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Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2013	Dec. 31, 2013
Assets of discontinued operations:
Current assets	$ 1.6us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	$ 2.0us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent			$ 2.0us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Other assets	2.3us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets	3.1us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets			3.1us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets
Liabilities of discontinued operations:
Current liabilities	0.1us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	0.6us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent			0.6us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
Restructuring and impairment expense	11.2us-gaap_RestructuringCharges	3.9us-gaap_RestructuringCharges
Philippines Paper & Indonesia [Member]
Liabilities of discontinued operations:
Net sales	0us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = swm_PhilippinesPaperIndonesiaMember	7.1us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = swm_PhilippinesPaperIndonesiaMember	24.8us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = swm_PhilippinesPaperIndonesiaMember
Restructuring and impairment expense	0us-gaap_RestructuringCharges / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = swm_PhilippinesPaperIndonesiaMember	1.4us-gaap_RestructuringCharges / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = swm_PhilippinesPaperIndonesiaMember	14.0us-gaap_RestructuringCharges / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = swm_PhilippinesPaperIndonesiaMember
Loss from discontinued operations before income taxes	0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = swm_PhilippinesPaperIndonesiaMember	(2.6)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = swm_PhilippinesPaperIndonesiaMember	(23.2)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = swm_PhilippinesPaperIndonesiaMember
Income tax benefit (provision)	0us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = swm_PhilippinesPaperIndonesiaMember	0.2us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = swm_PhilippinesPaperIndonesiaMember	(1.1)us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = swm_PhilippinesPaperIndonesiaMember
(Loss) income from discontinued operations	0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = swm_PhilippinesPaperIndonesiaMember	(2.4)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = swm_PhilippinesPaperIndonesiaMember	(24.3)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = swm_PhilippinesPaperIndonesiaMember
Indonesia Mill [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax				(1.6)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = swm_IndonesiaMillMember
Philippines Mill [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax					$ 1.6us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = swm_PhilippinesMillMember

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Pretax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal.

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Income tax expense or benefit attributable to Income or Loss from discontinued operations during the phase-out period.

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