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REVENUES FROM CONTRACTS - Statement of Operations and Comprehensive Income (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Revenues $ 351.9 $ 340.6
Costs and expenses:    
Cost of products sold 261.8 252.5
Selling, general and administrative 68.6 68.3
Operating income 19.3 19.1
Income from continuing operations before income taxes 16.5 13.5
Income tax provision (4.1) (3.2)
Income from continuing operations 12.4 10.3
Net income 12.4 17.4
Comprehensive income $ 16.8 $ 16.4
Basic income per share of common stock:    
Income from continuing operations attributable to SPX Corporation common shareholders (in dollars per share) $ 0.29 $ 0.24
Net income per share attributable to SPX Corporation common shareholders (in dollars per share) 0.29 0.41
Diluted income per share of common stock:    
Income from continuing operations attributable to SPX Corporation common shareholders (in dollars per share) 0.28 0.24
Net income per share attributable to SPX Corporation common shareholders (in dollars per share) $ 0.28 $ 0.40
Calculated under Revenue Guidance in Effect before Topic 606    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Revenues $ 330.5  
Costs and expenses:    
Cost of products sold 243.0  
Selling, general and administrative 68.0  
Operating income 17.3  
Income from continuing operations before income taxes 14.5  
Income tax provision (3.6)  
Income from continuing operations 10.9  
Net income 10.9  
Comprehensive income $ 15.8  
Basic income per share of common stock:    
Income from continuing operations attributable to SPX Corporation common shareholders (in dollars per share) $ 0.25  
Net income per share attributable to SPX Corporation common shareholders (in dollars per share) 0.25  
Diluted income per share of common stock:    
Income from continuing operations attributable to SPX Corporation common shareholders (in dollars per share) 0.25  
Net income per share attributable to SPX Corporation common shareholders (in dollars per share) $ 0.25  
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Revenues $ (21.4)  
Costs and expenses:    
Cost of products sold (18.8)  
Selling, general and administrative (0.6)  
Operating income (2.0)  
Income from continuing operations before income taxes (2.0)  
Income tax provision 0.5  
Income from continuing operations (1.5)  
Net income (1.5)  
Comprehensive income $ (1.0)  
Basic income per share of common stock:    
Income from continuing operations attributable to SPX Corporation common shareholders (in dollars per share) $ (0.04)  
Net income per share attributable to SPX Corporation common shareholders (in dollars per share) (0.04)  
Diluted income per share of common stock:    
Income from continuing operations attributable to SPX Corporation common shareholders (in dollars per share) (0.03)  
Net income per share attributable to SPX Corporation common shareholders (in dollars per share) $ (0.03)