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EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Changes in Equity (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Jan. 01, 2019
Jan. 01, 2018
Changes in Equity        
Equity, beginning of period $ 414.9      
Net income (loss) (0.8) $ 12.4    
Equity, end of period 415.3      
Tax (provision) benefit (0.1) 0.4    
Tax benefit 0.2 4.9    
SPX Corporation Shareholders' Equity        
Changes in Equity        
Equity, beginning of period 414.9 314.7    
Net income (loss) (0.8) 12.4    
Net unrealized gains (losses) on qualifying cash flow hedges, net of tax (provision) benefit of $(0.1) and $0.4 for the three months ended March 30, 2019 and March 31, 2018, respectively 0.1 (0.5)    
Pension and postretirement liability adjustment, net of tax benefit of $0.2 and $4.9 for the three months ended March 30, 2019 and March 31, 2018, respectively (0.8) 3.9    
Foreign currency translation adjustments 2.4 1.0    
Total comprehensive income 0.9 16.8    
Stranded income tax effects resulting from tax reform 0.0 (4.8)    
Incentive plan activity 3.4 3.0    
Long-term incentive compensation expense 2.6 3.0    
Restricted stock and restricted stock unit vesting, net of tax withholdings (6.5) (3.3)    
Equity, end of period $ 415.3 $ 333.2    
Accounting Standards Update 2014-09 | SPX Corporation Shareholders' Equity        
Changes in Equity        
Cumulative effect of new accounting principle in period of adoption     $ 0.0 $ 4.0
Accounting Standards Update 2016-16 | SPX Corporation Shareholders' Equity        
Changes in Equity        
Cumulative effect of new accounting principle in period of adoption     $ 0.0 $ (0.2)