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Income Taxes - Reconciliation of Income Tax Rate (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Amount [Abstract]
Tax provision at U.S. statutory rate	$ 37.9us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 44.7us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 52.4us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Foreign income tax rate differential	(16.1)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	8.2us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(4.5)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Tax effect of foreign legal structure	(0.4)swm_IncomeTaxReconciliationTaxExpenseBenefitOfChangeInForeignLegalStructure	0swm_IncomeTaxReconciliationTaxExpenseBenefitOfChangeInForeignLegalStructure	0swm_IncomeTaxReconciliationTaxExpenseBenefitOfChangeInForeignLegalStructure
Domestic production deduction	(1.0)us-gaap_IncomeTaxReconciliationTaxHolidays	(0.9)us-gaap_IncomeTaxReconciliationTaxHolidays	(1.0)us-gaap_IncomeTaxReconciliationTaxHolidays
Adjustments to valuation allowances	0.4us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	1.2us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	0us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
French business tax classified as income tax	1.7swm_IncomeTaxReconciliationFrenchBusinessTaxReclassifiedAsIncomeTax	2.2swm_IncomeTaxReconciliationFrenchBusinessTaxReclassifiedAsIncomeTax	2.4swm_IncomeTaxReconciliationFrenchBusinessTaxReclassifiedAsIncomeTax
Other foreign taxes, net	(0.6)swm_IncomeTaxReconciliationOtherForeignTaxesNet	(1.4)swm_IncomeTaxReconciliationOtherForeignTaxesNet	(0.7)swm_IncomeTaxReconciliationOtherForeignTaxesNet
Other, net	(1.4)us-gaap_IncomeTaxReconciliationOtherAdjustments	(1.0)us-gaap_IncomeTaxReconciliationOtherAdjustments	0.9us-gaap_IncomeTaxReconciliationOtherAdjustments
Provision for income taxes	20.5us-gaap_IncomeTaxExpenseBenefit	53.0us-gaap_IncomeTaxExpenseBenefit	49.5us-gaap_IncomeTaxExpenseBenefit
Percent [Abstract]
Tax provision at U.S. statutory rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Foreign income tax rate differential	(14.90%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	6.40%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	(3.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Tax effect of foreign legal structure	(0.40%)swm_EffectiveIncomeTaxRateReconciliationTaxExpenseBenefitOfChangeInForeignLegalStructure	0.00%swm_EffectiveIncomeTaxRateReconciliationTaxExpenseBenefitOfChangeInForeignLegalStructure	0.00%swm_EffectiveIncomeTaxRateReconciliationTaxExpenseBenefitOfChangeInForeignLegalStructure
Domestic production deduction	(0.90%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxHolidays	(0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxHolidays	(0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxHolidays
Adjustments to valuation allowances	0.40%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.90%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
French business tax classified as income tax	1.60%swm_EffectiveIncomeTaxRateReconciliationFrenchBusinessTaxReclassifiedAsIncomeTax	1.70%swm_EffectiveIncomeTaxRateReconciliationFrenchBusinessTaxReclassifiedAsIncomeTax	1.60%swm_EffectiveIncomeTaxRateReconciliationFrenchBusinessTaxReclassifiedAsIncomeTax
Other foreign taxes, net	(0.60%)swm_EffectiveIncomeTaxRateReconciliationOtherForeignTaxesNet	(1.10%)swm_EffectiveIncomeTaxRateReconciliationOtherForeignTaxesNet	(0.50%)swm_EffectiveIncomeTaxRateReconciliationOtherForeignTaxesNet
Other, net	(1.30%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.70%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Provision for income taxes	18.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations	41.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations	33.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Poland Tax Credit Carryforwards [Member]
Percent [Abstract]
Increase in valuation allowance		$ 1.2us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = swm_TaxCreditCarryforwardsForeignPolandMember

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The effect on the effective income tax rate due to the tax expense (benefit) of a change in foreign legal structure.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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