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Summarized Financial Information of Unconsolidated Affiliate Level 4 (Details) - HAI Results of Operation (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
HAI Summarized Financial Information [Line Items]    
Net sales $ 42msc_NetSalesOfUnconsolidatedAffiliate $ 45msc_NetSalesOfUnconsolidatedAffiliate
Gross Profit 17msc_GrossProfitOfUnconsolidatedAffiliate 11msc_GrossProfitOfUnconsolidatedAffiliate
Pre-tax income 10msc_PreTaxIncomeOfUnconsolidatedAffiliate 7msc_PreTaxIncomeOfUnconsolidatedAffiliate
Net Income $ 9msc_NetIncomeOfUnconsolidatedAffiliate $ 7msc_NetIncomeOfUnconsolidatedAffiliate