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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2020
Feb. 19, 2021
Jun. 27, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
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 6325 Ardrey Kell Road Suite 400    
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    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 1,689,537,294
Entity Common Stock, Shares Outstanding   45,075,565  
Documents Incorporated by Reference Documents incorporated by reference: Portions of the Registrant’s proxy statement for its Annual Meeting to be held on May 11, 2021 are incorporated by reference into Part III of this Annual Report on Form 10-K.    
Entity Central Index Key 0000088205    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY