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Other Assets (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Other Assets [Abstract]    
Capitalized software costs, net of accumulated amortization $ 3.8us-gaap_CapitalizedComputerSoftwareNet $ 7.0us-gaap_CapitalizedComputerSoftwareNet
Business tax credits, including VAT and ICMS (net of $11.7 million and $13.8 million reserve as of December 31, 2014 and 2013, respectively) 2.5swm_BusinessTaxCredits 3.1swm_BusinessTaxCredits
Grantor trust assets 10.3us-gaap_DeferredCompensationPlanAssets 10.0us-gaap_DeferredCompensationPlanAssets
Net pension assets 0us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent 4.4us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
Other assets 6.0us-gaap_OtherAssetsMiscellaneous 7.1us-gaap_OtherAssetsMiscellaneous
Total 22.6us-gaap_OtherAssetsNoncurrent 31.6us-gaap_OtherAssetsNoncurrent
Additional Information    
Reserve for losses on business tax credits $ 11.7swm_ReserveForLossesOnBusinessTaxCredits $ 13.8swm_ReserveForLossesOnBusinessTaxCredits