  
Postretirement and other employee benefits 3.1us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 1.9us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits  
Other accrued liabilities 4.3us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 6.0us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther  
Valuation allowances (0.7)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent (3.0)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent  
Foreign tax incentives 0swm_DeferredTaxAssetsForeignTaxIncentives 2.3swm_DeferredTaxAssetsForeignTaxIncentives  
Other 1.9us-gaap_DeferredTaxAssetsOther 3.9us-gaap_DeferredTaxAssetsOther  
Net current deferred income tax assets 9.2us-gaap_DeferredTaxAssetsNetCurrent 10.1us-gaap_DeferredTaxAssetsNetCurrent  
Operating loss carryforwards 17.7us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 8.8us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Tax credit carryforwards 0us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 0us-gaap_DeferredTaxAssetsTaxCreditCarryforwards  
Postretirement and other employee benefits 0.3swm_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefitsNoncurrent 0swm_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefitsNoncurrent  
Accumulated depreciation, amortization and impairment 10.8swm_DeferredTaxAssetsAccumulatedDepreciationAndAmortization 0swm_DeferredTaxAssetsAccumulatedDepreciationAndAmortization  
Valuation allowances (28.7)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent (9.8)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent  
Other (0.1)swm_DeferredTaxAssetsOtherNoncurrent 1.0swm_DeferredTaxAssetsOtherNoncurrent  
Net noncurrent deferred income tax assets 0us-gaap_DeferredTaxAssetsNetNoncurrent 0us-gaap_DeferredTaxAssetsNetNoncurrent  
Accumulated depreciation and amortization (70.3)swm_DeferredTaxLiabilitiesAccumulatedDepreciationAndAmortization (74.3)swm_DeferredTaxLiabilitiesAccumulatedDepreciationAndAmortization  
Operating loss carryforwards 8.9swm_DeferredTaxLiabilityOperatingLossCarryforwards 14.3swm_DeferredTaxLiabilityOperatingLossCarryforwards  
Valuation allowance (7.8)swm_DeferredTaxLiabilitiesValuationAllowance (7.5)swm_DeferredTaxLiabilitiesValuationAllowance  
Postretirement and other employee benefits 16.2swm_DeferredTaxLiabilityDeferredExpenseCompensationAndBenefitsPostretirementBenefits 13.1swm_DeferredTaxLiabilityDeferredExpenseCompensationAndBenefitsPostretirementBenefits  
Basis difference of acquired intangible assets (22.1)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (29.9)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets  
Other 3.7us-gaap_DeferredTaxLiabilitiesOther 3.4us-gaap_DeferredTaxLiabilitiesOther  
Net noncurrent deferred income tax liabilities (71.4)us-gaap_DeferredTaxLiabilitiesNoncurrent (80.9)us-gaap_DeferredTaxLiabilitiesNoncurrent  
Deferred income tax assets 90.1us-gaap_DeferredTaxAssetsGross 43.1us-gaap_DeferredTaxAssetsGross  
Deferred income tax liabilities 152.3swm_DeferredTaxLiabilityGross 113.9swm_DeferredTaxLiabilityGross  
Operating loss carryforwards 97.5us-gaap_OperatingLossCarryforwards    
Reconciliation of Unrecognized Tax Benefits [Roll Forward]      
Uncertain tax position balance at beginning of year 1.8us-gaap_LiabilityForUncertainTaxPositionsNoncurrent    
Increases related to current year tax positions 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions    
Uncertain tax position balance at end of year 1.8us-gaap_LiabilityForUncertainTaxPositionsNoncurrent 1.8us-gaap_LiabilityForUncertainTaxPositionsNoncurrent  
Internal Revenue Service (IRS) [Member]      
Components of Deferred Tax Assets and Liabilities      
Operating loss carryforwards 11.7us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		    
Spain NOLs [Member]      
Components of Deferred Tax Assets and Liabilities      
Operating loss carryforwards 43.4us-gaap_OperatingLossCarryforwards
/ us-gaap_TaxCreditCarryforwardAxis
= swm_SpainNolsMember		    
Philippines NOLs [Member]      
Components of Deferred Tax Assets and Liabilities      
Operating loss carryforwards 18.4us-gaap_OperatingLossCarryforwards
/ us-gaap_TaxCreditCarryforwardAxis
= swm_PhilippinesNolsMember		    
Expiration period of operating loss carryforwards 3 years    
France NOL [Member]      
Components of Deferred Tax Assets and Liabilities      
Operating loss carryforwards 3.3us-gaap_OperatingLossCarryforwards
/ us-gaap_TaxCreditCarryforwardAxis
= swm_FranceNolMember		    
Brazil NOL [Member]      
Components of Deferred Tax Assets and Liabilities      
Operating loss carryforwards 20.7us-gaap_OperatingLossCarryforwards
/ us-gaap_TaxCreditCarryforwardAxis
= swm_BrazilNolMember		    
Valuation Allowance, Operating Loss Carryforwards [Member] | Spain NOLs [Member]      
Components of Deferred Tax Assets and Liabilities      
Deferred tax asset valuation allowance 12.2us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_TaxCreditCarryforwardAxis
= swm_SpainNolsMember
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_ValuationAllowanceOperatingLossCarryforwardsMember		    
Valuation Allowance, Operating Loss Carryforwards [Member] | Philippines NOLs [Member]      
Components of Deferred Tax Assets and Liabilities      
Deferred tax asset valuation allowance 16.5us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_TaxCreditCarryforwardAxis
= swm_PhilippinesNolsMember
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_ValuationAllowanceOperatingLossCarryforwardsMember		    
Valuation Allowance, Operating Loss Carryforwards [Member] | Brazil NOL [Member]      
Components of Deferred Tax Assets and Liabilities      
Deferred tax asset valuation allowance $ 7.9us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_TaxCreditCarryforwardAxis
= swm_BrazilNolMember
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_ValuationAllowanceOperatingLossCarryforwardsMember