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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
SIARP        
Employee Benefit Plans        
Percentage of projected benefit obligation   22.00%    
Lump sum payment in lieu of future pension benefit   $ 2.7    
Charge to net periodic pension benefit expense   (0.8)    
Postretirement Plans        
Net periodic pension/postretirement benefit expense        
Service cost $ 0.0 0.0 $ 0.0 $ 0.0
Interest cost 0.9 1.1 1.9 2.1
Amortization of unrecognized prior service credits (0.2) (0.2) (0.4) (0.4)
Net periodic pension benefit income 0.7 0.9 1.5 1.7
United States | Pension Plan        
Net periodic pension/postretirement benefit expense        
Service cost 0.1 0.1 0.2 0.2
Interest cost 3.3 3.5 6.6 7.1
Expected return on plan assets (2.5) (3.2) (5.0) (6.4)
Recognized net actuarial loss 0.0 1.8 0.0 1.8
Net periodic pension benefit income 0.9 $ 2.2 1.8 2.7
United States | Pension Plan | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | SPX Flow, Inc        
Employee Benefit Plans        
Percentage of projected benefit obligation   9.00%    
Lump sum payment in lieu of future pension benefit   $ 25.2    
Charge to net periodic pension benefit expense   (1.0)    
Foreign Plan | Pension Plan        
Net periodic pension/postretirement benefit expense        
Service cost 0.0 0.0 0.0 0.0
Interest cost 1.2 1.5 2.4 2.9
Expected return on plan assets (1.6) (1.8) (3.1) (3.5)
Net periodic pension benefit income $ (0.4) $ (0.3) $ (0.7) $ (0.6)