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

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