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Document and Entity Information (USD $)
12 Months Ended
Dec. 31, 2011
Feb. 21, 2012
Jul. 02, 2011
Document and Entity Information      
Entity Registrant Name SPX CORP    
Entity Central Index Key 0000088205    
Document Type 10-K    
Document Period End Date Dec. 31, 2011    
Amendment Flag true    
Amendment Description This Amendment No. 1 on Form 10-K/A amends our Annual Report on Form 10-K for the year ended December 31, 2011, originally filed with the Securities and Exchange Commission ("SEC") on February 24, 2012. This amendment includes revisions to the following Exhibits in Item 15: Exhibit 32.1, "Section 1350 Certifications" has been revised to reflect the date of our Annual Report on Form 10-K as "the year ended December 31, 2011." As a result of revising Exhibit 32.1, we are re-filing our Annual Report on Form 10-K for the year ended December 31, 2011 in its entirety. Since the date of the original filing of our Annual Report on Form 10-K for the year ended December 31, 2011, we filed, on May 2, 2012, our Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2012. Beginning with this quarterly report, we classified our Service Solutions business as a discontinued operation, which resulted in a change to our segment reporting structure. This Amendment No. 1 on Form 10-K/A revises Parts I and II of our Annual Report on Form 10-K for the year ended December 31, 2011 to primarily reflect (i) the Service Solutions business as a discontinued operation and (ii) the resulting changes to our segment reporting structure. Net income and net income attributable to SPX common shareholders have not changed from our Annual Report on Form 10-K for any of the years presented. Exhibit 99.1, "Report of Independent Registered Public Accounting Firm - KPMG LLP" has been revised to indicate that KPMG LLP performed its audits of EGS Electrical Group, LLC in accordance with the "standards of the Public Company Accounting Oversight Board (United States)." Other changes effected include the following: We have expanded (i) the long-term contract disclosures in Item 7 and (ii) the commitments and contingencies disclosures in Item 8 within this Amendment No. 1 on Form 10-K/A. As discussed in Note 3 to the consolidated financial statements included in this Form 10-K/A, in December 2010 the Financial Accounting Standards Board issued guidance to revise the presentation of comprehensive income by requiring entities to report components of comprehensive income in either a single continuous statement of comprehensive income or two separate but consecutive statements. This guidance is effective for the first financial reporting period in fiscal years beginning after December 15, 2011 and must be applied retrospectively for all periods presented in the financial statements. We have included Consolidated Statements of Comprehensive Income (Loss) for the years ended December 31, 2011, 2010 and 2009 on Page 50 of this Amendment No. 1 on Form 10-K/A in order to comply with the retrospective application of this guidance. This Amendment No. 1 on Form 10-K/A has not been updated for events occurring after the filing of the original Annual Report on Form 10-K on February 24, 2012, except to reflect the matters described above. Accordingly, this Amendment No. 1 on Form 10-K/A should be read in conjunction with our filings made with the SEC subsequent to the filing date of our original Annual Report on Form 10-K.    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 4,240,290,403
Entity Common Stock, Shares Outstanding   51,239,636  
Document Fiscal Year Focus 2011    
Document Fiscal Period Focus FY