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Commitments, Contingent Liabilities and Other Matters (Details 3) (Site investigation and remediation)
Dec. 31, 2014
site
Dec. 31, 2013
site
Site investigation and remediation
    
Environmental Matters    
Number of sites 91spw_SiteContingencyNumberOfSites
/ us-gaap_EnvironmentalRemediationContingencyAxis
= us-gaap_EnvironmentalIssueMember		 94spw_SiteContingencyNumberOfSites
/ us-gaap_EnvironmentalRemediationContingencyAxis
= us-gaap_EnvironmentalIssueMember
Number of third-party disposal sites for which entity is potentially responsible 28spw_SiteContingencyNumberOfSitesOnWhichEntityPotentiallyResponsible
/ us-gaap_EnvironmentalRemediationContingencyAxis
= us-gaap_EnvironmentalIssueMember		 23spw_SiteContingencyNumberOfSitesOnWhichEntityPotentiallyResponsible
/ us-gaap_EnvironmentalRemediationContingencyAxis
= us-gaap_EnvironmentalIssueMember
Number of active sites 9spw_SiteContingencyNumberOfActiveSites
/ us-gaap_EnvironmentalRemediationContingencyAxis
= us-gaap_EnvironmentalIssueMember		 6spw_SiteContingencyNumberOfActiveSites
/ us-gaap_EnvironmentalRemediationContingencyAxis
= us-gaap_EnvironmentalIssueMember