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EQUITY AND STOCK-BASED COMPENSATION - Stock Options (Details) - USD ($)
$ / shares in Units, shares in Thousands
12 Months Ended
Jan. 02, 2015
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period of historical volatility   6 years  
Vesting period   3 years  
SPX stock options | Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options outstanding (in shares) 34    
Weighted-average exercise price per share (in dollars per share) $ 85.87    
Maximum contractual term 10 years    
Weighted-average grant-date fair value (in dollars per share) $ 27.06    
Period of historical volatility   7 years  
Vesting period   3 years  
SPX FLOW stock options | Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options outstanding (in shares)   342  
Weighted-average exercise price per share (in dollars per share)   $ 61.29  
Weighted-average grant-date fair value (in dollars per share)   $ 19.33  
Forfeitures (in shares)     29
Unrecognized compensation cost   $ 0