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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 07, 2020
Jun. 28, 2019
Cover page.      
Entity Central Index Key 0000088205    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 1-6948    
Entity Registrant Name SPX Corp    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 38-1016240    
Entity Address, Address Line One 13320-A Ballantyne Corporate Place    
Entity Address, City or Town Charlotte    
Entity Address, State or Province NC    
Entity Address, Postal Zip Code 28277    
City Area Code 980    
Local Phone Number 474-3700    
Title of 12(b) Security Common Stock, Par Value $0.01    
Trading Symbol SPXC    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 1,419,142,473
Entity Common Stock, Shares Outstanding   44,226,657  
Documents Incorporated by Reference Documents incorporated by reference: Portions of the Registrant’s proxy statement for its Annual Meeting to be held on May 14, 2020 are incorporated by reference into Part III of this Annual Report on Form 10-K.